Exchanged old test files for the new testing code in was-v3.0.

5 files changed, 1484 insertions, 0 deletions

diff --git a/test/python/PyUnitTests.py b/test/python/PyUnitTests.py
new file mode 100755
index 00000000..3c19093f
--- /dev/null
+++ b/test/python/PyUnitTests.py
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+PYTHONPATH="%builddir%":"%srcdir%":$PYTHONPATH \
+DYLD_LIBRARY_PATH="%builddir%/.libs":"%builddir%/gdtoa/.libs":$DYLD_LIBRARY_PATH \
+    python "%srcdir%"/tests/python/UnitTests.py
diff --git a/test/python/UnitTests.py b/test/python/UnitTests.py
new file mode 100644
index 00000000..843e9fc1
--- /dev/null
+++ b/test/python/UnitTests.py
@@ -0,0 +1,9 @@
+from unittest import TextTestRunner, TestSuite
+
+import tests.python.numerics.t_amount as t_amount
+
+suites = [
+    t_amount.suite(),
+]
+
+TextTestRunner().run(TestSuite(suites))
diff --git a/test/python/__init__.py b/test/python/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/python/__init__.py
diff --git a/test/python/numerics/__init__.py b/test/python/numerics/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/python/numerics/__init__.py
diff --git a/test/python/numerics/t_amount.py b/test/python/numerics/t_amount.py
new file mode 100644
index 00000000..f7eeee8f
--- /dev/null
+++ b/test/python/numerics/t_amount.py
@@ -0,0 +1,1470 @@
+# -*- coding: utf-8 -*-
+
+import unittest
+import exceptions
+import operator
+
+from ledger import *
+from StringIO import *
+
+internalAmount = amount.exact
+
+class t_amountTestCase(unittest.TestCase):
+    testSession = None
+
+    def assertValid(self, amt):
+        self.assertTrue(amt.valid())
+
+    def setUp(self):
+        #self.testSession = session()
+        #set_session_context(self.testSession)
+
+        # Cause the display precision for dollars to be initialized to 2.
+        x1 = amount("$1.00")
+        self.assertTrue(x1)
+
+        #amount.stream_fullstrings = True # make reports from UnitTests accurate
+
+    def tearDown(self):
+        pass
+        #amount.stream_fullstrings = False
+
+        #set_session_context()
+        #self.testSession = None
+
+    def testParser(self):
+        x0 = amount()
+        x1 = amount()
+        x2 = amount()
+        x3 = amount()
+        x4 = amount(123.456)
+        x5 = amount(x4)
+        x6 = amount(x4)
+        x7 = amount(x4)
+        x8 = amount("$123.45")
+        x9 = amount(x8)
+        x10 = amount(x8)
+        x11 = amount(x8)
+        x12 = amount("$100")
+
+        self.assertEqual(2, x12.commodity.precision)
+
+        #buf = "$100..."
+        #input = StringIO(buf)
+        #x13 = amount()
+        #x13.parse(input)
+        #self.assertEqual(x12, x13)
+
+        x14 = amount()
+        self.assertRaises(exceptions.ArithmeticError, lambda: x14.parse("DM"))
+
+        x15 = amount("$1.000.000,00")
+
+        x16 = amount("$2000")
+        self.assertEqual("$2.000,00", x16.to_string())
+        x16.parse("$2000,00")
+        self.assertEqual("$2.000,00", x16.to_string())
+
+        # Since European-ness is an additive quality, we must switch back
+        # to American-ness manually
+        x15.commodity.drop_flags(COMMODITY_STYLE_EUROPEAN)
+
+        x17 = amount("$1,000,000.00")
+
+        x18 = amount("$2000")
+        self.assertEqual("$2,000.00", x18.to_string())
+        x18.parse("$2,000")
+        self.assertEqual("$2,000.00", x18.to_string())
+
+        self.assertEqual(x15, x17)
+
+        x19 = amount("EUR 1000")
+        x20 = amount("EUR 1000")
+
+        self.assertEqual("EUR 1000", x19.to_string())
+        self.assertEqual("EUR 1000", x20.to_string())
+
+        x1.parse("$100.0000", AMOUNT_PARSE_NO_MIGRATE)
+        self.assertEqual(2, x12.commodity.precision)
+        self.assertEqual(x1.commodity, x12.commodity)
+        self.assertEqual(x1, x12)
+
+        x0.parse("$100.0000")
+        self.assertEqual(4, x12.commodity.precision)
+        self.assertEqual(x0.commodity, x12.commodity)
+        self.assertEqual(x0, x12)
+
+        x2.parse("$100.00", AMOUNT_PARSE_NO_REDUCE)
+        self.assertEqual(x2, x12)
+        x3.parse("$100.00", AMOUNT_PARSE_NO_MIGRATE | AMOUNT_PARSE_NO_REDUCE)
+        self.assertEqual(x3, x12)
+
+        x4.parse("$100.00")
+        self.assertEqual(x4, x12)
+        x5.parse("$100.00", AMOUNT_PARSE_NO_MIGRATE)
+        self.assertEqual(x5, x12)
+        x6.parse("$100.00", AMOUNT_PARSE_NO_REDUCE)
+        self.assertEqual(x6, x12)
+        x7.parse("$100.00", AMOUNT_PARSE_NO_MIGRATE | AMOUNT_PARSE_NO_REDUCE)
+        self.assertEqual(x7, x12)
+
+        x8.parse("$100.00")
+        self.assertEqual(x8, x12)
+        x9.parse("$100.00", AMOUNT_PARSE_NO_MIGRATE)
+        self.assertEqual(x9, x12)
+        x10.parse("$100.00", AMOUNT_PARSE_NO_REDUCE)
+        self.assertEqual(x10, x12)
+        x11.parse("$100.00", AMOUNT_PARSE_NO_MIGRATE | AMOUNT_PARSE_NO_REDUCE)
+        self.assertEqual(x11, x12)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+        self.assertValid(x11)
+        self.assertValid(x12)
+
+    def testConstructors(self):
+        x0 = amount()
+        x1 = amount(123456)
+        x2 = amount(123456L)
+        x3 = amount(123.456)
+        x5 = amount("123456")
+        x6 = amount("123.456")
+        x7 = amount("123456")
+        x8 = amount("123.456")
+        x9 = amount(x3)
+        x10 = amount(x6)
+        x11 = amount(x8)
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: amount(0) == x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: amount() == x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: amount("0") == x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: amount("0.0") == x0)
+        self.assertEqual(x2, x1)
+        self.assertEqual(x5, x1)
+        self.assertEqual(x7, x1)
+        self.assertEqual(x6, x3)
+        self.assertEqual(x8, x3)
+        self.assertEqual(x10, x3)
+        self.assertEqual(x10, x9)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+        self.assertValid(x11)
+
+    def testCommodityConstructors(self):
+        x1 = amount("$123.45")
+        x2 = amount("-$123.45")
+        x3 = amount("$-123.45")
+        x4 = amount("DM 123.45")
+        x5 = amount("-DM 123.45")
+        x6 = amount("DM -123.45")
+        x7 = amount("123.45 euro")
+        x8 = amount("-123.45 euro")
+        x9 = amount("123.45€")
+        x10 = amount("-123.45€")
+
+        self.assertEqual(amount("$123.45"), x1)
+        self.assertEqual(amount("-$123.45"), x2)
