Test for missing keys

Added lodash
Added a test that fails if the number of keys in one language file doesn't match the number in the other.
Will spit out the extra keys if it fails.

package.json

@@ -48,6 +48,7 @@
     "eslint-plugin-vue": "^5.0.0",
     "fibers": "^3.1.1",
     "jest-transform-stub": "^2.0.0",
+    "lodash": "^4.17.11",
     "sass": "^1.17.2",
     "sass-loader": "^7.1.0",
     "ts-jest": "^23.0.0",

tests/unit/i18n.spec.ts

@@ -0,0 +1,27 @@
+
+import en from "@/plugins/en.json";
+import fr from "@/plugins/fr.json";
+import _ from "lodash";
+
+const enKeys = Object.keys(en);
+const frKeys = Object.keys(fr);
+
+describe("i18n", () => {
+  it("should have identical keys", () => {
+    const val = _.difference(enKeys, frKeys);
+    const enIntersection = _.intersection(enKeys, val);
+    const mek = enIntersection.join("\n")
+    const frIntersection = _.intersection(frKeys, val);
+    const mfk  = frIntersection.join("\n");
+
+    console.log(`
+extra keys in en.json
+${mek}
+extra keys in fr.json
+${mfk}`);
+
+    expect(Object.keys(val).length).toBe(0);
+  });
+
+
+});