为什么在伊斯坦布尔覆盖率报告中将var声明标记为缺少分支覆盖范围?
关于var声明的Jest /伊斯坦布尔单元测试分支覆盖范围
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问答
xiejian444 回答:关于var声明的Jest /伊斯坦布尔单元测试分支覆盖范围
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运算符是if...else..
条件语句。您需要测试每个分支。
例如
index.ts
:
export class SomeClass {
INCREMENT = 1;
MIN_SCALE = 2;
public zoomOut(this: any): void {
const scaleVal = this.getFloorVar() || this.INCREMENT || this.MIN_SCALE;
this.updateZoom(scaleVal);
}
public getFloorVar() {
return 0;
}
public updateZoom(scaleVal) {
console.log(scaleVal);
}
}
index.spec.ts
:
import { SomeClass } from './';
describe('SomeClass',() => {
afterEach(() => {
jest.restoreAllMocks();
});
it('should pass - 1',() => {
const instance = new SomeClass();
jest.spyOn(instance,'getFloorVar');
jest.spyOn(instance,'updateZoom');
instance.zoomOut();
expect(instance.getFloorVar).toBeCalledTimes(1);
expect(instance.updateZoom).toBeCalledWith(1);
});
it('should pass - 2','getFloorVar').mockReturnValueOnce(22);
jest.spyOn(instance,'updateZoom');
instance.zoomOut();
expect(instance.getFloorVar).toBeCalledTimes(1);
expect(instance.updateZoom).toBeCalledWith(22);
});
it('should pass - 3',() => {
const instance = new SomeClass();
instance.INCREMENT = 0;
jest.spyOn(instance,'updateZoom');
instance.zoomOut();
expect(instance.getFloorVar).toBeCalledTimes(1);
expect(instance.updateZoom).toBeCalledWith(2);
});
});
具有100个覆盖率报告的单元测试结果:
PASS src/stackoverflow/59330476/index.spec.ts (11.68s)
SomeClass
✓ should pass - 1 (30ms)
✓ should pass - 2 (3ms)
✓ should pass - 3 (2ms)
console.log src/stackoverflow/59330476/index.ts:407
1
console.log src/stackoverflow/59330476/index.ts:407
22
console.log src/stackoverflow/59330476/index.ts:407
2
----------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
----------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
index.ts | 100 | 100 | 100 | 100 | |
----------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed,1 total
Tests: 3 passed,3 total
Snapshots: 0 total
Time: 12.984s
源代码:https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/59330476