+        self.assertEqual(amount("$-123.45"), x3)
+        self.assertEqual(amount("DM 123.45"), x4)
+        self.assertEqual(amount("-DM 123.45"), x5)
+        self.assertEqual(amount("DM -123.45"), x6)
+        self.assertEqual(amount("123.45 euro"), x7)
+        self.assertEqual(amount("-123.45 euro"), x8)
+        self.assertEqual(amount("123.45€"), x9)
+        self.assertEqual(amount("-123.45€"), x10)
+
+        self.assertEqual("$123.45", x1.to_string())
+        self.assertEqual("$-123.45", x2.to_string())
+        self.assertEqual("$-123.45", x3.to_string())
+        self.assertEqual("DM 123.45", x4.to_string())
+        self.assertEqual("DM -123.45", x5.to_string())
+        self.assertEqual("DM -123.45", x6.to_string())
+        self.assertEqual("123.45 euro", x7.to_string())
+        self.assertEqual("-123.45 euro", x8.to_string())
+        self.assertEqual("123.45€", x9.to_string())
+        self.assertEqual("-123.45€", x10.to_string())
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+
+    def testAssignment(self):
+        x0 = amount()
+        x1 = amount(123456)
+        x2 = amount(123456L)
+        x3 = amount(123.456)
+        x5 = amount("123456")
+        x6 = amount("123.456")
+        x7 = "123456"
+        x8 = "123.456"
+        x9 = amount(x3)
+        x10 = amount(x6)
+
+        self.assertEqual(x2, x1)
+        self.assertEqual(x5, x1)
+        self.assertEqual(x7, x1)
+        self.assertEqual(x6, x3)
+        self.assertEqual(x8, x3)
+        self.assertEqual(x10, x3)
+        self.assertEqual(x10, x9)
+
+        x1  = amount(123456)
+        x2  = amount(123456L)
+        x3  = amount(123.456)
+        x5  = amount("123456")
+        x6  = amount("123.456")
+        x7  = amount("123456")
+        x8  = amount("123.456")
+        x9  = x3
+        x10 = amount(x6)
+
+        self.assertEqual(x2, x1)
+        self.assertEqual(x5, x1)
+        self.assertEqual(x7, x1)
+        self.assertEqual(x6, x3)
+        self.assertEqual(x8, x3)
+        self.assertEqual(x10, x3)
+        self.assertEqual(x10, x9)
+
+        self.assertFalse(x1.is_null())
+        x1 = x0			# sets x1 back to uninitialized state
+        self.assertTrue(x0.is_null())
+        self.assertTrue(x1.is_null())
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+
+    def testCommodityAssignment(self):
+        x1 = amount("$123.45")
+        x2 = amount("-$123.45")
+        x3 = amount("$-123.45")
+        x4 = amount("DM 123.45")
+        x5 = amount("-DM 123.45")
+        x6 = amount("DM -123.45")
+        x7 = amount("123.45 euro")
+        x8 = amount("-123.45 euro")
+        x9 = amount("123.45€")
+        x10 = amount("-123.45€")
+
+        self.assertEqual(amount("$123.45"), x1)
+        self.assertEqual(amount("-$123.45"), x2)
+        self.assertEqual(amount("$-123.45"), x3)
+        self.assertEqual(amount("DM 123.45"), x4)
+        self.assertEqual(amount("-DM 123.45"), x5)
+        self.assertEqual(amount("DM -123.45"), x6)
+        self.assertEqual(amount("123.45 euro"), x7)
+        self.assertEqual(amount("-123.45 euro"), x8)
+        self.assertEqual(amount("123.45€"), x9)
+        self.assertEqual(amount("-123.45€"), x10)
+
+        self.assertEqual("$123.45", x1.to_string())
+        self.assertEqual("$-123.45", x2.to_string())
+        self.assertEqual("$-123.45", x3.to_string())
+        self.assertEqual("DM 123.45", x4.to_string())
+        self.assertEqual("DM -123.45", x5.to_string())
+        self.assertEqual("DM -123.45", x6.to_string())
+        self.assertEqual("123.45 euro", x7.to_string())
+        self.assertEqual("-123.45 euro", x8.to_string())
+        self.assertEqual("123.45€", x9.to_string())
+        self.assertEqual("-123.45€", x10.to_string())
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+
+    def testEquality(self):
+        x1 = amount(123456)
+        x2 = amount(456789)
+        x3 = amount(333333)
+        x4 = amount(123456.0)
+        x5 = amount("123456.0")
+        x6 = amount(123456.0)
+
+        self.assertTrue(x1 == 123456)
+        self.assertTrue(x1 != x2)
+        self.assertTrue(x1 == (x2 - x3))
+        self.assertTrue(x1 == x4)
+        self.assertTrue(x4 == x5)
+        self.assertTrue(x4 == x6)
+
+        self.assertTrue(x1 == 123456)
+        self.assertTrue(123456 == x1)
+        self.assertTrue(x1 == 123456L)
+        self.assertTrue(123456L == x1)
+        self.assertTrue(x1 == 123456.0)
+        self.assertTrue(123456.0 == x1)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+
+    def testCommodityEquality(self):
+        x0 = amount()
+        x1 = amount("$123.45")
+        x2 = amount("-$123.45")
+        x3 = amount("$-123.45")
+        x4 = amount("DM 123.45")
+        x5 = amount("-DM 123.45")
+        x6 = amount("DM -123.45")
+        x7 = amount("123.45 euro")
+        x8 = amount("-123.45 euro")
+        x9 = amount("123.45€")
+        x10 = amount("-123.45€")
+
+        self.assertTrue(x0.is_null())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.is_zero())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.is_realzero())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.sign() == 0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.compare(x1) < 0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.compare(x2) > 0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.compare(x0) == 0)
+
+        self.assertTrue(x1 != x2)
+        self.assertTrue(x1 != x4)
+        self.assertTrue(x1 != x7)
+        self.assertTrue(x1 != x9)
+        self.assertTrue(x2 == x3)
+        self.assertTrue(x4 != x5)
+        self.assertTrue(x5 == x6)
+        self.assertTrue(x7 == - x8)
+        self.assertTrue(x9 == - x10)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+
+    def testComparisons(self):
+        x0 = amount()
+        x1 = amount(-123)
+        x2 = amount(123)
+        x3 = amount(-123.45)
+        x4 = amount(123.45)
+        x5 = amount("-123.45")
+        x6 = amount("123.45")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 > x1)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 < x2)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 > x3)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 < x4)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 > x5)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 < x6)
+
+        self.assertTrue(x1 > x3)
+        self.assertTrue(x3 <= x5)
+        self.assertTrue(x3 >= x5)
+        self.assertTrue(x3 < x1)
+        self.assertTrue(x3 < x4)
+
