Fix test intermittent

src/test/unit/profile-conversion.test.js

@@ -33,7 +33,7 @@ describe('converting Google Chrome profile', function() {
   it('successfully imports', async function() {
     // Mock out image loading behavior as the screenshots rely on the Image loading
     // behavior.
-    jest
+    const spy = jest
       .spyOn(Image.prototype, 'addEventListener')
       .mockImplementation((name: string, callback: Function) => {
         if (name === 'load') {
@@ -51,5 +51,13 @@ describe('converting Google Chrome profile', function() {
       throw new Error('Unable to parse the profile.');
     }
     expect(profile).toMatchSnapshot();
+
+    // This is really odd behavior, but this spy was showing up in stack traces in
+    // an intermittent test failure. Adding this manually mock restore made the error
+    // go away. Generally spies should be removed with automatically because of the
+    // "resetMocks" configuration option.
+    //
+    // See https://github.com/facebook/jest/issues/7654
+    spy.mockRestore();
   });
 });