jest-auto-stub

Automatically create type-safe fully stubbed instances of classes or interfaces.

Installation

``
npm install jest-auto-stub
`

Usage

`typescript
import { reveal, stub } from 'jest-auto-stub';

interface MyInterface {
foo(): string;
}

class MyClass {
bar(): string {
return 'foo';
}
}

describe('stub', () => {
describe('interface', () => {
it('will return an object', () => {
const s = stub();
expect(s).toBeDefined();
expect(s).toMatchObject({});
});

it('will track calls to stubbed methods', () => {
const s = stub();
s.foo();
expect(s.foo).toHaveBeenCalled();
});

it('will be able to provide mock results', () => {
const s = stub();

reveal(s).foo.mockReturnValueOnce('bar');

const result = s.foo();

expect(s.foo).toHaveBeenCalled();
expect(result).toBe('bar');
});
});

describe('class', () => {
it('will return an object', () => {
const s = stub();
expect(s).toBeDefined();
expect(s).toMatchObject({});
});

it('will track calls to stubbed methods', () => {
const s = stub();
s.bar();
expect(s.bar).toHaveBeenCalled();
});

it('will be able to provide mock results', () => {
const s = stub();

{
const mock = reveal(s);
mock.bar.mockReturnValueOnce('hello');
mock.bar.mockReturnValueOnce('world');
}

const result = [s.bar(), s.bar()];

expect(s.bar).toHaveBeenCalled();
expect(result[0]).toBe('hello');
expect(result[1]).toBe('world');
});
});
});
``