More plugin testing (#3052)

* Add a check of a child panel too

* do not cover error catching

* test for implementation error

* Add warning to test for

* Add test for event_sample

* ignore safety switches

* Add a settings flag to enable event testing

* test if not implemented is raises

* raise plugin specific errors

* use plugin specific error

* fix assertation

* add test for mixin

* this point can't be reached

* add tests for locate plugin

* fix assertations

* fix function call

* refert switch

* this is already caught by the internal API

* also cover mixin redirect

InvenTree/plugin/base/integration/test_mixins.py

@@ -8,6 +8,7 @@ from error_report.models import Error
 
 from InvenTree.helpers import InvenTreeTestCase
 from plugin import InvenTreePlugin
+from plugin.base.integration.mixins import PanelMixin
 from plugin.helpers import MixinNotImplementedError
 from plugin.mixins import (APICallMixin, AppMixin, NavigationMixin,
                            SettingsMixin, UrlsMixin)
@@ -324,7 +325,7 @@ class PanelMixinTests(InvenTreeTestCase):
         urls = [
             reverse('part-detail', kwargs={'pk': 1}),
             reverse('stock-item-detail', kwargs={'pk': 2}),
-            reverse('stock-location-detail', kwargs={'pk': 1}),
+            reverse('stock-location-detail', kwargs={'pk': 2}),
         ]
 
         plugin.set_setting('ENABLE_HELLO_WORLD', False)
@@ -379,3 +380,13 @@ class PanelMixinTests(InvenTreeTestCase):
 
         # Assert that each request threw an error
         self.assertEqual(Error.objects.count(), n_errors + len(urls))
+
+    def test_mixin(self):
+        """Test that ImplementationError is raised"""
+
+        with self.assertRaises(MixinNotImplementedError):
+            class Wrong(PanelMixin, InvenTreePlugin):
+                pass
+
+            plugin = Wrong()
+            plugin.get_custom_panels('abc', 'abc')