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demo-decorator.spec.ts
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demo-decorator.spec.ts
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import Demo from './index';
const mockDemoIsActive = jest.fn();
beforeEach(() => {
jest.restoreAllMocks();
});
describe('class decorated with a demo class instance', () => {
// this is our mock
class MockTestServiceCls {
add(a: number, b: number): number {
return a - b;
}
reverse(x: string): string {
return x;
}
}
const MockTestService = new MockTestServiceCls();
@Demo(MockTestService, () => mockDemoIsActive())
class MockableTestServiceCls {
add(a: number, b: number): number {
return a + b;
}
reverse(x: string): string {
return x.split('').reverse().join('');
}
alwaysOriginal(): string {
return 'the one and only';
}
}
const MockableTestService = new MockableTestServiceCls();
describe('demo mode disabled', () => {
it('should call original add function', async () => {
mockDemoIsActive.mockImplementation(() => false);
const spyOriginalTestServiceAdd = jest.spyOn(MockableTestService, 'add');
const spyMockedTestServiceAdd = jest.spyOn(MockTestService, 'add');
const result = MockableTestService.add(2, 3);
expect(result).toBe(5);
expect(spyOriginalTestServiceAdd).toBeCalledTimes(1);
expect(spyMockedTestServiceAdd).toBeCalledTimes(0);
});
it('should call original reverse function', async () => {
mockDemoIsActive.mockImplementation(() => false);
const mockTestServiceReverse = jest.spyOn(MockableTestService, 'reverse');
const mockMockedTestServiceReverse = jest.spyOn(
MockTestService,
'reverse',
);
const result = MockableTestService.reverse('hola');
expect(result).toBe('aloh');
expect(mockTestServiceReverse).toBeCalledTimes(1);
expect(mockMockedTestServiceReverse).toBeCalledTimes(0);
});
it('should call original alwaysOriginal function', async () => {
mockDemoIsActive.mockImplementation(() => false);
const mockTestServiceAlwaysOriginal = jest.spyOn(
MockableTestService,
'alwaysOriginal',
);
const result = MockableTestService.alwaysOriginal();
expect(result).toBe('the one and only');
expect(mockTestServiceAlwaysOriginal).toBeCalledTimes(1);
});
});
describe('demo mode enabled', () => {
it('should call demo add function', async () => {
mockDemoIsActive.mockImplementation(() => true);
const mockMockedTestServiceAdd = jest.spyOn(MockTestService, 'add');
const result = MockableTestService.add(2, 3);
expect(result).toBe(-1);
expect(mockMockedTestServiceAdd).toBeCalledTimes(1);
});
it('should call demo reverse function', async () => {
mockDemoIsActive.mockImplementation(() => true);
const mockMockedTestServiceReverse = jest.spyOn(
MockTestService,
'reverse',
);
const result = MockableTestService.reverse('hola');
expect(result).toBe('hola');
expect(mockMockedTestServiceReverse).toBeCalledTimes(1);
});
it('should call original alwaysOriginal function because not available in demo', async () => {
mockDemoIsActive.mockImplementation(() => true);
const mockTestServiceAlwaysOriginal = jest.spyOn(
MockableTestService,
'alwaysOriginal',
);
const result = MockableTestService.alwaysOriginal();
expect(result).toBe('the one and only');
expect(mockTestServiceAlwaysOriginal).toBeCalledTimes(1);
});
});
});
describe('class decorated with a demo object', () => {
const demoObject = {
add(a: number, b: number): number {
return 100;
},
};
@Demo(demoObject, () => mockDemoIsActive())
class MockableTestServiceCls {
add(a: number, b: number): number {
return a + b;
}
subtract(a: number, b: number): number {
return a - b;
}
}
const mockableTestServiceInstance = new MockableTestServiceCls();
describe('demo mode disabled', () => {
it('should call original add method', () => {
mockDemoIsActive.mockImplementation(() => false);
const spyOriginalTestServiceAdd = jest.spyOn(
mockableTestServiceInstance,
'add',
);
const spyMockedTestServiceAdd = jest.spyOn(demoObject, 'add');
const result = mockableTestServiceInstance.add(2, 3);
expect(result).toBe(5);
expect(spyOriginalTestServiceAdd).toBeCalledTimes(1);
expect(spyMockedTestServiceAdd).toBeCalledTimes(0);
});
it('should call original subtract method', () => {
mockDemoIsActive.mockImplementation(() => false);
const spyOriginalTestServiceAdd = jest.spyOn(
