new hook tests for broken symlinks

diff --git a/pre_commit_hooks/check_symlinks.py b/pre_commit_hooks/check_symlinks.py
new file mode 100644
index 0000000..d0f0f09
--- /dev/null
+++ b/pre_commit_hooks/check_symlinks.py

@@ -0,0 +1,26 @@
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import argparse
+import os
+import os.path
+
+
+def check_symlinks(argv=None):
+    parser = argparse.ArgumentParser(description='Checks for broken symlinks.')
+    parser.add_argument('filenames', nargs='*', help='Filenames to check')
+    args = parser.parse_args(argv)
+
+    retv = 0
+
+    for filename in args.filenames:
+        if os.path.islink(filename) and not os.path.exists(filename):
+            print('{0}: Broken symlink'.format(filename))
+            retv = 1
+
+    return retv
+
+
+if __name__ == '__main__':
+    exit(check_symlinks())

diff --git a/testing/resources/broken_symlink b/testing/resources/broken_symlink
new file mode 120000
index 0000000..ee1f6cb
--- /dev/null
+++ b/testing/resources/broken_symlink

@@ -0,0 +1 @@
+does_not_exist
\ No newline at end of file

diff --git a/testing/resources/does_exist b/testing/resources/does_exist
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/testing/resources/does_exist


diff --git a/testing/resources/working_symlink b/testing/resources/working_symlink
new file mode 120000
index 0000000..20b5061
--- /dev/null
+++ b/testing/resources/working_symlink

@@ -0,0 +1 @@
+does_exist
\ No newline at end of file

diff --git a/tests/check_symlinks_test.py b/tests/check_symlinks_test.py
new file mode 100644
index 0000000..2235be0
--- /dev/null
+++ b/tests/check_symlinks_test.py

@@ -0,0 +1,13 @@
+import pytest
+
+from pre_commit_hooks.check_symlinks import check_symlinks
+from testing.util import get_resource_path
+
+
+@pytest.mark.parametrize(('filename', 'expected_retval'), (
+    ('broken_symlink', 1),
+    ('working_symlink', 0),
+))
+def test_check_symlinks(filename, expected_retval):
+    ret = check_symlinks([get_resource_path(filename)])
+    assert ret == expected_retval