fix tests, move most errors to shared code

common/script/api-v3/errors.js

@@ -1,9 +1,37 @@
-import CustomError from './customError';
+// Base class for custom application errors
+// It extends Error and capture the stack trace
+export class CustomError extends Error {
+  constructor () {
+    super();
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+// We specify an httpCode for all errors so that they can be used in the API too
 
 export class NotAuthorized extends CustomError {
   constructor (customMessage) {
     super();
     this.name = this.constructor.name;
+    this.httpCode = 401;
     this.message = customMessage || 'Not authorized.';
   }
 }
+
+export class BadRequest extends CustomError {
+  constructor (customMessage) {
+    super();
+    this.name = this.constructor.name;
+    this.httpCode = 400;
+    this.message = customMessage || 'Bad request.';
+  }
+}
+
+export class NotFound extends CustomError {
+  constructor (customMessage) {
+    super();
+    this.name = this.constructor.name;
+    this.httpCode = 404;
+    this.message = customMessage || 'Not found.';
+  }
+}