mockableTestServiceInstance,
'subtract',
);
const result = mockableTestServiceInstance.subtract(2, 3);
expect(result).toBe(-1);
expect(spyOriginalTestServiceAdd).toBeCalledTimes(1);
});
});
describe('demo mode enabled', () => {
it('should call demo add method', () => {
mockDemoIsActive.mockImplementation(() => true);
const spyOriginalTestServiceAdd = jest.spyOn(
mockableTestServiceInstance,
'add',
);
const spyMockedTestServiceAdd = jest.spyOn(demoObject, 'add');
const result = mockableTestServiceInstance.add(2, 3);
expect(result).toBe(100);
expect(spyMockedTestServiceAdd).toBeCalledTimes(1);
});
it('should call original (missing from demo) subtract method', () => {
mockDemoIsActive.mockImplementation(() => true);
const spyOriginalTestServiceAdd = jest.spyOn(
mockableTestServiceInstance,
'subtract',
);
const result = mockableTestServiceInstance.subtract(2, 3);
expect(result).toBe(-1);
expect(spyOriginalTestServiceAdd).toBeCalledTimes(1);
});
});
});
describe('demo without decorator syntax', () => {
// this is our mock
class MockTestServiceCls {
add(a: number, b: number): number {
return a - b;
}
reverse(x: string): string {
return x;
}
}
const MockTestService = new MockTestServiceCls();
class MockableTestService {
add(a: number, b: number): number {
return a + b;
}
reverse(x: string): string {
return x.split('').reverse().join('');
}
alwaysOriginal(): string {
return 'the one and only';
}
}
const MockedTestServiceCls = Demo(MockTestService, () => mockDemoIsActive())(
MockableTestService,
);
const MockedTestService = new MockedTestServiceCls();
describe('demo mode disabled', () => {
it('should call original add function', async () => {
mockDemoIsActive.mockImplementation(() => false);
const spyOriginalTestServiceAdd = jest.spyOn(MockedTestService, 'add');
const spyMockedTestServiceAdd = jest.spyOn(MockTestService, 'add');
const result = MockedTestService.add(2, 3);
expect(result).toBe(5);
expect(spyOriginalTestServiceAdd).toBeCalledTimes(1);
expect(spyMockedTestServiceAdd).toBeCalledTimes(0);
});
it('should call original reverse function', async () => {
mockDemoIsActive.mockImplementation(() => false);
const mockTestServiceReverse = jest.spyOn(MockedTestService, 'reverse');
const mockMockedTestServiceReverse = jest.spyOn(
MockTestService,
'reverse',
);
const result = MockedTestService.reverse('hola');
expect(result).toBe('aloh');
expect(mockTestServiceReverse).toBeCalledTimes(1);
expect(mockMockedTestServiceReverse).toBeCalledTimes(0);
});
it('should call original alwaysOriginal function', async () => {
mockDemoIsActive.mockImplementation(() => false);
const mockTestServiceAlwaysOriginal = jest.spyOn(
MockedTestService,
'alwaysOriginal',
);
const result = MockedTestService.alwaysOriginal();
expect(result).toBe('the one and only');
expect(mockTestServiceAlwaysOriginal).toBeCalledTimes(1);
});
});
describe('demo mode enabled', () => {
it('should call demo add function', async () => {
mockDemoIsActive.mockImplementation(() => true);
const mockMockedTestServiceAdd = jest.spyOn(MockTestService, 'add');
const result = MockedTestService.add(2, 3);
expect(result).toBe(-1);
expect(mockMockedTestServiceAdd).toBeCalledTimes(1);
});
it('should call demo reverse function', async () => {
mockDemoIsActive.mockImplementation(() => true);
const mockMockedTestServiceReverse = jest.spyOn(
MockTestService,
'reverse',
);
const result = MockedTestService.reverse('hola');
expect(result).toBe('hola');
expect(mockMockedTestServiceReverse).toBeCalledTimes(1);
});
it('should call original alwaysOriginal function because not available in demo', async () => {
mockDemoIsActive.mockImplementation(() => true);
const mockTestServiceAlwaysOriginal = jest.spyOn(
MockedTestService,
'alwaysOriginal',
);
const result = MockedTestService.alwaysOriginal();
expect(result).toBe('the one and only');
expect(mockTestServiceAlwaysOriginal).toBeCalledTimes(1);
});
});
});
describe('without decorator', () => {
const mock = {
add(a: number, b: number) {
return a - b;
},
};
class X {
public add(a: number, b: number) {
return a + b;
}
}
let demoActive = true;
const instance = new (Demo(mock, () => demoActive)(X))();
expect(instance.add(2, 3)).toBe(-1);
demoActive = false;
expect(instance.add(2, 3)).toBe(5);
});