Add a test that starts MainActivity

To run on a build system, this requires mocking Android-specific APIs.

https://phabricator.endlessm.com/T34155

Author: dylanmccall

src/kolibri_android/tests/__main__.py

@@ -11,8 +11,6 @@ def main():
     selftest_runner = unittest.runner.TextTestRunner()
     selftest_runner.run(selftests)
 
-    selftest_suite = unittest.TestSuite()
-
 
 if __name__ == "__main__":
     main()

src/kolibri_android/tests/test_main_activity.py

@@ -0,0 +1,68 @@
+import os
+import sys
+import tempfile
+from unittest import TestCase
+from unittest.mock import DEFAULT
+from unittest.mock import MagicMock
+from unittest.mock import patch
+
+# TODO: Only mock these modules when Android is unavailable
+android_mock = MagicMock()
+jnius_mock = MagicMock()
+runnable_mock = MagicMock()
+
+
+@patch.dict(
+    sys.modules,
+    {
+        "android.activity": android_mock,
+        "jnius": jnius_mock,
+        "kolibri_android.runnable": runnable_mock,
+    },
+)
+class MainActivityTestCase(TestCase):
+    def setUp(self):
+        self.kolibri_home_tempdir = tempfile.TemporaryDirectory()
+        os.environ["KOLIBRI_HOME"] = self.kolibri_home_tempdir.name
+
+    def tearDown(self):
+        self.kolibri_home_tempdir.cleanup()
+        self.kolibri_home_tempdir = None
+
+    @patch.multiple(
+        "kolibri_android.android_utils",
+        configure_webview=DEFAULT,
+        get_signature_key_issuing_organization=DEFAULT,
+        get_timezone_name=DEFAULT,
+        get_version_name=DEFAULT,
+        get_endless_key_uris=DEFAULT,
+        get_home_folder=DEFAULT,
+    )
+    @patch.multiple(
+        "kolibri_android.main_activity.kolibri_bus.KolibriAppProcessBus",
+        run=DEFAULT,
+    )
+    def test_activity_run(self, **mocks):
+        mocks["get_signature_key_issuing_organization"].return_value = "test"
+        mocks["get_timezone_name"].return_value = "UTC"
+        mocks["get_version_name"].return_value = "Unknown"
+        mocks["get_endless_key_uris"].return_value = None
+        mocks["get_home_folder"].return_value = self.kolibri_home_tempdir.name
+
+        from kolibri_android.main_activity.activity import MainActivity
+
+        main_activity = MainActivity()
+
+        mocks["configure_webview"].assert_called_once()
+
+        (on_load_fn, on_load_with_usb_fn, on_loading_ready_fn) = mocks[
+            "configure_webview"
+        ].call_args.args
+
+        on_load_fn()
+
+        # FIXME: We can't use main_activity.run() because it loops forever.
+
+        main_activity.start_kolibri()
+
+        mocks["run"].assert_called_once()