docs(ja): fix example command (#1016)

numb86 · eddyerburgh · commit cf7bd66b9d45 · 2018-11-02T17:55:18.000+09:00
diff --git a/docs/ja/guides/testing-single-file-components-with-mocha-webpack.md b/docs/ja/guides/testing-single-file-components-with-mocha-webpack.md
@@ -165,7 +165,7 @@ describe('Counter.vue', () => {
 これでテストを実行できます:
 
 ```
-npm run unit
+npm run test
 ```
 
 やったー！テストを実行している!
