Make entry points simpler

tests/repository_test.py

@@ -65,6 +65,7 @@ def test_run_a_hook_lots_of_files(config_for_python_pre_commit_git_repo):
     os.environ.get('slowtests', None) == 'false',
     reason="TODO: make this test not super slow",
 )
+@pytest.mark.integration
 def test_run_a_node_hook(config_for_node_pre_commit_git_repo):
     repo = Repository(config_for_node_pre_commit_git_repo)
     repo.install()

tests/util_test.py

@@ -1,9 +1,12 @@
 
+import mock
 import pytest
 import random
+import sys
 from plumbum import local
 
 from pre_commit.util import cached_property
+from pre_commit.util import entry
 from pre_commit.util import memoize_by_cwd
 
 
@@ -59,3 +62,25 @@ def test_memoized_by_cwd_changes_with_different_cwd(memoized_by_cwd):
         ret2 = memoized_by_cwd('baz')
 
     assert ret != ret2
+
+
+@pytest.fixture
+def entry_func():
+    @entry
+    def func(argv):
+        return argv
+
+    return func
+
+
+def test_explicitly_passed_argv_are_passed(entry_func):
+    input = object()
+    ret = entry_func(input)
+    assert ret is input
+
+
+def test_no_arguments_passed_uses_argv(entry_func):
+    argv = [1, 2, 3, 4]
+    with mock.patch.object(sys, 'argv', argv):
+        ret = entry_func()
+        assert ret == argv[1:]