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

tests/basics/fun_error.py

@@ -0,0 +1,31 @@
+# test errors from bad function calls
+
+def test_exc(code, exc):
+    try:
+        exec(code)
+        print("no exception")
+    except exc:
+        print("right exception")
+    except:
+        print("wrong exception")
+
+# function doesn't take keyword args
+test_exc("[].append(x=1)", TypeError)
+
+# function with variable number of positional args given too few
+test_exc("round()", TypeError)
+
+# function with variable number of positional args given too many
+test_exc("round(1, 2, 3)", TypeError)
+
+# function with fixed number of positional args given wrong number
+test_exc("[].append(1, 2)", TypeError)
+
+# function with keyword args given extra positional args
+test_exc("[].sort(1)", TypeError)
+
+# function with keyword args given extra keyword args
+test_exc("[].sort(noexist=1)", TypeError)
+
+# function with keyword args not given a specific keyword arg
+test_exc("enumerate()", TypeError)