Move tests in basic/tests/ up one level preparating to multiple test dirs.

tests/basics/fun2.py

@@ -0,0 +1,10 @@
+# calling a function from a function
+
+def f(x):
+    print(x + 1)
+
+def g(x):
+    f(2 * x)
+    f(4 * x)
+
+g(3)