test: set up basic testing workflow

.eslintrc.js

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: [require.resolve('./index.js')]
+}

index.js

@@ -1,38 +1,38 @@
 module.exports = {
   extends: [
-    require.resolve('eslint-config-airbnb-base')
+    require.resolve('eslint-config-airbnb-base'),
   ],
   settings: {
     'import/resolver': {
       // https://github.com/benmosher/eslint-plugin-import/issues/1396
       [require.resolve('eslint-import-resolver-node')]: {},
       [require.resolve('eslint-import-resolver-webpack')]: {
-        config: require.resolve('@vue/cli-service/webpack.config.js')
-      }
+        config: require.resolve('@vue/cli-service/webpack.config.js'),
+      },
     },
     'import/extensions': [
       '.js',
       '.jsx',
       '.mjs',
       '.ts',
-      '.tsx'
-    ]
+      '.tsx',
+    ],
   },
   rules: {
     'import/extensions': ['error', 'always', {
       js: 'never',
       mjs: 'never',
       jsx: 'never',
       ts: 'never',
-      tsx: 'never'
+      tsx: 'never',
     }],
     'no-param-reassign': ['error', {
       props: true,
       ignorePropertyModificationsFor: [
         'state', // for vuex state
         'acc', // for reduce accumulators
-        'e' // for e.returnvalue
-      ]
-    }]
-  }
-}
+        'e', // for e.returnvalue
+      ],
+    }],
+  },
+};

package.json

@@ -20,6 +20,9 @@
     "url": "https://github.com/vuejs/eslint-config-airbnb/issues"
   },
   "homepage": "https://github.com/vuejs/eslint-config-airbnb#readme",
+  "scripts": {
+    "test": "eslint . --no-fix"
+  },
   "dependencies": {
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-import-resolver-node": "^0.3.3",
@@ -30,5 +33,9 @@
     "@vue/cli-service": "^3.0.0 || ^4.0.0-0",
     "eslint": "^5.16.0 || ^6.1.0",
     "eslint-plugin-import": "^2.18.2"
+  },
+  "devDependencies": {
+    "@vue/cli-service": "^4.1.2",
+    "eslint": "^6.8.0"
   }
 }