Move PrefixedCommandRunner -> Prefix

tests/prefix_test.py

@@ -0,0 +1,57 @@
+from __future__ import unicode_literals
+
+import os
+
+import pytest
+
+from pre_commit.prefix import Prefix
+
+
+def norm_slash(*args):
+    return tuple(x.replace('/', os.sep) for x in args)
+
+
+@pytest.mark.parametrize(
+    ('input', 'expected_prefix'), (
+        norm_slash('.', './'),
+        norm_slash('foo', 'foo/'),
+        norm_slash('bar/', 'bar/'),
+        norm_slash('foo/bar', 'foo/bar/'),
+        norm_slash('foo/bar/', 'foo/bar/'),
+    ),
+)
+def test_init_normalizes_path_endings(input, expected_prefix):
+    instance = Prefix(input)
+    assert instance.prefix_dir == expected_prefix
+
+
+PATH_TESTS = (
+    norm_slash('foo', '', 'foo'),
+    norm_slash('foo', 'bar', 'foo/bar'),
+    norm_slash('foo/bar', '../baz', 'foo/baz'),
+    norm_slash('./', 'bar', 'bar'),
+    norm_slash('./', '', '.'),
+    norm_slash('/tmp/foo', '/tmp/bar', '/tmp/bar'),
+)
+
+
+@pytest.mark.parametrize(('prefix', 'path_end', 'expected_output'), PATH_TESTS)
+def test_path(prefix, path_end, expected_output):
+    instance = Prefix(prefix)
+    ret = instance.path(path_end)
+    assert ret == expected_output
+
+
+def test_path_multiple_args():
+    instance = Prefix('foo')
+    ret = instance.path('bar', 'baz')
+    assert ret == os.path.join('foo', 'bar', 'baz')
+
+
+def test_exists_does_not_exist(tmpdir):
+    assert not Prefix(str(tmpdir)).exists('foo')
+
+
+def test_exists_does_exist(tmpdir):
+    tmpdir.ensure('foo')
+    assert Prefix(str(tmpdir)).exists('foo')