1 files changed, 53 insertions, 0 deletions
diff --git a/tools/lint/test/test_black.py b/tools/lint/test/test_black.py
new file mode 100644
index 0000000000..9027670665
--- /dev/null
+++ b/tools/lint/test/test_black.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import mozunit
+
+LINTER = "black"
+fixed = 0
+
+
+def test_lint_fix(lint, create_temp_file):
+
+    contents = """def is_unique(
+               s
+               ):
+    s = list(s
+                )
+    s.sort()
+
+
+    for i in range(len(s) - 1):
+        if s[i] == s[i + 1]:
+            return 0
+    else:
+        return 1
+
+
+if __name__ == "__main__":
+    print(
+          is_unique(input())
+         ) """
+
+    path = create_temp_file(contents, "bad.py")
+    lint([path], fix=True)
+    assert fixed == 1
+
+
+def test_lint_black(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.py"
+
+    assert "EOF" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "invalid.py"
+
+
+if __name__ == "__main__":
+    mozunit.main()