Add a test

tests/functional/openlp_core/test_init.py

@@ -24,6 +24,8 @@ import sys
 from unittest import TestCase
 from unittest.mock import MagicMock, patch
 
+from PyQt5 import QtWidgets
+
 from openlp.core import OpenLP, parse_options
 
 
@@ -156,3 +158,73 @@ class TestOpenLP(TestCase):
         assert result is False
 
         del app
+
+    @patch('openlp.core.QtCore.QSharedMemory')
+    def test_is_already_running_not_running(self, MockedSharedMemory):
+        """
+        Test the is_already_running() method when OpenLP is NOT running
+        """
+        # GIVEN: An OpenLP app and some mocks
+        mocked_shared_memory = MagicMock()
+        mocked_shared_memory.attach.return_value = False
+        MockedSharedMemory.return_value = mocked_shared_memory
+        app = OpenLP([])
+
+        # WHEN: is_already_running() is called
+        result = app.is_already_running()
+
+        # THEN: The result should be false
+        MockedSharedMemory.assert_called_once_with('OpenLP')
+        mocked_shared_memory.attach.assert_called_once_with()
+        mocked_shared_memory.create.assert_called_once_with(1)
+        assert result is False
+
+    @patch('openlp.core.QtWidgets.QMessageBox.critical')
+    @patch('openlp.core.QtWidgets.QMessageBox.StandardButtons')
+    @patch('openlp.core.QtCore.QSharedMemory')
+    def test_is_already_running_is_running_continue(self, MockedSharedMemory, MockedStandardButtons, mocked_critical):
+        """
+        Test the is_already_running() method when OpenLP IS running and the user chooses to continue
+        """
+        # GIVEN: An OpenLP app and some mocks
+        mocked_shared_memory = MagicMock()
+        mocked_shared_memory.attach.return_value = True
+        MockedSharedMemory.return_value = mocked_shared_memory
+        MockedStandardButtons.return_value = 0
+        mocked_critical.return_value = QtWidgets.QMessageBox.Yes
+        app = OpenLP([])
+
+        # WHEN: is_already_running() is called
+        result = app.is_already_running()
+
+        # THEN: The result should be false
+        MockedSharedMemory.assert_called_once_with('OpenLP')
+        mocked_shared_memory.attach.assert_called_once_with()
+        MockedStandardButtons.assert_called_once_with(QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
+        mocked_critical.assert_called_once_with(None, 'Error', 'OpenLP is already running. Do you wish to continue?', 0)
+        assert result is False
+
+    @patch('openlp.core.QtWidgets.QMessageBox.critical')
+    @patch('openlp.core.QtWidgets.QMessageBox.StandardButtons')
+    @patch('openlp.core.QtCore.QSharedMemory')
+    def test_is_already_running_is_running_stop(self, MockedSharedMemory, MockedStandardButtons, mocked_critical):
+        """
+        Test the is_already_running() method when OpenLP IS running and the user chooses to stop
+        """
+        # GIVEN: An OpenLP app and some mocks
+        mocked_shared_memory = MagicMock()
+        mocked_shared_memory.attach.return_value = True
+        MockedSharedMemory.return_value = mocked_shared_memory
+        MockedStandardButtons.return_value = 0
+        mocked_critical.return_value = QtWidgets.QMessageBox.No
+        app = OpenLP([])
+
+        # WHEN: is_already_running() is called
+        result = app.is_already_running()
+
+        # THEN: The result should be false
+        MockedSharedMemory.assert_called_once_with('OpenLP')
+        mocked_shared_memory.attach.assert_called_once_with()
+        MockedStandardButtons.assert_called_once_with(QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
+        mocked_critical.assert_called_once_with(None, 'Error', 'OpenLP is already running. Do you wish to continue?', 0)
+        assert result is True