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chromium/third_party/blink/web_tests/synthetic_gestures/basic_pinch_zoom.html 

<!DOCTYPE html>
<script src='../resources/testharness.js'></script>
<script src='../resources/testharnessreport.js'></script>
<script src='../resources/testdriver.js'></script>
<script src='../resources/testdriver-actions.js'></script>
<script src='../resources/testdriver-vendor.js'></script>
<style>
  body, html {
    margin: 0;
    height: 10000px;
  }
</style>

<script>
  // Test that a basic pointer action sequence resulting in a pinch-zoom works
  // without crashing or DCHECK.
  window.onload = () => {
    promise_test(() => {
      assert_equals(window.visualViewport.scale, 1,
                    "PRECONDITION: Page loaded unzoomed.");
      const pinch_zoom = new test_driver.Actions()
          .setContext(window)
          .addPointer("finger1", "touch")
          .addPointer("finger2", "touch")
          .pointerMove(400, 250, {origin: "viewport", sourceName: "finger1"})
          .pointerMove(400, 350, {origin: "viewport", sourceName: "finger2"})
          .pointerDown({sourceName: "finger1"})
          .pointerDown({sourceName: "finger2"})
          .pointerMove(400, 100, {origin: "viewport", sourceName: "finger1"})
          .pointerMove(400, 500, {origin: "viewport", sourceName: "finger2"})
          .pointerUp({sourceName: "finger1"})
          .pointerUp({sourceName: "finger2"})
          .send();

      return pinch_zoom.then(() => {
        assert_greater_than(window.visualViewport.scale, 1.5,
                            "Action must have caused pinch-zoom.");
      });
    }, 'Simulated pinch-zoom with test_driver Actions API');

  }
</script>