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

tests/basics/builtin_sorted.py

@@ -0,0 +1,10 @@
+# test builtin sorted
+
+print(sorted(set(range(100))))
+print(sorted(set(range(100)), key=lambda x: x + 100*(x % 2)))
+
+# need to use keyword argument
+try:
+    sorted([], None)
+except TypeError:
+    print("TypeError")