feat(test): add jest test suite

tests/server/controller/FileController.ts

@@ -0,0 +1,18 @@
+import FileService from '../service/FileService';
+
+class FileController {
+  private service: FileService = new FileService();
+
+  upload = async (ctx) => {
+    const files = ctx.request.files.file;
+    console.log(files);
+
+    if (files.length === undefined) {
+      this.service.upload(ctx, files, false);
+    } else {
+      this.service.upload(ctx, files, true);
+    }
+  };
+}
+
+export default new FileController();