diff --git a/unittests/string_unicode_ascii.chai b/unittests/string_unicode_ascii.chai
new file mode 100644
index 0000000..aca62d8
--- /dev/null
+++ b/unittests/string_unicode_ascii.chai
@@ -0,0 +1,8 @@
+assert_equal('\u0020', ' ')
+assert_equal('\u0021', '!')
+assert_equal('\u0030', '0')
+assert_equal('\u0040', '@')
+assert_equal('\u005B', '[')
+assert_equal('\u005d', ']')
+assert_equal('\u0061', 'a')
+assert_equal('\u007e', '~')
diff --git a/unittests/string_unicode_parse.chai b/unittests/string_unicode_parse.chai
new file mode 100644
index 0000000..8807126
--- /dev/null
+++ b/unittests/string_unicode_parse.chai
@@ -0,0 +1,11 @@
+assert_equal('\u00aa', '\u00AA')
+assert_equal('\u00bb', '\uBB')
+assert_equal('\ucc', '\u00CC')
+assert_equal('\udd', '\uDD')
+
+assert_equal('\u0ee', '\uEE')
+assert_equal('\ue', '\u000E')
+
+assert_equal("\u30\u31\u32", "123")
+assert_equal("\u33Test", "4Test")
+assert_equal("Test\u0040", "Test@")
diff --git a/unittests/string_unicode_unicode.chai b/unittests/string_unicode_unicode.chai
new file mode 100644
index 0000000..3911d8e
--- /dev/null
+++ b/unittests/string_unicode_unicode.chai
@@ -0,0 +1,5 @@
+assert_equal('\u0220', 'Ü')
+assert_equal("U for \u0220mlauts", "U for Ümlauts")
+assert_equal("More \u0220ml\u0228\u0252ts", "More Ümläüts")
+
+assert_equal("Happy \u30C4 face", "Happy ツ face")