+        self.assertTrue(x1 < 100)
+        self.assertTrue(100 > x1)
+        self.assertTrue(x1 < 100L)
+        self.assertTrue(100L > x1)
+        self.assertTrue(x1 < 100.0)
+        self.assertTrue(100.0 > x1)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+
+    def testCommodityComparisons(self):
+        x1 = amount("$-123")
+        x2 = amount("$123.00")
+        x3 = amount(internalAmount("$-123.4544"))
+        x4 = amount(internalAmount("$123.4544"))
+        x5 = amount("$-123.45")
+        x6 = amount("$123.45")
+        x7 = amount("DM 123.45")
+
+        self.assertTrue(x1 > x3)
+        self.assertTrue(x3 <= x5)
+        self.assertTrue(x3 < x5)
+        self.assertTrue(x3 <= x5)
+        self.assertFalse(x3 == x5)
+        self.assertTrue(x3 < x1)
+        self.assertTrue(x3 < x4)
+        self.assertFalse(x6 == x7)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x6 < x7)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+
+    def testIntegerAddition(self):
+        x0 = amount()
+        x1 = amount(123)
+        y1 = amount(456)
+
+        self.assertEqual(amount(579), x1 + y1)
+        self.assertEqual(amount(579), x1 + 456)
+        self.assertEqual(amount(579), 456 + x1)
+
+        x1 += amount(456)
+        self.assertEqual(amount(579), x1)
+        x1 += 456
+        self.assertEqual(amount(1035), x1)
+
+        x4 = amount("123456789123456789123456789")
+
+        self.assertEqual(amount("246913578246913578246913578"), x4 + x4)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x4)
+
+    def testFractionalAddition(self):
+        x1 = amount(123.123)
+        y1 = amount(456.456)
+
+        self.assertEqual(amount(579.579), x1 + y1)
+        self.assertEqual(amount(579.579), x1 + 456.456)
+        self.assertEqual(amount(579.579), 456.456 + x1)
+
+        x1 += amount(456.456)
+        self.assertEqual(amount(579.579), x1)
+        x1 += 456.456
+        self.assertEqual(amount(1036.035), x1)
+        x1 += 456
+        self.assertEqual(amount(1492.035), x1)
+
+        x2 = amount("123456789123456789.123456789123456789")
+
+        self.assertEqual(amount("246913578246913578.246913578246913578"), x2 + x2)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x2)
+
+    def testCommodityAddition(self):
+        x0 = amount()
+        x1 = amount("$123.45")
+        x2 = amount(internalAmount("$123.456789"))
+        x3 = amount("DM 123.45")
+        x4 = amount("123.45 euro")
+        x5 = amount("123.45€")
+        x6 = amount("123.45")
+
+        self.assertEqual(amount("$246.90"), x1 + x1)
+        self.assertNotEqual(amount("$246.91"), x1 + x2)
+        self.assertEqual(internalAmount("$246.906789"), x1 + x2)
+
+        # Converting to string drops internal precision
+        self.assertEqual("$246.90", (x1 + x1).to_string())
+        self.assertEqual("$246.91", (x1 + x2).to_string())
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 + x1)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 + x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + x3)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + x4)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + x5)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + x6)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + 123.45)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 + 123)
+
+        self.assertEqual(amount("DM 246.90"), x3 + x3)
+        self.assertEqual(amount("246.90 euro"), x4 + x4)
+        self.assertEqual(amount("246.90€"), x5 + x5)
+
+        self.assertEqual("DM 246.90", (x3 + x3).to_string())
+        self.assertEqual("246.90 euro", (x4 + x4).to_string())
+        self.assertEqual("246.90€", (x5 + x5).to_string())
+
+        x1 += amount("$456.45")
+        self.assertEqual(amount("$579.90"), x1)
+        x1 += amount("$456.45")
+        self.assertEqual(amount("$1036.35"), x1)
+        x1 += amount("$456")
+        self.assertEqual(amount("$1492.35"), x1)
+
+        x7 = amount(internalAmount("$123456789123456789.123456789123456789"))
+
+        self.assertEqual(internalAmount("$246913578246913578.246913578246913578"), x7 + x7)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+
+    def testIntegerSubtraction(self):
+        x1 = amount(123)
+        y1 = amount(456)
+
+        self.assertEqual(amount(333), y1 - x1)
+        self.assertEqual(amount(-333), x1 - y1)
+        self.assertEqual(amount(23), x1 - 100)
+        self.assertEqual(amount(-23), 100 - x1)
+
+        x1 -= amount(456)
+        self.assertEqual(amount(-333), x1)
+        x1 -= 456
+        self.assertEqual(amount(-789), x1)
+
+        x4 = amount("123456789123456789123456789")
+        y4 = amount("8238725986235986")
+
+        self.assertEqual(amount("123456789115218063137220803"), x4 - y4)
+        self.assertEqual(amount("-123456789115218063137220803"), y4 - x4)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x4)
+        self.assertValid(y4)
+
+    def testFractionalSubtraction(self):
+        x1 = amount(123.123)
+        y1 = amount(456.456)
+
+        self.assertEqual(amount(-333.333), x1 - y1)
+        self.assertEqual(amount(333.333), y1 - x1)
+
+        x1 -= amount(456.456)
+        self.assertEqual(amount(-333.333), x1)
+        x1 -= 456.456
+        self.assertEqual(amount(-789.789), x1)
+        x1 -= 456
+        self.assertEqual(amount(-1245.789), x1)
+
+        x2 = amount("123456789123456789.123456789123456789")
+        y2 = amount("9872345982459.248974239578")
+
+        self.assertEqual(amount("123446916777474329.874482549545456789"), x2 - y2)
+        self.assertEqual(amount("-123446916777474329.874482549545456789"), y2 - x2)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x2)
+        self.assertValid(y2)
+
+    def testCommoditySubtraction(self):
+        x0 = amount()
+        x1 = amount("$123.45")
+        x2 = amount(internalAmount("$123.456789"))
+        x3 = amount("DM 123.45")
+        x4 = amount("123.45 euro")
+        x5 = amount("123.45€")
+        x6 = amount("123.45")
+
+        self.assertNotEqual(amount(), x1 - x1)
+        self.assertEqual(amount("$0"), x1 - x1)
+        self.assertEqual(amount("$23.45"), x1 - amount("$100.00"))
+        self.assertEqual(amount("$-23.45"), amount("$100.00") - x1)
+        self.assertNotEqual(amount("$-0.01"), x1 - x2)
+        self.assertEqual(internalAmount("$-0.006789"), x1 - x2)
+
+        # Converting to string drops internal precision.  If an amount is
+        # zero, it drops the commodity as well.
