LibUnicode: Generate simple case folding mappings for titlecase

Note we already generate the special case foldings for titlecase.

1 files changed, 26 insertions, 0 deletions

diff --git a/Tests/LibUnicode/TestUnicodeCharacterTypes.cpp b/Tests/LibUnicode/TestUnicodeCharacterTypes.cpp
index d6eb43e103..dd6f5c4654 100644
--- a/Tests/LibUnicode/TestUnicodeCharacterTypes.cpp
+++ b/Tests/LibUnicode/TestUnicodeCharacterTypes.cpp
@@ -48,6 +48,32 @@ TEST_CASE(to_unicode_uppercase)
     EXPECT_EQ(Unicode::to_unicode_uppercase(0x3401u), 0x3401u);
     EXPECT_EQ(Unicode::to_unicode_uppercase(0x3402u), 0x3402u);
     EXPECT_EQ(Unicode::to_unicode_uppercase(0x4dbfu), 0x4dbfu);
+
+    // Code points whose uppercase and titlecase mappings actually differ.
+    EXPECT_EQ(Unicode::to_unicode_uppercase(0x01c6u), 0x01c4u); // "dž" to "DŽ"
+    EXPECT_EQ(Unicode::to_unicode_uppercase(0x01c9u), 0x01c7u); // "lj" to "LJ"
+    EXPECT_EQ(Unicode::to_unicode_uppercase(0x01ccu), 0x01cau); // "nj" to "NJ"
+    EXPECT_EQ(Unicode::to_unicode_uppercase(0x01f3u), 0x01f1u); // "dz" to "DZ"
+}
+
+TEST_CASE(to_unicode_titlecase)
+{
+    compare_to_ascii(toupper, Unicode::to_unicode_titlecase);
+
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x03c9u), 0x03a9u); // "ω" to "Ω"
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x03a9u), 0x03a9u); // "Ω" to "Ω"
+
+    // Code points encoded by ranges in UnicodeData.txt
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x3400u), 0x3400u);
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x3401u), 0x3401u);
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x3402u), 0x3402u);
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x4dbfu), 0x4dbfu);
+
+    // Code points whose uppercase and titlecase mappings actually differ.
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x01c6u), 0x01c5u); // "dž" to "Dž"
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x01c9u), 0x01c8u); // "lj" to "Lj"
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x01ccu), 0x01cbu); // "nj" to "Nj"
+    EXPECT_EQ(Unicode::to_unicode_titlecase(0x01f3u), 0x01f2u); // "dz" to "Dz"
 }
 
 TEST_CASE(to_unicode_lowercase_unconditional_special_casing)