Add test for URL rendering

Similar to our previous PR, we want to add some starting test cases to
our url rendering paths so that we are prepared for future updates.

promgen/fixtures/testcases.yaml

@@ -70,3 +70,13 @@
     job: node
     port: 9100
     enabled: false
+- model: promgen.probe
+  pk: 1
+  fields:
+    module: fixture_test
+- model: promgen.url
+  pk: 1
+  fields:
+    project: 1
+    probe: 1
+    url: probe.example.com

promgen/rest.py

@@ -39,6 +39,13 @@ def targets(self, request):
             content_type="application/json",
         )
 
+    @action(detail=False, methods=["get"], renderer_classes=[renderers.renderers.JSONRenderer])
+    def urls(self, request):
+        return HttpResponse(
+            prometheus.render_urls(),
+            content_type="application/json",
+        )
+
 
 class ShardViewSet(viewsets.ModelViewSet):
     queryset = models.Shard.objects.all()

promgen/templates/promgen/navbar.html

@@ -36,7 +36,7 @@
                         <li><a href="{% url 'api:api-root' %}">API</a></li>
                         <li><a href="{% url 'api:all-targets' %}">Export Targets</a></li>
                         <li><a href="{% url 'api:all-rules' %}">Export Rules</a></li>
-                        <li><a href="{% url 'config-urls' %}">Export URL</a></li>
+                        <li><a href="{% url 'api:all-urls' %}">Export URLs</a></li>
                     </ul>
                 </li>
                 {% include 'promgen/help_menu.inc.html' %}

promgen/tests/examples/export.urls.json

@@ -0,0 +1,12 @@
+[
+  {
+    "labels": {
+      "__param_module": "fixture_test",
+      "__shard": "test-shard",
+      "job": "fixture_test",
+      "project": "test-project",
+      "service": "test-service"
+    },
+    "targets": ["probe.example.com"]
+  }
+]

promgen/tests/test_renderers.py

@@ -23,3 +23,9 @@ def test_global_targets(self):
         response = self.client.get(reverse("api:all-targets"))
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.json(), expected)
+
+    def test_global_urls(self):
+        expected = tests.Data("examples", "export.urls.json").json()
+        response = self.client.get(reverse("api:all-urls"))
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.json(), expected)