+        self.assertEqual("$0.00", (x1 - x1).to_string())
+        self.assertEqual("$-0.01", (x1 - x2).to_string())
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 - x1)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 - x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - x3)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - x4)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - x5)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - x6)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - 123.45)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 - 123)
+
+        self.assertEqual(amount("DM 0.00"), x3 - x3)
+        self.assertEqual(amount("DM 23.45"), x3 - amount("DM 100.00"))
+        self.assertEqual(amount("DM -23.45"), amount("DM 100.00") - x3)
+        self.assertEqual(amount("0.00 euro"), x4 - x4)
+        self.assertEqual(amount("23.45 euro"), x4 - amount("100.00 euro"))
+        self.assertEqual(amount("-23.45 euro"), amount("100.00 euro") - x4)
+        self.assertEqual(amount("0.00€"), x5 - x5)
+        self.assertEqual(amount("23.45€"), x5 - amount("100.00€"))
+        self.assertEqual(amount("-23.45€"), amount("100.00€") - x5)
+
+        self.assertEqual("DM 0.00", (x3 - x3).to_string())
+        self.assertEqual("DM 23.45", (x3 - amount("DM 100.00")).to_string())
+        self.assertEqual("DM -23.45", (amount("DM 100.00") - x3).to_string())
+        self.assertEqual("0.00 euro", (x4 - x4).to_string())
+        self.assertEqual("23.45 euro", (x4 - amount("100.00 euro")).to_string())
+        self.assertEqual("-23.45 euro", (amount("100.00 euro") - x4).to_string())
+        self.assertEqual("0.00€", (x5 - x5).to_string())
+        self.assertEqual("23.45€", (x5 - amount("100.00€")).to_string())
+        self.assertEqual("-23.45€", (amount("100.00€") - x5).to_string())
+
+        x1 -= amount("$456.45")
+        self.assertEqual(amount("$-333.00"), x1)
+        x1 -= amount("$456.45")
+        self.assertEqual(amount("$-789.45"), x1)
+        x1 -= amount("$456")
+        self.assertEqual(amount("$-1245.45"), x1)
+
+        x7 = amount(internalAmount("$123456789123456789.123456789123456789"))
+        x8 = amount(internalAmount("$2354974984698.98459845984598"))
+
+        self.assertEqual(internalAmount("$123454434148472090.138858329277476789"), x7 - x8)
+        self.assertEqual("$123454434148472090.138858329277476789", (x7 - x8).to_string())
+        self.assertEqual("$123454434148472090.14",
+	      (amount("$1.00") * (x7 - x8)).to_string())
+        self.assertEqual(internalAmount("$-123454434148472090.138858329277476789"), x8 - x7)
+        self.assertEqual("$-123454434148472090.138858329277476789", (x8 - x7).to_string())
+        self.assertEqual("$-123454434148472090.14",
+	      (amount("$1.00") * (x8 - x7)).to_string())
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+
+    def testIntegerMultiplication(self):
+        x1 = amount(123)
+        y1 = amount(456)
+
+        self.assertEqual(amount(0), x1 * 0)
+        self.assertEqual(amount(0), amount(0) * x1)
+        self.assertEqual(amount(0), 0 * x1)
+        self.assertEqual(x1, x1 * 1)
+        self.assertEqual(x1, amount(1) * x1)
+        self.assertEqual(x1, 1 * x1)
+        self.assertEqual(- x1, x1 * -1)
+        self.assertEqual(- x1, amount(-1) * x1)
+        self.assertEqual(- x1, -1 * x1)
+        self.assertEqual(amount(56088), x1 * y1)
+        self.assertEqual(amount(56088), y1 * x1)
+        self.assertEqual(amount(56088), x1 * 456)
+        self.assertEqual(amount(56088), amount(456) * x1)
+        self.assertEqual(amount(56088), 456 * x1)
+
+        x1 *= amount(123)
+        self.assertEqual(amount(15129), x1)
+        x1 *= 123
+        self.assertEqual(amount(1860867), x1)
+
+        x4 = amount("123456789123456789123456789")
+
+        self.assertEqual(amount("15241578780673678546105778281054720515622620750190521"),
+	      x4 * x4)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x4)
+
+    def testFractionalMultiplication(self):
+        x1 = amount(123.123)
+        y1 = amount(456.456)
+
+        self.assertEqual(amount(0), x1 * 0)
+        self.assertEqual(amount(0), amount(0) * x1)
+        self.assertEqual(amount(0), 0 * x1)
+        self.assertEqual(x1, x1 * 1)
+        self.assertEqual(x1, amount(1) * x1)
+        self.assertEqual(x1, 1 * x1)
+        self.assertEqual(- x1, x1 * -1)
+        self.assertEqual(- x1, amount(-1) * x1)
+        self.assertEqual(- x1, -1 * x1)
+        self.assertEqual(amount("56200.232088"), x1 * y1)
+        self.assertEqual(amount("56200.232088"), y1 * x1)
+        self.assertEqual(amount("56200.232088"), x1 * 456.456)
+        self.assertEqual(amount("56200.232088"), amount(456.456) * x1)
+        self.assertEqual(amount("56200.232088"), 456.456 * x1)
+
+        x1 *= amount(123.123)
+        self.assertEqual(amount("15159.273129"), x1)
+        x1 *= 123.123
+        self.assertEqual(amount("1866455.185461867"), x1)
+        x1 *= 123
+        self.assertEqual(amount("229573987.811809641"), x1)
+
+        x2 = amount("123456789123456789.123456789123456789")
+
+        self.assertEqual(amount("15241578780673678546105778311537878.046486820281054720515622620750190521"),
+	      x2 * x2)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x2)
+
+    def testCommodityMultiplication(self):
+        x0 = amount()
+        x1 = amount("$123.12")
+        y1 = amount("$456.45")
+        x2 = amount(internalAmount("$123.456789"))
+        x3 = amount("DM 123.45")
+        x4 = amount("123.45 euro")
+        x5 = amount("123.45€")
+
+        self.assertEqual(amount("$0.00"), x1 * 0)
+        self.assertEqual(amount("$0.00"), 0 * x1)
+        self.assertEqual(x1, x1 * 1)
+        self.assertEqual(x1, 1 * x1)
+        self.assertEqual(- x1, x1 * -1)
+        self.assertEqual(- x1, -1 * x1)
+        self.assertEqual(internalAmount("$56198.124"), x1 * y1)
+        self.assertEqual("$56198.12", (x1 * y1).to_string())
+        self.assertEqual(internalAmount("$56198.124"), y1 * x1)
+        self.assertEqual("$56198.12", (y1 * x1).to_string())
+
+        # Internal amounts retain their precision, even when being
