diff --git a/tests/WaitForHelper.test.ts b/tests/WaitForHelper.test.ts
index 00d5e583a..7b6ab7027 100644
--- a/tests/WaitForHelper.test.ts
+++ b/tests/WaitForHelper.test.ts
@@ -7,9 +7,33 @@
 import assert from 'node:assert';
 import {describe, it} from 'node:test';
 
+import {getNetworkMultiplierFromString} from '../src/WaitForHelper.js';
+
+import {serverHooks} from './server.js';
 import {html, withMcpContext} from './utils.js';
 
+describe('getNetworkMultiplierFromString', () => {
+  it('maps each predefined network condition to its multiplier', () => {
+    assert.strictEqual(getNetworkMultiplierFromString('Fast 4G'), 1);
+    assert.strictEqual(getNetworkMultiplierFromString('Slow 4G'), 2.5);
+    assert.strictEqual(getNetworkMultiplierFromString('Fast 3G'), 5);
+    assert.strictEqual(getNetworkMultiplierFromString('Slow 3G'), 10);
+  });
+
+  it('falls back to 1 for unknown condition strings', () => {
+    assert.strictEqual(getNetworkMultiplierFromString('2G'), 1);
+    assert.strictEqual(getNetworkMultiplierFromString('No emulation'), 1);
+    assert.strictEqual(getNetworkMultiplierFromString(''), 1);
+  });
+
+  it('falls back to 1 when no condition is set', () => {
+    assert.strictEqual(getNetworkMultiplierFromString(null), 1);
+  });
+});
+
 describe('WaitForHelper', () => {
+  const server = serverHooks();
+
   it('does not stall when an action opens a dialog without handleDialog', async () => {
     await withMcpContext(async (response, context) => {
       const mcpPage = context.getSelectedMcpPage();
@@ -43,4 +67,121 @@ describe('WaitForHelper', () => {
       assert.throws(() => mcpPage.throwIfDialogOpen());
     });
   });
+
+  it('reports navigatedToUrl when the action starts a cross-document navigation', async () => {
+    await withMcpContext(async (response, context) => {
+      const mcpPage = context.getSelectedMcpPage();
+      server.addHtmlRoute('/target.html', html`<h1>target</h1>`);
+      const targetUrl = server.getRoute('/target.html');
+
+      const result = await mcpPage.waitForEventsAfterAction(async () => {
+        await mcpPage.pptrPage.evaluate(url => {
+          // Navigate asynchronously so the evaluate call returns before the
+          // execution context is destroyed by the navigation.
+          setTimeout(() => {
+            window.location.href = url;
+          }, 0);
+        }, targetUrl);
+      });
+
+      assert.strictEqual(result.navigatedToUrl, targetUrl);
+      assert.strictEqual(result.dialogHandled, false);
+      assert.strictEqual(mcpPage.pptrPage.url(), targetUrl);
+    });
+  });
+
+  it('resolves quickly without navigatedToUrl when no navigation happens', async () => {
+    await withMcpContext(async (response, context) => {
+      const mcpPage = context.getSelectedMcpPage();
+      await mcpPage.pptrPage.setContent(html`<div id="root"></div>`);
+
+      const start = Date.now();
+      const result = await mcpPage.waitForEventsAfterAction(async () => {
+        await mcpPage.pptrPage.evaluate(() => {
+          document.querySelector('#root')!.append('done');
+        });
+      });
+      const elapsed = Date.now() - start;
+
+      assert.strictEqual(result.navigatedToUrl, undefined);
+      assert.strictEqual(result.dialogHandled, false);
+      // Expected wait is ~200ms (#expectNavigationIn 100ms + #stableDomFor
+      // 100ms). Assert we stayed below #stableDomTimeout/#navigationTimeout
+      // (3s each) to prove neither full timeout was consumed.
+      assert.ok(
+        elapsed < 2_000,
+        `expected a fast return without navigation, took ${elapsed}ms`,
+      );
+    });
+  });
+
+  it('swallows navigation timeouts and still resolves with a result', async () => {
+    await withMcpContext(async (response, context) => {
+      const mcpPage = context.getSelectedMcpPage();
+      server.addRoute('/hang.html', () => {
+        // Never respond so the started navigation cannot complete.
+      });
+      const hangUrl = server.getRoute('/hang.html');
+
+      const start = Date.now();
+      const result = await mcpPage.waitForEventsAfterAction(
+        async () => {
+          await mcpPage.pptrPage.evaluate(url => {
+            setTimeout(() => {
+              window.location.href = url;
+            }, 0);
+          }, hangUrl);
+        },
+        {timeout: 500},
+      );
+      const elapsed = Date.now() - start;
+
+      // The navigation started but timed out; the timeout error is logged and
+      // swallowed rather than thrown, and the pending navigation never
+      // committed, so the URL is unchanged and no navigatedToUrl is reported.
+      assert.strictEqual(result.navigatedToUrl, undefined);
+      assert.strictEqual(result.dialogHandled, false);
+      // Current behavior: the total wait is the 500ms navigation timeout plus
+      // the full 3s #stableDomTimeout, because the stable-DOM evaluation does
+      // not settle while the navigation is still pending (~3.5s in total).
+      // Assert an upper bound well below protocolTimeout-scale hangs.
+      assert.ok(
+        elapsed < 8_000,
+        `expected the wait to be bounded by the internal timeouts, took ${elapsed}ms`,
+      );
+
+    });
+  });
+
+  it('reports same-document hash navigations via the URL comparison', async () => {
+    await withMcpContext(async (response, context) => {
+      const mcpPage = context.getSelectedMcpPage();
+      server.addHtmlRoute('/page.html', html`<p>content</p>`);
+      const pageUrl = server.getRoute('/page.html');
+      await mcpPage.pptrPage.goto(pageUrl);
+
+      const result = await mcpPage.waitForEventsAfterAction(async () => {
+        await mcpPage.pptrPage.evaluate(() => {
+          window.location.hash = '#section';
+        });
+      });
+
+      assert.strictEqual(result.navigatedToUrl, `${pageUrl}#section`);
+      assert.strictEqual(result.dialogHandled, false);
+    });
+  });
+
+  it('rethrows errors from the action', async () => {
+    await withMcpContext(async (response, context) => {
+      const mcpPage = context.getSelectedMcpPage();
+      await mcpPage.pptrPage.setContent(html`<p>content</p>`);
+
+      await assert.rejects(
+        mcpPage.waitForEventsAfterAction(() =>
+          Promise.reject(new Error('action failed')),
+        ),
+        /action failed/,
+      );
+    });
+  });
 });