emberjs
diff --git a/‎packages/ember/tests/routing/explicit_index_route_test.js‎
Lines changed: 37 additions & 0 deletions b/‎packages/ember/tests/routing/explicit_index_route_test.js‎
Lines changed: 37 additions & 0 deletions
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+import { moduleFor, ApplicationTestCase } from 'internal-test-helpers';
+
+moduleFor(
+  'Router: explicitly declared index routes (GH#18608)',
+  class extends ApplicationTestCase {
+    async ['@test an explicitly declared index route defaults to path "/index", so the parent URL does not match'](
+      assert
+    ) {
+      this.router.map(function () {
+        this.route('secure', function () {
+          this.route('cluster', { path: '/clusters/:cluster_id' }, function () {
+            this.route('index');
+            this.route('details');
+          });
+        });
+      });
+
+      await assert.rejects(this.visit('/secure/clusters/100'), /\/secure\/clusters\/100/);
+    }
+
+    async ['@test an explicitly declared index route with path "/" matches the parent URL'](
+      assert
+    ) {
+      this.router.map(function () {
+        this.route('secure', function () {
+          this.route('cluster', { path: '/clusters/:cluster_id' }, function () {
+            this.route('index', { path: '/' });
+            this.route('details');
+          });
+        });
+      });
+
+      await this.visit('/secure/clusters/100');
+      assert.equal(this.appRouter.currentURL, '/secure/clusters/100');
+    }
+  }
+);