Add first class support for golang hooks

tests/languages/golang_test.py

@@ -0,0 +1,22 @@
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+import pytest
+
+from pre_commit.languages.golang import guess_go_dir
+
+
+@pytest.mark.parametrize(
+    ('url', 'expected'),
+    (
+        ('/im/a/path/on/disk', 'unknown_src_dir'),
+        ('git@github.com:golang/lint', 'github.com/golang/lint'),
+        ('git://github.com/golang/lint', 'github.com/golang/lint'),
+        ('http://github.com/golang/lint', 'github.com/golang/lint'),
+        ('https://github.com/golang/lint', 'github.com/golang/lint'),
+        ('ssh://git@github.com/golang/lint', 'github.com/golang/lint'),
+        ('git@github.com:golang/lint.git', 'github.com/golang/lint'),
+    ),
+)
+def test_guess_go_dir(url, expected):
+    assert guess_go_dir(url) == expected

tests/repository_test.py

@@ -257,6 +257,14 @@ def test_swift_hook(tempdir_factory, store):
     )
 
 
+@pytest.mark.integration
+def test_golang_hook(tempdir_factory, store):
+    _test_hook_repo(
+        tempdir_factory, store, 'golang_hooks_repo',
+        'golang-hook', [], b'hello world\n',
+    )
+
+
 @pytest.mark.integration
 def test_missing_executable(tempdir_factory, store):
     _test_hook_repo(