+        # converted to strings
+        self.assertEqual(internalAmount("$15199.99986168"), x1 * x2)
+        self.assertEqual(internalAmount("$15199.99986168"), x2 * x1)
+        self.assertEqual("$15200.00", (x1 * x2).to_string())
+        self.assertEqual("$15199.99986168", (x2 * x1).to_string())
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 * x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 * x1)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 * x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 * x3)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 * x4)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 * x5)
+
+        x1 *= amount("123.12")
+        self.assertEqual(internalAmount("$15158.5344"), x1)
+        self.assertEqual("$15158.53", x1.to_string())
+        x1 *= 123.12
+        self.assertEqual(internalAmount("$1866318.755328"), x1)
+        self.assertEqual("$1866318.76", x1.to_string())
+        x1 *= 123
+        self.assertEqual(internalAmount("$229557206.905344"), x1)
+        self.assertEqual("$229557206.91", x1.to_string())
+
+        x7 = amount(internalAmount("$123456789123456789.123456789123456789"))
+
+        self.assertEqual(internalAmount("$15241578780673678546105778311537878.046486820281054720515622620750190521"),
+	      x7 * x7)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x7)
+
+    def testIntegerDivision(self):
+        x1 = amount(123)
+        y1 = amount(456)
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / 0)
+        self.assertEqual(amount(0), amount(0) / x1)
+        self.assertEqual(amount(0), 0 / x1)
+        self.assertEqual(x1, x1 / 1)
+        self.assertEqual(amount("0.008130"), amount(1) / x1)
+        self.assertEqual(amount("0.008130"), 1 / x1)
+        self.assertEqual(- x1, x1 / -1)
+        self.assertEqual(- amount("0.008130"), amount(-1) / x1)
+        self.assertEqual(- amount("0.008130"), -1 / x1)
+        self.assertEqual(amount("0.269737"), x1 / y1)
+        self.assertEqual(amount("3.707317"), y1 / x1)
+        self.assertEqual(amount("0.269737"), x1 / 456)
+        self.assertEqual(amount("3.707317"), amount(456) / x1)
+        self.assertEqual(amount("3.707317"), 456 / x1)
+
+        x1 /= amount(456)
+        self.assertEqual(amount("0.269737"), x1)
+        x1 /= 456
+        self.assertEqual(amount("0.00059152850877193"), x1)
+
+        x4 = amount("123456789123456789123456789")
+        y4 = amount("56")
+
+        self.assertEqual(amount(1), x4 / x4)
+        self.assertEqual(amount("2204585520061728377204585.517857"), x4 / y4)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x4)
+        self.assertValid(y4)
+
+    def testFractionalDivision(self):
+        x1 = amount(123.123)
+        y1 = amount(456.456)
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / 0)
+        self.assertEqual(amount("0.008121959"), amount(1.0) / x1)
+        self.assertEqual(amount("0.008121959"), 1.0 / x1)
+        self.assertEqual(x1, x1 / 1.0)
+        self.assertEqual(amount("0.008121959"), amount(1.0) / x1)
+        self.assertEqual(amount("0.008121959"), 1.0 / x1)
+        self.assertEqual(- x1, x1 / -1.0)
+        self.assertEqual(- amount("0.008121959"), amount(-1.0) / x1)
+        self.assertEqual(- amount("0.008121959"), -1.0 / x1)
+        self.assertEqual(amount("0.269736842105263"), x1 / y1)
+        self.assertEqual(amount("3.707317073170732"), y1 / x1)
+        self.assertEqual(amount("0.269736842105263"), x1 / 456.456)
+        self.assertEqual(amount("3.707317073170732"), amount(456.456) / x1)
+        self.assertEqual(amount("3.707317073170732"), 456.456 / x1)
+
+        x1 /= amount(456.456)
+        self.assertEqual(amount("0.269736842105263"), x1)
+        x1 /= 456.456
+        self.assertEqual(amount("0.000590937225286255411255411255411255411"), x1)
+        x1 /= 456
+        self.assertEqual(amount("0.000001295914967733016252753094858358016252192982456140350877192982456140350877192982"), x1)
+
+        x4 = amount("1234567891234567.89123456789")
+        y4 = amount("56.789")
+
+        self.assertEqual(amount(1.0), x4 / x4)
+        self.assertEqual(amount("21739560323910.7554497273748437197344556164046"), x4 / y4)
+
+        self.assertValid(x1)
+        self.assertValid(y1)
+        self.assertValid(x4)
+        self.assertValid(y4)
+
+    def testCommodityDivision(self):
+        x0 = amount()
+        x1 = amount("$123.12")
+        y1 = amount("$456.45")
+        x2 = amount(internalAmount("$123.456789"))
+        x3 = amount("DM 123.45")
+        x4 = amount("123.45 euro")
+        x5 = amount("123.45€")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / 0)
+        self.assertEqual(amount("$0.00"), 0 / x1)
+        self.assertEqual(x1, x1 / 1)
+        self.assertEqual(internalAmount("$0.00812216"), 1 / x1)
+        self.assertEqual(- x1, x1 / -1)
+        self.assertEqual(internalAmount("$-0.00812216"), -1 / x1)
+        self.assertEqual(internalAmount("$0.26973382"), x1 / y1)
+        self.assertEqual("$0.27", (x1 / y1).to_string())
+        self.assertEqual(internalAmount("$3.70735867"), y1 / x1)
+        self.assertEqual("$3.71", (y1 / x1).to_string())
+
+        # Internal amounts retain their precision, even when being
+        # converted to strings
+        self.assertEqual(internalAmount("$0.99727201"), x1 / x2)
+        self.assertEqual(internalAmount("$1.00273545321637426901"), x2 / x1)
+        self.assertEqual("$1.00", (x1 / x2).to_string())
+        self.assertEqual("$1.00273545321637426901", (x2 / x1).to_string())
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 / x1)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0 / x0)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / x3)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / x4)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1 / x5)
+
+        x1 /= amount("123.12")
+        self.assertEqual(internalAmount("$1.00"), x1)
+        self.assertEqual("$1.00", x1.to_string())
+        x1 /= 123.12
+        self.assertEqual(internalAmount("$0.00812216"), x1)
+        self.assertEqual("$0.01", x1.to_string())
