Add 'clean' target (#8)

Author: megabyde

Makefile

@@ -19,6 +19,10 @@ format-check:
 	yapf --diff $(SRCS) \
 		|| (echo "Some files require formatting. Run 'make format' to fix." && exit 1)
 
+.PHONY: clean
+clean:
+	git clean -Xfd
+
 ifndef VERBOSE
 .SILENT:
 endif

test_something.py

@@ -1,3 +1,3 @@
 def test_something_pass():
     value = "foo"
-    assert value == "foo"
+    assert value == "foo"