Fix old eslint tests

Author: Hypnosphi

tests/src/rules/no-unused-modules.js

@@ -229,10 +229,11 @@ ruleTester.run('no-unused-modules', rule, {
 
 
 describe('dynamic imports', () => {
-  if (semver.satisfies(eslintPkg.version, '< 6')) {
-    this.skip();
-    return;
-  }
+  beforeEach(function () {
+    if (semver.satisfies(eslintPkg.version, '< 6')) {
+      this.skip();
+    }
+  });
 
   // test for unused exports with `import()`
   ruleTester.run('no-unused-modules', rule, {