+        x1 /= 123
+        self.assertEqual(internalAmount("$0.00006603"), x1)
+        self.assertEqual("$0.00", x1.to_string())
+
+        x6 = amount(internalAmount("$237235987235987.98723987235978"))
+        x7 = amount(internalAmount("$123456789123456789.123456789123456789"))
+
+        self.assertEqual(amount("$1"), x7 / x7)
+        self.assertEqual(internalAmount("$0.0019216115121765559608381226612019501046413574469262"),
+	      x6 / x7)
+        self.assertEqual(internalAmount("$520.39654928343335571379527154924040947271699678158689736256"),
+	      x7 / x6)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+
+    def testNegation(self):
+        x0 = amount()
+        x1 = amount(-123456)
+        x3 = amount(-123.456)
+        x5 = amount("-123456")
+        x6 = amount("-123.456")
+        x7 = amount("-123456")
+        x8 = amount("-123.456")
+        x9 = amount(- x3)
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.negate())
+        self.assertEqual(x5, x1)
+        self.assertEqual(x7, x1)
+        self.assertEqual(x6, x3)
+        self.assertEqual(x8, x3)
+        self.assertEqual(- x6, x9)
+        self.assertEqual(x3.negate(), x9)
+
+        x10 = amount(x9.negate())
+
+        self.assertEqual(x3, x10)
+
+        self.assertValid(x1)
+        self.assertValid(x3)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+
+    def testCommodityNegation(self):
+        x1 = amount("$123.45")
+        x2 = amount("-$123.45")
+        x3 = amount("$-123.45")
+        x4 = amount("DM 123.45")
+        x5 = amount("-DM 123.45")
+        x6 = amount("DM -123.45")
+        x7 = amount("123.45 euro")
+        x8 = amount("-123.45 euro")
+        x9 = amount("123.45€")
+        x10 = amount("-123.45€")
+
+        self.assertEqual(amount("$-123.45"), - x1)
+        self.assertEqual(amount("$123.45"), - x2)
+        self.assertEqual(amount("$123.45"), - x3)
+        self.assertEqual(amount("DM -123.45"), - x4)
+        self.assertEqual(amount("DM 123.45"), - x5)
+        self.assertEqual(amount("DM 123.45"), - x6)
+        self.assertEqual(amount("-123.45 euro"), - x7)
+        self.assertEqual(amount("123.45 euro"), - x8)
+        self.assertEqual(amount("-123.45€"), - x9)
+        self.assertEqual(amount("123.45€"), - x10)
+
+        self.assertEqual(amount("$-123.45"), x1.negate())
+        self.assertEqual(amount("$123.45"), x2.negate())
+        self.assertEqual(amount("$123.45"), x3.negate())
+
+        self.assertEqual("$-123.45", (- x1).to_string())
+        self.assertEqual("$123.45", (- x2).to_string())
+        self.assertEqual("$123.45", (- x3).to_string())
+        self.assertEqual("DM -123.45", (- x4).to_string())
+        self.assertEqual("DM 123.45", (- x5).to_string())
+        self.assertEqual("DM 123.45", (- x6).to_string())
+        self.assertEqual("-123.45 euro", (- x7).to_string())
+        self.assertEqual("123.45 euro", (- x8).to_string())
+        self.assertEqual("-123.45€", (- x9).to_string())
+        self.assertEqual("123.45€", (- x10).to_string())
+
+        self.assertEqual(amount("$-123.45"), x1.negate())
+        self.assertEqual(amount("$123.45"), x2.negate())
+        self.assertEqual(amount("$123.45"), x3.negate())
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+        self.assertValid(x6)
+        self.assertValid(x7)
+        self.assertValid(x8)
+        self.assertValid(x9)
+        self.assertValid(x10)
+
+    def testAbs(self):
+        x0 = amount()
+        x1 = amount(-1234)
+        x2 = amount(1234)
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.abs())
+        self.assertEqual(amount(1234), x1.abs())
+        self.assertEqual(amount(1234), x2.abs())
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+
+    def testCommodityAbs(self):
+        x1 = amount("$-1234.56")
+        x2 = amount("$1234.56")
+
+        self.assertEqual(amount("$1234.56"), x1.abs())
+        self.assertEqual(amount("$1234.56"), x2.abs())
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+
+    def testFractionalRound(self):
+        x0 = amount()
+        x1 = amount("1234.567890")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.precision)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.round())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.round(2))
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.unround())
+        self.assertEqual(6, x1.precision)
+
+        x1b = amount(x1.unround())
+
+        self.assertEqual(x1b.precision, x1b.unround().precision)
+
+        y7 = amount(x1.round(7))
+        y6 = amount(x1.round(6))
+        y5 = amount(x1.round(5))
+        y4 = amount(x1.round(4))
+        y3 = amount(x1.round(3))
+        y2 = amount(x1.round(2))
+        y1 = amount(x1.round(1))
+        y0 = amount(x1.round(0))
+
+        self.assertEqual(6, y7.precision)
+        self.assertEqual(6, y6.precision)
+        self.assertEqual(5, y5.precision)
+        self.assertEqual(4, y4.precision)
+        self.assertEqual(3, y3.precision)
+        self.assertEqual(2, y2.precision)
+        self.assertEqual(1, y1.precision)
+        self.assertEqual(0, y0.precision)
+
+        self.assertEqual(amount("1234.56789"), y7)
+        self.assertEqual(amount("1234.56789"), y6)
+        self.assertEqual(amount("1234.56789"), y5)
+        self.assertEqual(amount("1234.5679"), y4)
+        self.assertEqual(amount("1234.568"), y3)
+        self.assertEqual(amount("1234.57"), y2)
+        self.assertEqual(amount("1234.6"), y1)
+        self.assertEqual(amount("1235"), y0)
+
+        x2 = amount("9876.543210")
+
+        self.assertEqual(amount("9876.543210"), x2.round(6))
+        self.assertEqual(amount("9876.54321"), x2.round(5))
+        self.assertEqual(amount("9876.5432"), x2.round(4))
+        self.assertEqual(amount("9876.543"), x2.round(3))
+        self.assertEqual(amount("9876.54"), x2.round(2))
+        self.assertEqual(amount("9876.5"), x2.round(1))
+        self.assertEqual(amount("9877"), x2.round(0))
+
+        x3 = amount("-1234.567890")
+
+        self.assertEqual(amount("-1234.56789"), x3.round(6))
+        self.assertEqual(amount("-1234.56789"), x3.round(5))
