feat: Add tag controller test

Author: lujakob

jest.json

@@ -0,0 +1,14 @@
+{
+  "moduleFileExtensions": [
+    "ts",
+    "tsx",
+    "js",
+    "json"
+  ],
+  "transform": {
+    "^.+\\.tsx?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+  },
+  "testRegex": "/src/.*\\.(test|spec).(ts|tsx|js)$",
+  "collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],
+  "coverageReporters": ["json", "lcov"]
+}