1 files changed, 103 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/browser/browser_max_touchpoints.js b/devtools/client/responsive/test/browser/browser_max_touchpoints.js
new file mode 100644
index 0000000000..f8c8ef55d2
--- /dev/null
+++ b/devtools/client/responsive/test/browser/browser_max_touchpoints.js
@@ -0,0 +1,103 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Verify that maxTouchPoints is updated when touch simulation is toggled.
+
+// TODO: This test should also check that maxTouchPoints is set properly on the iframe.
+// This is currently not working and should be worked on in Bug 1706066.
+
+const TEST_DOCUMENT = `doc_with_remote_iframe_and_isolated_cross_origin_capabilities.sjs`;
+const TEST_COM_URL = URL_ROOT_COM_SSL + TEST_DOCUMENT;
+
+addRDMTask(TEST_COM_URL, async function ({ ui, browser, tab }) {
+  reloadOnTouchChange(true);
+  info("Test initial value for maxTouchPoints.");
+  is(
+    await getMaxTouchPoints(browser),
+    0,
+    "navigator.maxTouchPoints is 0 when touch simulation is not enabled"
+  );
+
+  info(
+    "Test value maxTouchPoints is non-zero when touch simulation is enabled."
+  );
+  await toggleTouchSimulation(ui);
+  is(
+    await getMaxTouchPoints(browser),
+    1,
+    "navigator.maxTouchPoints should be 1 after enabling touch simulation"
+  );
+
+  info("Toggling off touch simulation.");
+  await toggleTouchSimulation(ui);
+  is(
+    await getMaxTouchPoints(browser),
+    0,
+    "navigator.maxTouchPoints should be 0 after turning off touch simulation"
+  );
+
+  info("Enabling touch simulation again");
+  await toggleTouchSimulation(ui);
+  is(
+    await getMaxTouchPoints(browser),
+    1,
+    "navigator.maxTouchPoints should be 1 after enabling touch simulation again"
+  );
+
+  info("Check maxTouchPoints override persists after reload");
+  await reloadBrowser();
+
+  is(
+    await getMaxTouchPoints(browser),
+    1,
+    "navigator.maxTouchPoints is still 1 after reloading"
+  );
+
+  info(
+    "Check that maxTouchPoints persist after navigating to a page that forces the creation of a new browsing context"
+  );
+  const previousBrowsingContextId = browser.browsingContext.id;
+
+  const waitForDevToolsReload = await watchForDevToolsReload(browser);
+  BrowserTestUtils.loadURIString(
+    browser,
+    URL_ROOT_ORG_SSL + TEST_DOCUMENT + "?crossOriginIsolated=true"
+  );
+  await waitForDevToolsReload();
+
+  isnot(
+    browser.browsingContext.id,
+    previousBrowsingContextId,
+    "A new browsing context was created"
+  );
+
+  is(
+    await getMaxTouchPoints(browser),
+    1,
+    "navigator.maxTouchPoints is still 1 after navigating to a new browsing context"
+  );
+
+  info("Check that the value is reset when closing RDM");
+  // Closing RDM trigers a reload
+  const onPageReloaded = BrowserTestUtils.browserLoaded(browser, true);
+  await closeRDM(tab);
+  await onPageReloaded;
+
+  is(
+    await getMaxTouchPoints(browser),
+    0,
+    "navigator.maxTouchPoints is 0 after closing RDM"
+  );
+
+  reloadOnTouchChange(false);
+});
+
+function getMaxTouchPoints(browserOrBrowsingContext) {
+  return ContentTask.spawn(
+    browserOrBrowsingContext,
+    null,
+    () => content.navigator.maxTouchPoints
+  );
+}