1 files changed, 77 insertions, 0 deletions
diff --git a/lib/utfcpp/v4/tests/test_cpp20.cpp b/lib/utfcpp/v4/tests/test_cpp20.cpp
new file mode 100644
index 00000000..50dbe30a
--- /dev/null
+++ b/lib/utfcpp/v4/tests/test_cpp20.cpp
@@ -0,0 +1,77 @@
+#include "../extern/ftest/ftest.h"
+#define UTF_CPP_CPLUSPLUS 202002L
+#include "utf8.h"
+#include <string>
+using namespace utf8;
+using namespace std;
+
+TEST(CPP20APITests, test_utf16tou8)
+{
+    u16string utf16string = {0x41, 0x0448, 0x65e5, 0xd834, 0xdd1e};
+    u16string_view utf16stringview{utf16string};
+    u8string u = utf16tou8(utf16string);
+    EXPECT_EQ (u.size(), 10);
+    u = utf16tou8(utf16stringview);
+    EXPECT_EQ (u.size(), 10);
+}
+
+TEST(CPP20APITests, tes20t_utf8to16)
+{
+    u8string utf8_with_surrogates{u8"\xe6\x97\xa5\xd1\x88\xf0\x9d\x84\x9e"};
+    u16string utf16result = utf8to16(utf8_with_surrogates);
+    EXPECT_EQ (utf16result.size(), 4);
+    EXPECT_EQ (utf16result[2], 0xd834);
+    EXPECT_EQ (utf16result[3], 0xdd1e);
+}
+
+TEST(CPP20APITests, test_utf32tou8)
+{
+    u32string utf32string = {0x448, 0x65E5, 0x10346};
+    u32string_view utf32stringview{utf32string};
+    u8string utf8result = utf32tou8(utf32stringview);
+    EXPECT_EQ (utf8result.size(), 9);
+}
+
+TEST(CPP20APITests, test_utf8to32)
+{
+    u8string twochars = u8"\xe6\x97\xa5\xd1\x88";
+    u32string utf32result = utf8to32(twochars);
+    EXPECT_EQ (utf32result.size(), 2);
+}
+
+TEST(CPP20APITests, test_find_invalid)
+{
+    u8string utf_invalid = u8"\xe6\x97\xa5\xd1\x88\xfa";
+    auto invalid = find_invalid(utf_invalid);
+    EXPECT_EQ (invalid, 5);
+}
+
+TEST(CPP20APITests, test_is_valid)
+{
+    u8string utf_invalid = u8"\xe6\x97\xa5\xd1\x88\xfa";
+    bool bvalid = is_valid(utf_invalid);
+    EXPECT_FALSE (bvalid);
+    u8string utf8_with_surrogates = u8"\xe6\x97\xa5\xd1\x88\xf0\x9d\x84\x9e";
+    bvalid = is_valid(utf8_with_surrogates);
+    EXPECT_TRUE (bvalid);
+}
+
+TEST(CPP20APITests, test_replace_invalid)
+{
+    u8string invalid_sequence = u8"a\x80\xe0\xa0\xc0\xaf\xed\xa0\x80z";
+    u8string replace_invalid_result = replace_invalid(invalid_sequence, u8'?');
+    bool bvalid = is_valid(replace_invalid_result);
+    EXPECT_TRUE (bvalid);
+    const u8string fixed_invalid_sequence = u8"a????z";
+    EXPECT_EQ(fixed_invalid_sequence, replace_invalid_result);
+}
+
+TEST(CPP20APITests, test_starts_with_bom)
+{
+    u8string byte_order_mark = u8"\xef\xbb\xbf";
+    bool bbom = starts_with_bom(byte_order_mark);
+    EXPECT_TRUE (bbom);
+    u8string threechars = u8"\xf0\x90\x8d\x86\xe6\x97\xa5\xd1\x88";
+    bool no_bbom = starts_with_bom(threechars);
+    EXPECT_FALSE (no_bbom);
+}