Use ObjectMother pattern in tests

tests/Contexts/Mooc/Courses/infrastructure/FileCourseRepository.test.ts

@@ -1,17 +1,10 @@
 import { FileCourseRepository } from '../../../../../src/Contexts/Mooc/Courses/infrastructure/FileCourseRepository';
-import { Course } from '../../../../../src/Contexts/Mooc/Courses/domain/Course';
-import { CourseId } from '../../../../../src/Contexts/Mooc/Shared/domain/Courses/CourseId';
-import { CourseName } from '../../../../../src/Contexts/Mooc/Courses/domain/CourseName';
-import { CourseDuration } from '../../../../../src/Contexts/Mooc/Courses/domain/CourseDuration';
+import { CourseMother } from '../../../../Mooc/Courses/domain/CourseMother';
 
 describe('Save Course', () => {
   it('should have a course', async () => {
     const repository = new FileCourseRepository();
-    const course = new Course(
-      new CourseId('0766c602-d4d4-48b6-9d50-d3253123275e'),
-      new CourseName('name'),
-      new CourseDuration('duration')
-    );
+    const course = CourseMother.random();
 
     await repository.save(course);
   });
@@ -20,11 +13,7 @@ describe('Save Course', () => {
 describe('Search Course', () => {
   it('should return an existing course', async () => {
     const repository = new FileCourseRepository();
-    const course = new Course(
-      new CourseId('0766c602-d4d4-48b6-9d50-d3253123275e'),
-      new CourseName('name'),
-      new CourseDuration('duration')
-    );
+    const course = CourseMother.random();
 
     await repository.save(course);
 
@@ -34,6 +23,6 @@ describe('Search Course', () => {
   it('should not return a non existing course', async () => {
     const repository = new FileCourseRepository();
 
-    expect(await repository.search(new CourseId('de8c20b5-1181-415b-bb82-1f15bf1b67f1'))).toBeFalsy();
+    expect(await repository.search(CourseMother.random().id)).toBeFalsy();
   });
 });

tests/Mooc/Courses/application/CourseCreator.test.ts

@@ -0,0 +1,26 @@
+import { CourseCreator } from '../../../../src/Contexts/Mooc/Courses/application/CourseCreator';
+import { CourseMother } from '../domain/CourseMother';
+import { CreateCourseRequestMother } from './CreateCourseRequestMother';
+import { CourseRepository } from '../../../../src/Contexts/Mooc/Courses/domain/CourseRepository';
+import { Course } from '../../../../src/Contexts/Mooc/Courses/domain/Course';
+
+let repository: CourseRepository;
+let creator: CourseCreator;
+
+const createRepository = (): CourseRepository => ({ save: jest.fn(), search: jest.fn() });
+const shouldSave = (course: Course) => expect(repository.save).toHaveBeenCalledWith(course);
+
+beforeEach(() => {
+  repository = createRepository();
+  creator = new CourseCreator(repository);
+});
+
+it('should create a valid course', async () => {
+  const request = CreateCourseRequestMother.random();
+
+  const course = CourseMother.fromRequest(request);
+
+  await creator.run(request);
+
+  shouldSave(course);
+});

tests/Mooc/Courses/application/CreateCourseRequestMother.ts

@@ -0,0 +1,17 @@
+import { CreateCourseRequest } from '../../../../src/Contexts/Mooc/Courses/application/CreateCourseRequest';
+import { CourseDuration } from '../../../../src/Contexts/Mooc/Courses/domain/CourseDuration';
+import { CourseId } from '../../../../src/Contexts/Mooc/Shared/domain/Courses/CourseId';
+import { CourseName } from '../../../../src/Contexts/Mooc/Courses/domain/CourseName';
+import { CourseDurationMother } from '../domain/CourseDurationMother';
+import { CourseIdMother } from '../../Shared/domain/Courses/CourseIdMother';
+import { CourseNameMother } from '../domain/CourseNameMother';
+
+export class CreateCourseRequestMother {
+  static create(id: CourseId, name: CourseName, duration: CourseDuration): CreateCourseRequest {
+    return { id: id.value, name: name.value, duration: duration.value };
+  }
+
+  static random(): CreateCourseRequest {
+    return this.create(CourseIdMother.random(), CourseNameMother.random(), CourseDurationMother.random());
+  }
+}

