1 files changed, 99 insertions, 0 deletions
diff --git a/devtools/client/inspector/shared/test/browser_styleinspector_refresh_when_style_changes.js b/devtools/client/inspector/shared/test/browser_styleinspector_refresh_when_style_changes.js
new file mode 100644
index 0000000000..9b92e65c07
--- /dev/null
+++ b/devtools/client/inspector/shared/test/browser_styleinspector_refresh_when_style_changes.js
@@ -0,0 +1,99 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that the rule and computed views refresh when style changes that impact the
+// current selection occur.
+// This test does not need to worry about the correctness of the styles and rules
+// displayed in these views (other tests do this) but only cares that they do catch the
+// change.
+
+const TEST_URI = TEST_URL_ROOT + "doc_content_style_changes.html";
+
+const TEST_DATA = [
+  {
+    target: "#test",
+    className: "green-class",
+    force: true,
+  },
+  {
+    target: "#test",
+    className: "green-class",
+    force: false,
+  },
+  {
+    target: "#parent",
+    className: "purple-class",
+    force: true,
+  },
+  {
+    target: "#parent",
+    className: "purple-class",
+    force: false,
+  },
+  {
+    target: "#sibling",
+    className: "blue-class",
+    force: true,
+  },
+  {
+    target: "#sibling",
+    className: "blue-class",
+    force: false,
+  },
+];
+
+add_task(async function () {
+  const tab = await addTab(TEST_URI);
+
+  const { inspector } = await openRuleView();
+  await selectNode("#test", inspector);
+
+  info("Run the test on the rule-view");
+  await runViewTest(inspector, tab, "rule");
+
+  info("Switch to the computed view");
+  const onComputedViewReady = inspector.once("computed-view-refreshed");
+  selectComputedView(inspector);
+  await onComputedViewReady;
+
+  info("Run the test again on the computed view");
+  await runViewTest(inspector, tab, "computed");
+});
+
+async function runViewTest(inspector, tab, viewName) {
+  for (const { target, className, force } of TEST_DATA) {
+    info(
+      (force ? "Adding" : "Removing") +
+        ` class ${className} on ${target} and expecting a ${viewName}-view refresh`
+    );
+
+    await toggleClassAndWaitForViewChange(
+      { target, className, force },
+      inspector,
+      tab,
+      `${viewName}-view-refreshed`
+    );
+  }
+}
+
+async function toggleClassAndWaitForViewChange(
+  whatToMutate,
+  inspector,
+  tab,
+  eventName
+) {
+  const onRefreshed = inspector.once(eventName);
+
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [whatToMutate],
+    function ({ target, className, force }) {
+      content.document.querySelector(target).classList.toggle(className, force);
+    }
+  );
+
+  await onRefreshed;
+  ok(true, "The view was refreshed after the class was changed");
+}