Provides helpers for easy and typesafe mocking with spies

spy-helper.ts

/*
  This class provides helpers for easy and typesafe mocking with spies
*/

// get keys of type
export declare function keys<T extends object>(): Array<keyof T>;

export class SpyHelper {

  /*
    Ensures typesafe creation of a spy object
  */
  public static createSpyObj<T>(name: string = 'spyObject', methods: Array<keyof T>): jasmine.SpyObj<T> {

    return jasmine.createSpyObj<T>(name, methods);
  }

  public static createSpyObjFromObj<T>(name: string = 'spyObject', obj: T): jasmine.SpyObj<T> {

    const keysOfObject = [];

    for (const key in obj) {
      if (obj.hasOwnProperty(key)) {
        keysOfObject.push(key);
      }
    }

    return jasmine.createSpyObj<T>(name, keysOfObject);
  }
}