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tests/languages/docker_test.py

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+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+import mock
+
+from pre_commit.languages import docker
+from pre_commit.util import CalledProcessError
+
+
+def test_docker_is_running_process_error():
+    with mock.patch(
+        'pre_commit.languages.docker.cmd_output',
+        side_effect=CalledProcessError(*(None,) * 4)
+    ):
+        assert docker.docker_is_running() is False