--- a/devtools/client/webconsole/new-console-output/test/components/evaluation-result.test.js
+++ b/devtools/client/webconsole/new-console-output/test/components/evaluation-result.test.js
@@ -52,25 +52,25 @@ describe("EvaluationResult component:", 
     expect(wrapper.hasClass("error")).toBe(true);
   });
 
   it("renders thrown empty string", () => {
     const message = stubPreparedMessages.get(`eval throw ""`);
     const wrapper = render(EvaluationResult({ message, serviceContainer }));
     const text = wrapper.find(".message-body").text();
     expect(text).toBe("Error");
-    expect(wrapper.find(".message.error").length).toBe(1);
+    expect(wrapper.hasClass("error")).toBe(true);
   });
 
   it("renders thrown string", () => {
     const message = stubPreparedMessages.get(`eval throw "tomato"`);
     const wrapper = render(EvaluationResult({ message, serviceContainer }));
     const text = wrapper.find(".message-body").text();
     expect(text).toBe("Error: tomato");
-    expect(wrapper.find(".message.error").length).toBe(1);
+    expect(wrapper.hasClass("error")).toBe(true);
   });
 
   it("renders an inspect command result", () => {
     const message = stubPreparedMessages.get("inspect({a: 1})");
     const wrapper = render(EvaluationResult({ message, serviceContainer }));
 
     expect(wrapper.find(".message-body").text()).toBe("Object { a: 1 }");
   });