1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_imported_stylesheet_edit.js b/devtools/client/inspector/rules/test/browser_rules_imported_stylesheet_edit.js
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+++ b/devtools/client/inspector/rules/test/browser_rules_imported_stylesheet_edit.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+const TEST_URI = URL_ROOT_SSL + "doc_rules_imported_stylesheet_edit.html";
+const SJS_URI = URL_ROOT_SSL + "sjs_imported_stylesheet_edit.sjs";
+/**
+ * Test that imported stylesheets are correctly handled by the inspector after
+ * being updated.
+ * The inspector used to retrieve an outdated version of the stylesheet text,
+ * which triggered many issues: outdated values, blank panels etc...
+ *
+ * This test involves an imported CSS which is generated by a sjs file.
+ * Using sjs here allows us to simulate an "update" of a stylesheet while still
+ * fetching the same URL, which closely matches what a developer would experience
+ * when manually editing a stylesheet in an IDE before reloading a page.
+ */
+add_task(async function () {
+  info("Call `?setup` on the test sjs");
+  await fetch(SJS_URI + "?setup");
+
+  info("Add the test tab, open the rule-view and select the test node");
+  await addTab(TEST_URI);
+
+  const { inspector, view } = await openRuleView();
+
+  await selectNode("div", inspector);
+  const redColorProp = getTextProperty(view, 1, { color: "red" });
+  ok(redColorProp, "RuleView displays a color:red property");
+
+  // The "?update-stylesheet" call will change the CSS returned by sjs_imported_stylesheet_edit.sjs:
+  // - some rules are added before the matching `div {}` rule
+  // - the value of the `color` property changes
+  info("Call `?update-stylesheet` on the test sjs");
+  await fetch(SJS_URI + "?update-stylesheet");
+
+  info("Reload the page to restore the initial state");
+  await navigateTo(TEST_URI);
+
+  info("Wait until a rule is displayed at index 1");
+  await waitFor(() => view.element.children[1]);
+
+  info("Check that the displayed rule has been correctly updated.");
+  const goldColorProp = getTextProperty(view, 1, { color: "gold" });
+  ok(goldColorProp, "RuleView displays a color:gold property");
+});