test: introduce frontend unit testing foundation (#529)

tsconfig.json

@@ -41,6 +41,9 @@
       "@styles/*": [
         "src/styles/*"
       ],
+      "@tests/*": [
+        "tests/*"
+      ],
     },
     "lib": [
       "esnext",
@@ -62,6 +65,7 @@
     "shims.d.ts",
     "src/**/*",
     "src/**/*.vue",
+    "tests/**/*.ts",
     "themeConfig.ts",
     "auto-imports.d.ts",
     "components.d.ts",
@@ -73,4 +77,4 @@
     "node_modules",
     "src/@iconify/*"
   ]
-}
+}