chore: Add test for duplicate locale keys

test/sanity/no-duplicate-translation-keys.js

@@ -0,0 +1,27 @@
+'use strict';
+
+let glob = require('glob').sync;
+
+describe('Locales files', () => {
+  it.skip('do not contain duplicates of any keys', () => {
+    let translationFiles = glob('./common/locales/en/*.json');
+
+    if (translationFiles.length === 0) {
+      throw new Error('Could not find any files in ./common/locales/en/*.json');
+    }
+
+    let keys = {};
+
+    translationFiles.forEach((file) => {
+      let json = require(`../.${file}`); // eslint-disable-line global-require
+
+      Object.keys(json).forEach((key) => {
+        if (keys[key]) {
+          throw new Error(`${key} in ${file} already exists in ${keys[key]}.`);
+        }
+
+        keys[key] = file;
+      });
+    });
+  });
+});