Answer: Testing private method using spyOn and Jest

eggsys — Thu, 11 Aug 2022 13:16:35 +0000

May 6 '21

you can try jest.spyOn for get implementation of private method

Class

export default class Calculator {
  private Sum(a: number, b: number): number {
    let c = a + b;
    return c;
  }
}

Test

const handleErrorSpy = jest.spyOn(Calculator.prototype, 'Sum');
const getSumImplementation = handleErrorSpy.getMockImplementation();

expect(getSumImplementation(1, 2)).toEqual(3);

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Answer: Testing private method using spyOn and Jest