test: updated custom command test to index python code

testing/project_setup/custom_command_python/data/src/bar.py

@@ -0,0 +1,3 @@
+class Bar:
+	def __init__(self):
+		self.baz = 'Initial String'

testing/project_setup/custom_command_python/data/src/foo.py

@@ -0,0 +1,5 @@
+import bar
+
+class Foo(bar.Bar):
+	def print(self):
+		print(self.baz)

testing/project_setup/custom_command_python/data/src/main.py

@@ -0,0 +1,5 @@
+import foo
+
+def main():
+	f = foo.Foo()
+	f.print()