1 files changed, 64 insertions, 0 deletions
diff --git a/devtools/client/inspector/changes/test/browser_changes_copy_rule.js b/devtools/client/inspector/changes/test/browser_changes_copy_rule.js
new file mode 100644
index 0000000000..4c2a347e8e
--- /dev/null
+++ b/devtools/client/inspector/changes/test/browser_changes_copy_rule.js
@@ -0,0 +1,64 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that the Changes panel Copy Rule button and context menu will populate the
+// clipboard with the entire contents of the changed rule, including unchanged properties.
+
+const TEST_URI = `
+  <style type='text/css'>
+  div {
+    color: red;
+    margin: 0;
+  }
+  </style>
+  <div></div>
+`;
+
+// Indentation is important. A strict check will be done against the clipboard content.
+const EXPECTED_CLIPBOARD = `
+  div {
+    color: green;
+    margin: 0;
+  }
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view: ruleView } = await openRuleView();
+  const changesView = selectChangesView(inspector);
+  const { document: panelDoc, store } = changesView;
+
+  await selectNode("div", inspector);
+  const onTrackChange = waitForDispatch(store, "TRACK_CHANGE");
+  await updateDeclaration(ruleView, 1, { color: "red" }, { color: "green" });
+  await onTrackChange;
+
+  info("Click the Copy Rule button and expect the changed rule on clipboard");
+  const button = panelDoc.querySelector(".changes__copy-rule-button");
+  await waitForClipboardPromise(
+    () => button.click(),
+    () => checkClipboardData(EXPECTED_CLIPBOARD)
+  );
+
+  emptyClipboard();
+
+  info(
+    "Click the Copy Rule context menu item and expect the changed rule on the clipboard"
+  );
+  const addDecl = getAddedDeclarations(panelDoc);
+  const menu = await getChangesContextMenu(changesView, addDecl[0].element);
+  const menuItem = menu.items.find(
+    item => item.id === "changes-contextmenu-copy-rule"
+  );
+  await waitForClipboardPromise(
+    () => menuItem.click(),
+    () => checkClipboardData(EXPECTED_CLIPBOARD)
+  );
+});
+
+function checkClipboardData(expected) {
+  const actual = SpecialPowers.getClipboardData("text/plain");
+  return actual.trim() === expected.trim();
+}