1 files changed, 67 insertions, 0 deletions
diff --git a/devtools/client/inspector/changes/test/browser_changes_copy_declaration.js b/devtools/client/inspector/changes/test/browser_changes_copy_declaration.js
new file mode 100644
index 0000000000..0f2c7f68e6
--- /dev/null
+++ b/devtools/client/inspector/changes/test/browser_changes_copy_declaration.js
@@ -0,0 +1,67 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that the Changes panel Copy Declaration context menu item will populate the
+// clipboard with the changed declaration.
+
+const TEST_URI = `
+  <style type='text/css'>
+  div {
+    color: red;
+    margin: 0;
+  }
+  </style>
+  <div></div>
+`;
+
+const EXPECTED_CLIPBOARD_REMOVED = `/* color: red; */`;
+const EXPECTED_CLIPBOARD_ADDED = `color: green;`;
+
+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 Declaration context menu item for the removed declaration"
+  );
+  const removeDecl = getRemovedDeclarations(panelDoc);
+  const addDecl = getAddedDeclarations(panelDoc);
+
+  let menu = await getChangesContextMenu(changesView, removeDecl[0].element);
+  let menuItem = menu.items.find(
+    item => item.id === "changes-contextmenu-copy-declaration"
+  );
+  await waitForClipboardPromise(
+    () => menuItem.click(),
+    () => checkClipboardData(EXPECTED_CLIPBOARD_REMOVED)
+  );
+
+  info("Hiding menu");
+  menu.hide(document);
+
+  info(
+    "Click the Copy Declaration context menu item for the added declaration"
+  );
+  menu = await getChangesContextMenu(changesView, addDecl[0].element);
+  menuItem = menu.items.find(
+    item => item.id === "changes-contextmenu-copy-declaration"
+  );
+  await waitForClipboardPromise(
+    () => menuItem.click(),
+    () => checkClipboardData(EXPECTED_CLIPBOARD_ADDED)
+  );
+});
+
+function checkClipboardData(expected) {
+  const actual = SpecialPowers.getClipboardData("text/plain");
+  return actual.trim() === expected.trim();
+}