1 files changed, 88 insertions, 0 deletions
diff --git a/lib/utfcpp/v4/tests/test_cpp17.cpp b/lib/utfcpp/v4/tests/test_cpp17.cpp
new file mode 100644
index 00000000..a38e6f71
--- /dev/null
+++ b/lib/utfcpp/v4/tests/test_cpp17.cpp
@@ -0,0 +1,88 @@
+#include "../extern/ftest/ftest.h"
+#include "utf8.h"
+#include <string>
+using namespace utf8;
+using namespace std;
+
+#if __cplusplus >= 201703L // C++ 17 or later
+
+
+TEST(CPP17APITests, test_utf16to8)
+{
+    u16string utf16string = {0x41, 0x0448, 0x65e5, 0xd834, 0xdd1e};
+    u16string_view utf16stringview(utf16string);
+    string u = utf16to8(utf16stringview);
+    EXPECT_EQ (u.size(), 10);
+}
+
+TEST(CPP17APITests, test_utf8to16)
+{
+    string_view utf8_with_surrogates = "\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(CPP17APITests, test_utf32to8)
+{
+    u32string utf32string = {0x448, 0x65E5, 0x10346};
+    u32string_view utf32stringview(utf32string);
+    string utf8result = utf32to8(utf32stringview);
+    EXPECT_EQ (utf8result.size(), 9);
+}
+
+TEST(CPP17APITests, test_utf8to32)
+{
+    string_view twochars = "\xe6\x97\xa5\xd1\x88";
+    u32string utf32result = utf8to32(twochars);
+    EXPECT_EQ (utf32result.size(), 2);
+}
+
+TEST(CPP17APITests, test_find_invalid)
+{
+    string_view utf_invalid = "\xe6\x97\xa5\xd1\x88\xfa";
+    auto invalid = find_invalid(utf_invalid);
+    EXPECT_EQ (invalid, 5);
+}
+
+TEST(CPP17APITests, test_is_valid)
+{
+    string_view utf_invalid = "\xe6\x97\xa5\xd1\x88\xfa";
+    bool bvalid = is_valid(utf_invalid);
+    EXPECT_FALSE (bvalid);
+    string_view utf8_with_surrogates = "\xe6\x97\xa5\xd1\x88\xf0\x9d\x84\x9e";
+    bvalid = is_valid(utf8_with_surrogates);
+    EXPECT_TRUE (bvalid);
+}
+
+TEST(CPP17APITests, test_replace_invalid)
+{
+    string_view invalid_sequence = "a\x80\xe0\xa0\xc0\xaf\xed\xa0\x80z";
+    string replace_invalid_result = replace_invalid(invalid_sequence, '?');
+    bool bvalid = is_valid(replace_invalid_result);
+    EXPECT_TRUE (bvalid);
+    const string fixed_invalid_sequence = "a????z";
+    EXPECT_EQ(fixed_invalid_sequence, replace_invalid_result);
+}
+
+TEST(CPP17APITests, test_starts_with_bom)
+{
+    string byte_order_mark = {char(0xef), char(0xbb), char(0xbf)};
+    string_view byte_order_mark_view(byte_order_mark);
+    bool bbom = starts_with_bom(byte_order_mark_view);
+    EXPECT_TRUE (bbom);
+    string_view threechars = "\xf0\x90\x8d\x86\xe6\x97\xa5\xd1\x88";
+    bool no_bbom = starts_with_bom(threechars);
+    EXPECT_FALSE (no_bbom);
+}
+
+TEST(CPP17APITests, string_class_and_literals)
+{
+    const char* twochars = u8"ab";
+    EXPECT_TRUE (is_valid(twochars));
+    const string two_chars_string(twochars);
+    EXPECT_TRUE (is_valid(two_chars_string));
+}
+
+#endif  // C++ 11 or later