Run all tools in a filesystem sandbox

sandbox_fs_test.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2016 Andrew Hamilton. All rights reserved.
+# Licensed under the Artistic License 2.0.
+
+import os
+import tempfile
+import unittest
+
+import sandbox_fs
+
+
+class SandboxFilesystemTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.temp_dir = tempfile.mkdtemp()
+        self.sandbox = sandbox_fs.SandboxFs(self.temp_dir)
+        self.sandbox.mount()
+
+    def tearDown(self):
+        self.sandbox.umount()
+        os.rmdir(self.temp_dir)
+
+    def test_sandbox_minimal(self):
+        foo_upper_path = os.path.join(self.sandbox.mount_point, "foo")
+        open(foo_upper_path, "w").close()
+        self.assertTrue(os.path.exists(foo_upper_path))
+        foo_lower_path = os.path.join(self.sandbox.overlay_mounts[0].lower_dir,
+                                      "foo")
+        self.assertFalse(os.path.exists(foo_lower_path))
+
+    def test_home_directory_exists_in_the_sandbox(self):
+        home_directory = (self.sandbox.mount_point + os.environ["HOME"])
+        self.assertTrue(os.path.exists(home_directory))
+
+    def test_run_a_command_in_the_sandbox(self):
+        stdout, stderr, returncode = self.sandbox.run_command(["pwd"])
+        self.assertEqual(stdout.strip().decode("utf-8"), os.environ["PWD"])
+
+
+if __name__ == "__main__":
+    unittest.main()