tests: Add missing tests for builtins, and many other things.

tests/unicode/unicode.py

@@ -16,3 +16,7 @@ for i in range(-len(s), len(s)):
 # Test UTF-8 encode and decode
 enc = s.encode()
 print(enc, enc.decode() == s)
+
+# printing of unicode chars using repr
+# TODO we don't do this correctly
+#print(repr(s))

tests/unicode/unicode_chr.py

@@ -0,0 +1,5 @@
+# test builtin chr with unicode characters
+
+print(chr(945))
+print(chr(0x800))
+print(chr(0x10000))

tests/unicode/unicode_ord.py

@@ -0,0 +1,3 @@
+# test builtin ord with unicode characters
+
+print(ord('α'))