Add internal/lib/driver_test_lib.py to fix unit tests.

Add a script to run all unit tests.
Test: tools/acloud/run_tests.sh

.gitignore

+*.pyc
+*.*~

README.md

@@ -11,4 +11,9 @@ Devices on Google Compute Engine) instantiated by using the Android source code
     `$ pip install acloud.zip`
 
 #3. Execution:
+
     `$ acloud <flags>
+
+To run all unit tests:
+
+    `$ tools\acloud\run_tests.sh`

internal/lib/driver_test_lib.py

+#!/usr/bin/env python
+#
+# Copyright 2017 - The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Driver test library."""
+
+import mock
+import unittest
+
+
+class BaseDriverTest(unittest.TestCase):
+    """Base class for driver tests."""
+
+    def setUp(self):
+        """Set up test."""
+        self._patchers = []
+
+    def tearDown(self):
+        """Tear down test."""
+        for patcher in reversed(self._patchers):
+            patcher.stop()
+
+    def Patch(self, *args, **kwargs):
+        """A wrapper for mock.patch.object.
+
+        This wrapper starts a patcher and store it in self._patchers,
+        so that we can later stop them in tearDown.
+
+        Args:
+          *args: Arguments to pass to mock.patch.
+          **kwargs: Keyword arguments to pass to mock.patch.
+
+        Returns:
+          Mock object
+        """
+        patcher = mock.patch.object(*args, **kwargs)
+        self._patchers.append(patcher)
+        return patcher.start()

public/device_driver_test.py

@@ -24,7 +24,7 @@ import mock
 
 import unittest
 from acloud.internal.lib import auth
-from acloud.internal.lib import andorid_build_client
+from acloud.internal.lib import android_build_client
 from acloud.internal.lib import android_compute_client
 from acloud.internal.lib import driver_test_lib
 from acloud.internal.lib import gstorage_client

run_tests.sh

+#!/bin/bash
+
+if [ -z "$ANDROID_BUILD_TOP" ]; then
+    echo "Missing ANDROID_BUILD_TOP env variable. Run 'lunch' first."
+    exit 1
+fi
+
+# Runs all unit tests under tools/acloud.
+tests=$(find . -type f | grep test\.py)
+for t in $tests; do
+    PYTHONPATH=$ANDROID_BUILD_TOP/tools python $t;
+done