tests and mocks #16
tests and mocks #16
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gemtechd
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gemtechd
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change your code according to the comments
and write real es6 class mocks
| this.slope = slope; | ||
| this.n = n; | ||
| if ((this.slope !== undefined && typeof (this.slope) !== 'number') || (this.n !== undefined && typeof (this.n) !== 'number')) | ||
| throw Error('this value is not a number') |
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which parameter is not a number?
| this.y = y; | ||
| constructor({ x = 0, y = 0 } = {}) { | ||
| if (typeof (x) !== "number" || typeof (y) !== "number") | ||
| throw Error("this value is not a number") |
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who is not a number, the x or the y?
| return distance; | ||
| } | ||
| else | ||
| throw Error("this point is not a Point") |
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which parameter is not a point
and it will be good if I would be noticed if a parameter in undefined
| if (line1.n === line2.n) { | ||
| return true | ||
| if (line1 instanceof Line && line2 instanceof Line) { | ||
| if (line1.slope === line2.slope) { |
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Is the slope already calculated?
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I didn't realize the slope is already calculated
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It doesn't have to be
it can be undefined
| return junctionPoint | ||
| } | ||
| else | ||
| throw Error("this line is not a Line") |
|
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||
| describe('Line', () => { | ||
| const mockConstructorLine = jest.fn(constructor); | ||
| const mockConstructorPoint = jest.fn(constructor); |
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this is not mocking a class only a constructor function
| expect(() => new Line({ slope: { t: 5 } })).toThrow('this value is not a number') | ||
| expect(() => new Line({ n: "vbg" })).toThrow('this value is not a number') | ||
| expect(() => new Line({ n: [8] })).toThrow('this value is not a number') | ||
| expect(() => new Line({ n: { i: 5 } })).toThrow('this value is not a number') |
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change your errors in the code, and change the tests
| point.moveVertical(5); | ||
| expect(point.y).toBe(10); | ||
| point.moveVertical(-3); | ||
| expect(point.y).toBe(7); |
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what is the AAA methodology?
work according it
| describe('geometry-calculation', () => { | ||
| const mockConstructorLine = jest.fn(constructor) | ||
| const mockConstructorPoint = jest.fn(constructor) | ||
|
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this is not how to mock a class, only a constructor.
you could have written only one mockFunction for the constructor,
it could have been used for all constructors: line, point and more
write real mocks for a class
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Is this a correct direction for mock, or does it not even come close?
const mockPoint = {
x: 0,
y: 0,
moveVertical: sinon.stub().callsFake((value) => {
console.log(value);
return mockPoint.y + value;
}),
moveHorizontal: sinon.stub().callsFake((value) => {
return mockPoint.x + value;
})
};
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don't use the sinon object to mock
use jest.mock('module', ()=>{})
there are a few ways
search build mock tests with jest, mock es6 class with jest, mock partial class es6 jest, __esmodule
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