+        self.assertEqual(amount("-1234.5679"), x3.round(4))
+        self.assertEqual(amount("-1234.568"), x3.round(3))
+        self.assertEqual(amount("-1234.57"), x3.round(2))
+        self.assertEqual(amount("-1234.6"), x3.round(1))
+        self.assertEqual(amount("-1235"), x3.round(0))
+
+        x4 = amount("-9876.543210")
+
+        self.assertEqual(amount("-9876.543210"), x4.round(6))
+        self.assertEqual(amount("-9876.54321"), x4.round(5))
+        self.assertEqual(amount("-9876.5432"), x4.round(4))
+        self.assertEqual(amount("-9876.543"), x4.round(3))
+        self.assertEqual(amount("-9876.54"), x4.round(2))
+        self.assertEqual(amount("-9876.5"), x4.round(1))
+        self.assertEqual(amount("-9877"), x4.round(0))
+
+        x5 = amount("0.0000000000000000000000000000000000001")
+
+        self.assertEqual(amount("0.0000000000000000000000000000000000001"),
+	      x5.round(37))
+        self.assertEqual(amount(0), x5.round(36))
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+
+    def testCommodityRound(self):
+        x1 = amount(internalAmount("$1234.567890"))
+
+        self.assertEqual(internalAmount("$1234.56789"), x1.round(6))
+        self.assertEqual(internalAmount("$1234.56789"), x1.round(5))
+        self.assertEqual(internalAmount("$1234.5679"), x1.round(4))
+        self.assertEqual(internalAmount("$1234.568"), x1.round(3))
+        self.assertEqual(amount("$1234.57"), x1.round(2))
+        self.assertEqual(amount("$1234.6"), x1.round(1))
+        self.assertEqual(amount("$1235"), x1.round(0))
+
+        x2 = amount(internalAmount("$9876.543210"))
+
+        self.assertEqual(internalAmount("$9876.543210"), x2.round(6))
+        self.assertEqual(internalAmount("$9876.54321"), x2.round(5))
+        self.assertEqual(internalAmount("$9876.5432"), x2.round(4))
+        self.assertEqual(internalAmount("$9876.543"), x2.round(3))
+        self.assertEqual(amount("$9876.54"), x2.round(2))
+        self.assertEqual(amount("$9876.5"), x2.round(1))
+        self.assertEqual(amount("$9877"), x2.round(0))
+
+        x3 = amount(internalAmount("$-1234.567890"))
+
+        self.assertEqual(internalAmount("$-1234.56789"), x3.round(6))
+        self.assertEqual(internalAmount("$-1234.56789"), x3.round(5))
+        self.assertEqual(internalAmount("$-1234.5679"), x3.round(4))
+        self.assertEqual(internalAmount("$-1234.568"), x3.round(3))
+        self.assertEqual(amount("$-1234.57"), x3.round(2))
+        self.assertEqual(amount("$-1234.6"), x3.round(1))
+        self.assertEqual(amount("$-1235"), x3.round(0))
+
+        x4 = amount(internalAmount("$-9876.543210"))
+
+        self.assertEqual(internalAmount("$-9876.543210"), x4.round(6))
+        self.assertEqual(internalAmount("$-9876.54321"), x4.round(5))
+        self.assertEqual(internalAmount("$-9876.5432"), x4.round(4))
+        self.assertEqual(internalAmount("$-9876.543"), x4.round(3))
+        self.assertEqual(amount("$-9876.54"), x4.round(2))
+        self.assertEqual(amount("$-9876.5"), x4.round(1))
+        self.assertEqual(amount("$-9877"), x4.round(0))
+
+        x5 = amount("$123.45")
+
+        x5 *= 100.12
+
+        self.assertEqual(internalAmount("$12359.814"), x5)
+        self.assertEqual("$12359.81", x5.to_string())
+        self.assertEqual("$12359.814", x5.to_fullstring())
+        self.assertEqual("$12359.814", x5.unround().to_string())
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+        self.assertValid(x5)
+
+    def testCommodityDisplayRound(self):
+        x1 = amount("$0.85")
+        x2 = amount("$0.1")
+
+        x1 *= 0.19
+
+        self.assertNotEqual(amount("$0.16"), x1)
+        self.assertEqual(internalAmount("$0.1615"), x1)
+        self.assertEqual("$0.16", x1.to_string())
+
+        self.assertEqual(amount("$0.10"), x2)
+        self.assertNotEqual(internalAmount("$0.101"), x2)
+        self.assertEqual("$0.10", x2.to_string())
+
+        x1 *= 7
+
+        self.assertNotEqual(amount("$1.13"), x1)
+        self.assertEqual(internalAmount("$1.1305"), x1)
+        self.assertEqual("$1.13", x1.to_string())
+
+    def testReduction(self):
+        x0 = amount()
+        x1 = amount("60s")
+        x2 = amount("600s")
+        x3 = amount("6000s")
+        x4 = amount("360000s")
+        x5 = amount("10m")
+        x6 = amount("100m")
+        x7 = amount("1000m")
+        x8 = amount("10000m")
+        x9 = amount("10h")
+        x10 = amount("100h")
+        x11 = amount("1000h")
+        x12 = amount("10000h")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.reduce())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.unreduce())
+        self.assertEqual(x2, x5)
+        self.assertEqual(x3, x6)
+        self.assertEqual(x4, x10)
+        self.assertEqual("100.0h", x4.unreduce().to_string())
+
+    def testSign(self):
+        x0 = amount()
+        x1 = amount("0.0000000000000000000000000000000000001")
+        x2 = amount("-0.0000000000000000000000000000000000001")
+        x3 = amount("1")
+        x4 = amount("-1")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.sign())
+        self.assertTrue(x1.sign() > 0)
+        self.assertTrue(x2.sign() < 0)
+        self.assertTrue(x3.sign() > 0)
+        self.assertTrue(x4.sign() < 0)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+
+    def testCommoditySign(self):
+        x1 = amount(internalAmount("$0.0000000000000000000000000000000000001"))
+        x2 = amount(internalAmount("$-0.0000000000000000000000000000000000001"))
+        x3 = amount("$1")
+        x4 = amount("$-1")
+
+        self.assertTrue(x1.sign() != 0)
+        self.assertTrue(x2.sign() != 0)
+        self.assertTrue(x3.sign() > 0)
+        self.assertTrue(x4.sign() < 0)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+        self.assertValid(x3)
+        self.assertValid(x4)
+
+    def testTruth(self):
+        x0 = amount()
+        x1 = amount("1234")
+        x2 = amount("1234.56")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: 1 if x0 else 0)
+
+        self.assertTrue(x1)
+        self.assertTrue(x2)
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+        self.assertValid(x2)
