1 files changed, 63 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_add-property-and-reselect.js b/devtools/client/inspector/rules/test/browser_rules_add-property-and-reselect.js
new file mode 100644
index 0000000000..d71af090cf
--- /dev/null
+++ b/devtools/client/inspector/rules/test/browser_rules_add-property-and-reselect.js
@@ -0,0 +1,63 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that adding properties to rules work and reselecting the element still
+// show them.
+
+const TEST_URI = URL_ROOT + "doc_content_stylesheet.html";
+
+add_task(async function () {
+  await addTab(TEST_URI);
+  const { inspector, view } = await openRuleView();
+  await selectNode("#target", inspector);
+
+  info("Setting a font-weight property on all rules");
+  await setPropertyOnAllRules(view, inspector);
+
+  info("Reselecting the element");
+  await selectNode("body", inspector);
+  await selectNode("#target", inspector);
+
+  checkPropertyOnAllRules(view);
+});
+
+async function setPropertyOnAllRules(view, inspector) {
+  // Set the inline style rule first independently because it needs to wait for specific
+  // events and the DOM mutation that it causes refreshes the rules view, so we need to
+  // get the list of rules again later.
+  info("Adding font-weight:bold in the inline style rule");
+  const inlineStyleRuleEditor = view._elementStyle.rules[0].editor;
+
+  const onMutation = inspector.once("markupmutation");
+  const onRuleViewRefreshed = view.once("ruleview-refreshed");
+
+  inlineStyleRuleEditor.addProperty("font-weight", "bold", "", true);
+
+  await Promise.all([onMutation, onRuleViewRefreshed]);
+
+  // Now set the other rules after having retrieved the list.
+  const allRules = view._elementStyle.rules;
+
+  for (let i = 1; i < allRules.length; i++) {
+    info(`Adding font-weight:bold in rule ${i}`);
+    const rule = allRules[i];
+    const ruleEditor = rule.editor;
+
+    const onRuleViewChanged = view.once("ruleview-changed");
+
+    ruleEditor.addProperty("font-weight", "bold", "", true);
+
+    await onRuleViewChanged;
+  }
+}
+
+function checkPropertyOnAllRules(view) {
+  for (const rule of view._elementStyle.rules) {
+    const lastProperty = rule.textProps[rule.textProps.length - 1];
+
+    is(lastProperty.name, "font-weight", "Last property name is font-weight");
+    is(lastProperty.value, "bold", "Last property value is bold");
+  }
+}