Support --fmt

tools/fmt_test.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import os
+import sys
+from util import mkdtemp, root_path, tests_path, run, green_ok
+import shutil
+
+
+def fmt_test(deno_exe):
+    sys.stdout.write("fmt_test...")
+    sys.stdout.flush()
+    d = mkdtemp()
+    try:
+        fixed_filename = os.path.join(tests_path, "badly_formatted_fixed.js")
+        src = os.path.join(tests_path, "badly_formatted.js")
+        dst = os.path.join(d, "badly_formatted.js")
+        shutil.copyfile(src, dst)
+        # Set DENO_DIR to //js/ so we don't have to rely on an intenet
+        # connection to download https://deno.land/x/std/prettier/main.ts
+        deno_dir = os.path.join(root_path, "js")
+        run([deno_exe, dst, "--fmt"], merge_env={"DENO_DIR": deno_dir})
+        with open(fixed_filename) as f:
+            expected = f.read()
+        with open(dst) as f:
+            actual = f.read()
+        assert expected == actual
+    finally:
+        shutil.rmtree(d)
+    print green_ok()
+
+
+if __name__ == "__main__":
+    fmt_test(sys.argv[1])
+