1 files changed, 75 insertions, 0 deletions
diff --git a/tests/languages/python_test.py b/tests/languages/python_test.py
new file mode 100644
index 0000000..34c6c7f
--- /dev/null
+++ b/tests/languages/python_test.py
@@ -0,0 +1,75 @@
+import os.path
+import sys
+from unittest import mock
+
+import pytest
+
+import pre_commit.constants as C
+from pre_commit.languages import python
+from pre_commit.prefix import Prefix
+
+
+def test_norm_version_expanduser():
+    home = os.path.expanduser('~')
+    if os.name == 'nt':  # pragma: nt cover
+        path = r'~\python343'
+        expected_path = fr'{home}\python343'
+    else:  # pragma: nt no cover
+        path = '~/.pyenv/versions/3.4.3/bin/python'
+        expected_path = f'{home}/.pyenv/versions/3.4.3/bin/python'
+    result = python.norm_version(path)
+    assert result == expected_path
+
+
+@pytest.mark.parametrize('v', ('python3.6', 'python3', 'python'))
+def test_sys_executable_matches(v):
+    with mock.patch.object(sys, 'version_info', (3, 6, 7)):
+        assert python._sys_executable_matches(v)
+
+
+@pytest.mark.parametrize('v', ('notpython', 'python3.x'))
+def test_sys_executable_matches_does_not_match(v):
+    with mock.patch.object(sys, 'version_info', (3, 6, 7)):
+        assert not python._sys_executable_matches(v)
+
+
+@pytest.mark.parametrize(
+    ('exe', 'realpath', 'expected'), (
+        ('/usr/bin/python3', '/usr/bin/python3.7', 'python3'),
+        ('/usr/bin/python', '/usr/bin/python3.7', 'python3.7'),
+        ('/usr/bin/python', '/usr/bin/python', None),
+        ('/usr/bin/python3.6m', '/usr/bin/python3.6m', 'python3.6m'),
+        ('v/bin/python', 'v/bin/pypy', 'pypy'),
+    ),
+)
+def test_find_by_sys_executable(exe, realpath, expected):
+    with mock.patch.object(sys, 'executable', exe):
+        with mock.patch.object(os.path, 'realpath', return_value=realpath):
+            with mock.patch.object(python, 'find_executable', lambda x: x):
+                assert python._find_by_sys_executable() == expected
+
+
+def test_healthy_types_py_in_cwd(tmpdir):
+    with tmpdir.as_cwd():
+        prefix = tmpdir.join('prefix').ensure_dir()
+        prefix.join('setup.py').write('import setuptools; setuptools.setup()')
+        prefix = Prefix(str(prefix))
+        python.install_environment(prefix, C.DEFAULT, ())
+
+        # even if a `types.py` file exists, should still be healthy
+        tmpdir.join('types.py').ensure()
+        assert python.healthy(prefix, C.DEFAULT) is True
+
+
+def test_healthy_python_goes_missing(tmpdir):
+    with tmpdir.as_cwd():
+        prefix = tmpdir.join('prefix').ensure_dir()
+        prefix.join('setup.py').write('import setuptools; setuptools.setup()')
+        prefix = Prefix(str(prefix))
+        python.install_environment(prefix, C.DEFAULT, ())
+
+        exe_name = 'python' if sys.platform != 'win32' else 'python.exe'
+        py_exe = prefix.path(python.bin_dir('py_env-default'), exe_name)
+        os.remove(py_exe)
+
+        assert python.healthy(prefix, C.DEFAULT) is False