diff --git a/packages/angular_devkit/build_angular/src/dev-server/deploy-url_spec.ts b/packages/angular_devkit/build_angular/src/dev-server/deploy-url_spec.ts
deleted file mode 100644
index 125b8cd05a..0000000000
--- a/packages/angular_devkit/build_angular/src/dev-server/deploy-url_spec.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-import { Architect, BuilderRun } from '@angular-devkit/architect';
-import { DevServerBuilderOutput } from '@angular-devkit/build-angular';
-import fetch from 'node-fetch'; // tslint:disable-line:no-implicit-dependencies
-import { createArchitect, host } from '../test-utils';
-
-
-describe('Dev Server Deploy Url', () => {
-  const target = { project: 'app', target: 'serve' };
-  let architect: Architect;
-  let runs: BuilderRun[] = [];
-
-  beforeEach(async () => {
-    await host.initialize().toPromise();
-    architect = (await createArchitect(host.root())).architect;
-    runs = [];
-  });
-  afterEach(async () => {
-    await host.restore().toPromise();
-    await Promise.all(runs.map(r => r.stop()));
-  });
-
-  it('works', async () => {
-    const run = await architect.scheduleTarget(target, { deployUrl: 'test/' });
-    runs.push(run);
-    const output = await run.result as DevServerBuilderOutput;
-    expect(output.success).toBe(true);
-    expect(output.baseUrl).toBe('http://localhost:4200/test');
-
-    const response = await fetch(`${output.baseUrl}/polyfills.js`);
-    expect(await response.text()).toContain('window["webpackJsonp"]');
-  }, 30000);
-});
diff --git a/packages/angular_devkit/build_angular/src/dev-server/tests/behavior/build-deploy-url_spec.ts b/packages/angular_devkit/build_angular/src/dev-server/tests/behavior/build-deploy-url_spec.ts
new file mode 100644
index 0000000000..16b52a7df1
--- /dev/null
+++ b/packages/angular_devkit/build_angular/src/dev-server/tests/behavior/build-deploy-url_spec.ts
@@ -0,0 +1,33 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import { serveWebpackBrowser } from '../../index';
+import { executeOnceAndFetch } from '../execute-fetch';
+import { BASE_OPTIONS, DEV_SERVER_BUILDER_INFO, describeBuilder, setupBrowserTarget } from '../setup';
+
+describeBuilder(serveWebpackBrowser, DEV_SERVER_BUILDER_INFO, (harness) => {
+  describe('Behavior: "browser builder deployUrl"', () => {
+    beforeEach(() => {
+      setupBrowserTarget(harness, {
+        deployUrl: 'test/',
+      });
+    });
+
+    it('uses the deploy URL defined in the "browserTarget" options as the serve path', async () => {
+      harness.useTarget('serve', {
+        ...BASE_OPTIONS,
+      });
+
+      const { result, response } = await executeOnceAndFetch(harness, 'runtime.js');
+
+      expect(result?.success).toBeTrue();
+      expect(result?.baseUrl).toMatch(/\/test$/);
+      expect(response?.url).toMatch(/\/test\/runtime.js$/);
+      expect(await response?.text()).toContain('window["webpackJsonp"]');
+    });
+  });
+});
diff --git a/packages/angular_devkit/build_angular/src/dev-server/tests/execute-fetch.ts b/packages/angular_devkit/build_angular/src/dev-server/tests/execute-fetch.ts
index 8d8b9d8aa2..4525fb558c 100644
--- a/packages/angular_devkit/build_angular/src/dev-server/tests/execute-fetch.ts
+++ b/packages/angular_devkit/build_angular/src/dev-server/tests/execute-fetch.ts
@@ -26,7 +26,7 @@ export async function executeOnceAndFetch<T>(
       mergeMap(async (executionResult) => {
         let response = undefined;
         if (executionResult.result?.success) {
-          const resolvedUrl = new URL(url, executionResult.result.baseUrl as string);
+          const resolvedUrl = new URL(url, `${executionResult.result.baseUrl}/`);
           response = await fetch(resolvedUrl, options?.request);
         }