/
calc.test.ts
88 lines (68 loc) · 2.46 KB
/
calc.test.ts
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import Memory from '../memory';
import sub from '../sub';
import sum from '../sum';
import makeCalc from '../calc';
jest.mock('../memory');
jest.mock('../sub');
jest.mock('../sum');
const mockSub = sub as jest.MockedFunction<typeof sub>;
const mockSum = sum as jest.MockedFunction<typeof sum>;
const MockMemory = Memory as jest.MockedClass<typeof Memory>;
describe('calc - mocks', () => {
const memory = new MockMemory();
it('returns result from subtract', () => {
mockSub.mockReturnValueOnce(0);
const calc = makeCalc(memory);
const result = calc('Sub', [2, 2]);
expect(result).toEqual(0);
expect(mockSub).toBeCalledWith(2, 2);
});
it('returns result from sum', () => {
mockSum.mockReturnValueOnce(2);
const calc = makeCalc(memory);
const result = calc('Sum', [1, 1]);
expect(result).toEqual(2);
expect(mockSum).toBeCalledWith(1, 1);
});
it('adds last result to memory', () => {
MockMemory.prototype.add.mockImplementationOnce(x => x);
mockSum.mockReturnValueOnce(2);
const calc = makeCalc(memory);
const sumResult = calc('Sum', [1, 1]);
const memoryResult = calc('MemoryAdd', []);
expect(sumResult).toEqual(2);
expect(memoryResult).toEqual(2);
expect(MockMemory.prototype.add).toBeCalledWith(2);
});
it('subtracts last result to memory', () => {
MockMemory.prototype.subtract.mockImplementationOnce(x => x);
mockSum.mockReturnValueOnce(2);
const calc = makeCalc(memory);
const sumResult = calc('Sum', [1, 1]);
const memoryResult = calc('MemorySub', []);
expect(sumResult).toEqual(2);
expect(memoryResult).toEqual(2);
expect(MockMemory.prototype.subtract).toBeCalledWith(2);
});
it('clears the memory', () => {
MockMemory.prototype.add.mockImplementationOnce(x => x);
mockSum.mockReturnValueOnce(2).mockReturnValueOnce(4);
const calc = makeCalc(memory);
const sumResult = calc('Sum', [1, 1]);
const memoryResult = calc('MemoryAdd', []);
const sumResult2 = calc('Sum', [2, 2]);
const clearResult = calc('MemoryClear', []);
expect(sumResult).toEqual(2);
expect(memoryResult).toEqual(2);
expect(sumResult2).toEqual(4);
expect(clearResult).toEqual(4);
expect(MockMemory.prototype.reset).toBeCalledTimes(1);
});
it('throws an error when invalid Op is passed', () => {
const calc = makeCalc(memory);
// @ts-expect-error
expect(() => calc('Multiply', [2, 3])).toThrowError(
new Error('Invalid op'),
);
});
});