1 files changed, 45 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_edit-property-remove_04.js b/devtools/client/inspector/rules/test/browser_rules_edit-property-remove_04.js
new file mode 100644
index 0000000000..0d9915285c
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+++ b/devtools/client/inspector/rules/test/browser_rules_edit-property-remove_04.js
@@ -0,0 +1,45 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that removing the only declaration from a rule and unselecting then re-selecting
+// the element will not restore the removed declaration. Bug 1512956
+
+const TEST_URI = `
+  <style type='text/css'>
+  #testid {
+    color: #00F;
+  }
+  </style>
+  <div id='testid'>Styled Node</div>
+  <div id='empty'></div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view } = await openRuleView();
+
+  info("Select original node");
+  await selectNode("#testid", inspector);
+
+  info("Get the first property in the #testid rule");
+  const rule = getRuleViewRuleEditor(view, 1).rule;
+  const prop = rule.textProps[0];
+
+  info("Delete the property name to remove the declaration");
+  const onRuleViewChanged = view.once("ruleview-changed");
+  await removeProperty(view, prop, false);
+  info("Wait for Rule view to update");
+  await onRuleViewChanged;
+
+  is(rule.textProps.length, 0, "No CSS properties left on the rule");
+
+  info("Select another node");
+  await selectNode("#empty", inspector);
+
+  info("Select original node again");
+  await selectNode("#testid", inspector);
+
+  is(rule.textProps.length, 0, "Still no CSS properties on the rule");
+});