Bug 1743594 - [devtools] Fix browser_styleinspector_tooltip-background-image.js intermittent. r=jdescottes.

Differential Revision: https://phabricator.services.mozilla.com/D134130

devtools/client/inspector/shared/test/browser_styleinspector_tooltip-background-image.js

@@ -54,8 +54,16 @@ add_task(async function() {
 async function testBodyRuleView(view) {
   info("Testing tooltips in the rule view");
 
+  // XXX we have an intermittent here (Bug 1743594) where the rule view is still empty
+  // at this point. We're currently investigating what's going on and a proper way to
+  // wait in openRuleView, but for now, let's fix the intermittent by waiting until the
+  // rule view has the expected content.
+  const property = await waitFor(() =>
+    getRuleViewProperty(view, "body", "background-image")
+  );
+
   // Get the background-image property inside the rule view
-  const { valueSpan } = getRuleViewProperty(view, "body", "background-image");
+  const { valueSpan } = property;
   const uriSpan = valueSpan.querySelector(".theme-link");
 
   const previewTooltip = await assertShowPreviewTooltip(view, uriSpan);