[Fix] Frontend Testing Fixtures (#249)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Co-authored-by: Liam Brydon <lbry121@aucklanduni.ac.nz>
Reviewed-on: enviPath/enviPy#249

tests/frontend/frontend_base.py

@@ -0,0 +1,69 @@
+import os
+
+from django.conf import settings as s
+from django.contrib.staticfiles.testing import StaticLiveServerTestCase
+from django.core.management import call_command
+from django.test import override_settings
+from playwright.sync_api import sync_playwright
+
+
+@override_settings(MODEL_DIR=s.FIXTURE_DIRS[0] / "models", CELERY_TASK_ALWAYS_EAGER=True)
+class EnviPyStaticLiveServerTestCase(StaticLiveServerTestCase):
+    fixtures = ["test_fixtures_incl_model.jsonl.gz"]
+
+    @staticmethod
+    def repair_polymorphic_ctypes():
+        from django.contrib.contenttypes.models import ContentType
+
+        from epdb.models import EPModel
+
+        for obj in EPModel.objects.filter(polymorphic_ctype__isnull=True):
+            obj.polymorphic_ctype = ContentType.objects.get_for_model(obj.__class__)
+            obj.save(update_fields=["polymorphic_ctype"])
+
+    @classmethod
+    def setUpClass(cls):
+        os.environ["DJANGO_ALLOW_ASYNC_UNSAFE"] = "true"
+        super().setUpClass()
+
+        cls.playwright = sync_playwright().start()
+        cls.browser = cls.playwright.chromium.launch()
+        cls.username = "user0"
+        cls.password = "SuperSafe"
+
+    def setUp(self):
+        # DB gets flushed after each test and rolled back to initial fixture state.
+        # Hence, we have to localize the urls per test.
+        # The fixtures have "http://localhost:8000/" in all of the URLs
+        # Use the custom mgmt command to adjust it to the current live_server_url
+        call_command("localize_urls", old="http://localhost:8000/", new=f"{self.live_server_url}/")
+
+        # Fix broken polymorphic ctypes
+        EnviPyStaticLiveServerTestCase.repair_polymorphic_ctypes()
+
+        s.SERVER_URL = self.live_server_url
+        self.context = self.browser.new_context()
+        self.page = self.context.new_page()
+
+    def tearDown(self):
+        self.page.wait_for_load_state("networkidle")
+        self.page.close()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.browser.close()
+        cls.playwright.stop()
+        super().tearDownClass()
+
+    def login(self):
+        """Sign in with the test user, 'user0'"""
+        self.page.goto(self.live_server_url + "/login")
+        self.page.get_by_role("textbox", name="Username").click()
+        self.page.get_by_role("textbox", name="Username").fill(self.username)
+        self.page.get_by_role("textbox", name="Password").click()
+        self.page.get_by_role("textbox", name="Password").fill(self.password)
+
+        with self.page.expect_navigation():
+            self.page.get_by_role("button", name="Sign In").click()
+
+        return self.page