increase coverage

tests/src/rules/extensions.js

@@ -330,6 +330,22 @@ ruleTester.run('extensions', rule, {
       options: [ 'never', {ignorePackages: true} ],
     }),
 
+    test({
+      code: `
+        import foo from './foo.js'
+        import bar from './bar.json'
+        import Component from './Component.jsx'
+      `,
+      errors: [
+        {
+          message: 'Unexpected use of file extension "jsx" for "./Component.jsx"',
+          line: 4,
+          column: 31,
+        },
+      ],
+      options: [ 'always', {pattern: {jsx: 'never'}} ],
+    }),
+
     // export (#964)
     test({
       code: [