From b3c57c8f26dfefb16f11773a5a064e151578478e Mon Sep 17 00:00:00 2001
From: Emily Sun <qirans3@uci.edu>
Date: Mon, 8 Jun 2026 23:33:09 -0700
Subject: [PATCH] test(frontend): add spec for FlarumComponent

Verifies that the component asks DomSanitizer to trust the "forum" resource URL
at construction time, exposes the sanitizer's SafeResourceUrl as flarumUrl, and
binds it to the iframe [src] in the template. Spies on the real DomSanitizer
rather than stubbing it so Angular's runtime accepts the SafeResourceUrl during
template rendering.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 .../user/flarum/flarum.component.spec.ts      | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 frontend/src/app/dashboard/component/user/flarum/flarum.component.spec.ts

diff --git a/frontend/src/app/dashboard/component/user/flarum/flarum.component.spec.ts b/frontend/src/app/dashboard/component/user/flarum/flarum.component.spec.ts
new file mode 100644
index 00000000000..15ed6926c60
--- /dev/null
+++ b/frontend/src/app/dashboard/component/user/flarum/flarum.component.spec.ts
@@ -0,0 +1,60 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ComponentFixture, TestBed } from "@angular/core/testing";
+import { DomSanitizer } from "@angular/platform-browser";
+
+import { FlarumComponent } from "./flarum.component";
+
+describe("FlarumComponent", () => {
+  let fixture: ComponentFixture<FlarumComponent>;
+  let component: FlarumComponent;
+  let bypassSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({ imports: [FlarumComponent] });
+
+    // Spy on the real sanitizer before the component is constructed, so the
+    // constructor's call to bypassSecurityTrustResourceUrl is recorded.
+    const sanitizer = TestBed.inject(DomSanitizer);
+    bypassSpy = vi.spyOn(sanitizer, "bypassSecurityTrustResourceUrl");
+
+    fixture = TestBed.createComponent(FlarumComponent);
+    component = fixture.componentInstance;
+  });
+
+  it("asks DomSanitizer to trust the forum resource url at construction time", () => {
+    expect(bypassSpy).toHaveBeenCalledExactlyOnceWith("forum");
+  });
+
+  it("exposes the sanitizer's SafeResourceUrl as flarumUrl", () => {
+    // The spy returns the real SafeResourceUrl produced by Angular's sanitizer.
+    expect(component.flarumUrl).toBe(bypassSpy.mock.results[0].value);
+  });
+
+  it("renders an iframe whose [src] binding is driven by flarumUrl", () => {
+    fixture.detectChanges();
+    const iframe = fixture.nativeElement.querySelector("iframe") as HTMLIFrameElement | null;
+
+    expect(iframe).not.toBeNull();
+    // We don't assert on the concrete URL string — DomSanitizer's serialised
+    // output is an implementation detail. We just check that the binding fired.
+    expect(iframe!.hasAttribute("src")).toBe(true);
+  });
+});