tests/Mooc/Courses/domain/CourseDurationMother.ts

@@ -0,0 +1,12 @@
+import { CourseDuration } from '../../../../src/Contexts/Mooc/Courses/domain/CourseDuration';
+import { WordMother } from '../../../Shared/domain/WordMother';
+
+export class CourseDurationMother {
+  static create(value: string): CourseDuration {
+    return new CourseDuration(value);
+  }
+
+  static random(): CourseDuration {
+    return this.create(WordMother.random());
+  }
+}

tests/Mooc/Courses/domain/CourseMother.ts

@@ -0,0 +1,26 @@
+import { CourseId } from '../../../../src/Contexts/Mooc/Shared/domain/Courses/CourseId';
+import { CourseName } from '../../../../src/Contexts/Mooc/Courses/domain/CourseName';
+import { CourseDuration } from '../../../../src/Contexts/Mooc/Courses/domain/CourseDuration';
+import { Course } from '../../../../src/Contexts/Mooc/Courses/domain/Course';
+import { CreateCourseRequest } from '../../../../src/Contexts/Mooc/Courses/application/CreateCourseRequest';
+import { CourseIdMother } from '../../Shared/domain/Courses/CourseIdMother';
+import { CourseNameMother } from './CourseNameMother';
+import { CourseDurationMother } from './CourseDurationMother';
+
+export class CourseMother {
+  static create(id: CourseId, name: CourseName, duration: CourseDuration): Course {
+    return new Course(id, name, duration);
+  }
+
+  static fromRequest(request: CreateCourseRequest): Course {
+    return this.create(
+      CourseIdMother.create(request.id),
+      CourseNameMother.create(request.name),
+      CourseDurationMother.create(request.duration)
+    );
+  }
+
+  static random(): Course {
+    return this.create(CourseIdMother.random(), CourseNameMother.random(), CourseDurationMother.random());
+  }
+}

tests/Mooc/Courses/domain/CourseNameMother.ts

@@ -0,0 +1,12 @@
+import { CourseName } from '../../../../src/Contexts/Mooc/Courses/domain/CourseName';
+import { WordMother } from '../../../Shared/domain/WordMother';
+
+export class CourseNameMother {
+  static create(value: string): CourseName {
+    return new CourseName(value);
+  }
+
+  static random(): CourseName {
+    return this.create(WordMother.random());
+  }
+}

tests/Mooc/Shared/domain/Courses/CourseIdMother.ts

@@ -0,0 +1,12 @@
+import { CourseId } from '../../../../../src/Contexts/Mooc/Shared/domain/Courses/CourseId';
+import { UuidMother } from '../../../../Shared/domain/UuidMother';
+
+export class CourseIdMother {
+  static create(value: string): CourseId {
+    return new CourseId(value);
+  }
+
+  static random(): CourseId {
+    return this.create(UuidMother.random());
+  }
+}

tests/Shared/domain/MotherCreator.ts

@@ -0,0 +1,7 @@
+import * as faker from 'faker';
+
+export class MotherCreator {
+  static random(): Faker.FakerStatic {
+    return faker;
+  }
+}

tests/Shared/domain/UuidMother.ts

@@ -0,0 +1,7 @@
+import { MotherCreator } from './MotherCreator';
+
+export class UuidMother {
+  static random(): string {
+    return MotherCreator.random().random.uuid();
+  }
+}

tests/Shared/domain/WordMother.ts

@@ -0,0 +1,7 @@
+import { MotherCreator } from './MotherCreator';
+
+export class WordMother {
+  static random(): string {
+    return MotherCreator.random().lorem.word();
+  }
+}