+
+    def testCommodityTruth(self):
+        x1 = amount("$1234")
+        x2 = amount("$1234.56")
+
+        if x1:
+          self.assertTrue(True)
+        else:
+          self.assertTrue(False)
+
+        if x2:
+          self.assertTrue(True)
+        else:
+          self.assertTrue(False)
+
+        self.assertValid(x1)
+        self.assertValid(x2)
+
+    def testForZero(self):
+        x0 = amount()
+        x1 = amount("0.000000000000000000001")
+
+        self.assertTrue(x1)
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.is_zero())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.is_realzero())
+        self.assertFalse(x1.is_zero())
+        self.assertFalse(x1.is_realzero())
+
+        self.assertValid(x0)
+        self.assertValid(x1)
+
+    def testCommodityForZero(self):
+        x1 = amount(internalAmount("$0.000000000000000000001"))
+
+        self.assertFalse(x1)
+        self.assertTrue(x1.is_zero())
+        self.assertFalse(x1.is_realzero())
+
+        self.assertValid(x1)
+
+    def testIntegerConversion(self):
+        x0 = amount()
+        x1 = amount(123456)
+        x2 = amount("12345682348723487324")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.to_long())
+        self.assertRaises(exceptions.ArithmeticError, lambda: x0.to_double())
+        self.assertFalse(x2.fits_in_long())
+        self.assertEqual(123456, x1.to_long())
+        self.assertEqual(123456.0, x1.to_double())
+        self.assertEqual("123456", x1.to_string())
+        self.assertEqual("123456", x1.quantity_string)
+
+        self.assertValid(x1)
+
+    def testFractionalConversion(self):
+        x1 = amount(1234.56)
+        x2 = amount("1234.5683787634678348734")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1.to_long()) # loses precision
+        self.assertRaises(exceptions.ArithmeticError, lambda: x2.to_double()) # loses precision
+        self.assertFalse(x2.fits_in_double())
+        self.assertEqual(1234, x1.to_long(True))
+        self.assertEqual(1234.56, x1.to_double())
+        self.assertEqual("1234.56", x1.to_string())
+        self.assertEqual("1234.56", x1.quantity_string)
+
+        self.assertValid(x1)
+
+    def testCommodityConversion(self):
+        x1 = amount("$1234.56")
+
+        self.assertRaises(exceptions.ArithmeticError, lambda: x1.to_long()) # loses precision
+        self.assertEqual(1234, x1.to_long(True))
+        self.assertEqual(1234.56, x1.to_double())
+        self.assertEqual("$1234.56", x1.to_string())
+        self.assertEqual("1234.56", x1.quantity_string)
+
+        self.assertValid(x1)
+
+    def testPrinting(self):
+        pass
+        #x0 = amount()
+        #x1 = amount("982340823.380238098235098235098235098")
+        #
+        #bufstr = StringIO()
+        #self.assertRaises(exceptions.ArithmeticError, lambda: bufstr.write(x0))
+        #
+        #bufstr = StringIO()
+        #bufstr.write(x1)
+        #
+        #self.assertEqual("982340823.380238098235098235098235098",
+        #                 bufstr.getvalue())
+        #
+        #self.assertValid(x0)
+        #self.assertValid(x1)
+
+    def testCommodityPrinting(self):
+        pass
+        #x1 = amount(internalAmount("$982340823.386238098235098235098235098"))
+        #x2 = amount("$982340823.38")
+        #
+        #bufstr = StringIO()
+        #bufstr.write(x1)
+        #
+        #self.assertEqual("$982340823.386238098235098235098235098",
+        #                 bufstr.getvalue())
+        #
+        #bufstr = StringIO()
+        #bufstr.write((x1 * x2).to_string())
+        #
+        #self.assertEqual("$964993493285024293.18099172508158508135413499124",
+        #                 bufstr.getvalue())
+        #
+        #bufstr = StringIO()
+        #bufstr.write((x2 * x1).to_string())
+        #
+        #self.assertEqual("$964993493285024293.18", bufstr.getvalue())
+        #
+        #self.assertValid(x1)
+        #self.assertValid(x2)
+
+    def testSerialization(self):
+        pass
+        #x0 = amount()
+        #x1 = amount("$8,192.34")
+        #x2 = amount("8192.34")
+        #x3 = amount("8192.34")
+        #x4 = amount("-8192.34")
+        #x5 = amount(x4)
+        #
+        ## Force x3's pointer to actually be set to null_commodity
+        ##x3.set_commodity(*x3.current_pool.null_commodity)
+        #
+        #buf = ""
+        #storage = StringIO()
+        #self.assertRaises(exceptions.ArithmeticError, lambda: x0.write(storage))
+        #x1.write(storage)
+        #x2.write(storage)
+        #x3.write(storage)
+        #x4.write(storage)
+        #x5.write(storage)
+        #buf = storage.getvalue()
+        #
+        #x1b = amount()
+        #x2b = amount()
+        #x3b = amount()
+        #x4b = amount()
+        #x5b = amount()
+        #
+        #storage = StringIO(buf)
+        #x1b.read(storage)
+        #x2b.read(storage)
+        #x3b.read(storage)
+        #x4b.read(storage)
+        #x5b.read(storage)
+        #
+        #self.assertEqual(x1, x1b)
+        #self.assertEqual(x2, x2b)
+        #self.assertEqual(x3, x3b)
+        #self.assertEqual(x4, x4b)
+        #
+        #ptr = buf.c_str()
+        #
+        #x1c = amount()
+        #x2c = amount()
+        #x3c = amount()
+        #x4c = amount()
+        #x5c = amount()
+        #
+        #x1c.read(ptr)
+        #x2c.read(ptr)
+        #x3c.read(ptr)
+        #x4c.read(ptr)
+        #x5c.read(ptr)
+        #
+        #self.assertEqual(x1, x1b)
+        #self.assertEqual(x2, x2b)
+        #self.assertEqual(x3, x3b)
+        #self.assertEqual(x4, x4b)
+        #
+        #self.assertValid(x1)
+        #self.assertValid(x2)
+        #self.assertValid(x3)
+        #self.assertValid(x4)
+        #self.assertValid(x1b)
+        #self.assertValid(x2b)
+        #self.assertValid(x3b)
+        #self.assertValid(x4b)
+        #self.assertValid(x1c)
+        #self.assertValid(x2c)
+        #self.assertValid(x3c)
+        #self.assertValid(x4c)
+
+ 
+def suite():
+    return unittest.TestLoader().loadTestsFromTestCase(t_amountTestCase)
+
+if __name__ == '__main__':
+    unittest.main()