[test] Fix Argos-CI flakyness (mui#12142)

Author: oliviertassinari

test/regressions/TestViewer.js

@@ -27,29 +27,15 @@ const styles = theme => ({
   },
 });
 
-class TestViewer extends React.Component {
-  getChildContext() {
-    return {
-      url: {
-        pathname: '/',
-      },
-    };
-  }
+function TestViewer(props) {
+  const { children, classes } = props;
 
-  render() {
-    const { children, classes } = this.props;
-
-    return <div className={classes.root}>{children}</div>;
-  }
+  return <div className={classes.root}>{children}</div>;
 }
 
 TestViewer.propTypes = {
   children: PropTypes.node.isRequired,
   classes: PropTypes.object.isRequired,
 };
 
-TestViewer.childContextTypes = {
-  url: PropTypes.object,
-};
-
 export default withStyles(styles)(TestViewer);

test/regressions/index.js

@@ -81,6 +81,10 @@ vrtest.before(() => {
       google: {
         families: ['Roboto:300,400,500', 'Material+Icons'],
       },
+      custom: {
+        families: ['Font Awesome 5 Free:400,900'],
+        urls: ['https://use.fontawesome.com/releases/v5.1.0/css/all.css'],
+      },
       timeout: 20000,
       active: () => {
         resolve('active');