无法实现 100% 的笑话覆盖率
Unable to Achieve 100% Jest line Coverage
我无法实现 100% 的 Jest Line 覆盖率。 Jest 在分支语句内有 return 语句的行上显示未覆盖的行。
export class Galactic {
constructor(earthAge) {
this.earthAge = earthAge;
this.mercuryAge = 0; //.24 earth years
this.venusAge = 0; //.62
this.marsAge = 0; //1.88
this.jupiterAge = 0; //11.86
this.averageLife = 65;
}
lifeExpOnMars() {
if (this.earthAge > this.averageLife) {
let surpassedYears = (this.earthAge - this.averageLife) * 1.88;
return Math.floor(surpassedYears);
} else {
let remainingYears = this.averageLife - this.earthAge;
return Math.floor(remainingYears * 1.88);
}
}
}
我在函数中的第一个 return 语句没有显示 Jest 覆盖,因为该代码不是 运行 因为我通过第一个 if 语句传递的输入不正确。第二个 return 语句显示为已覆盖,因为这是实际被 return 编辑的代码,因为第一个 if 语句基于我输入的 earthAge 小于 averageLife 而为假。
我需要帮助来弄清楚我可以编写一个涵盖第一个 return 语句的测试,因为它不需要执行,因为不满足条件。
参考测试:
describe('Galactic', function(){
let galacticAge;
beforeEach(function(){
galacticAge = new Galactic(25)
test('return life expectancy on Mars', function(){
expect(galacticAge.lifeExpOnMars()).toEqual(75);
});
在每个测试用例中用不同的参数实例化Galactic
。让if
条件语句变为真。
index.js
:
export class Galactic {
constructor(earthAge) {
this.earthAge = earthAge;
this.mercuryAge = 0; //.24 earth years
this.venusAge = 0; //.62
this.marsAge = 0; //1.88
this.jupiterAge = 0; //11.86
this.averageLife = 65;
}
lifeExpOnMars() {
if (this.earthAge > this.averageLife) {
let surpassedYears = (this.earthAge - this.averageLife) * 1.88;
return Math.floor(surpassedYears);
} else {
let remainingYears = this.averageLife - this.earthAge;
return Math.floor(remainingYears * 1.88);
}
}
}
index.test.js
:
import { Galactic } from './';
describe('68264949', () => {
it('should cover if branch', () => {
const galactic = new Galactic(100);
const actual = galactic.lifeExpOnMars();
expect(actual).toEqual(65);
});
it('should cover else branch', () => {
const galactic = new Galactic(25);
const actual = galactic.lifeExpOnMars();
expect(actual).toEqual(75);
});
});
单元测试结果:
PASS examples/68264949/index.test.js (10.509 s)
68264949
✓ should cover if branch (2 ms)
✓ should cover else branch
----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files | 100 | 100 | 100 | 100 |
index.js | 100 | 100 | 100 | 100 |
----------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 12.1 s
Ran all test suites related to changed files.
我无法实现 100% 的 Jest Line 覆盖率。 Jest 在分支语句内有 return 语句的行上显示未覆盖的行。
export class Galactic {
constructor(earthAge) {
this.earthAge = earthAge;
this.mercuryAge = 0; //.24 earth years
this.venusAge = 0; //.62
this.marsAge = 0; //1.88
this.jupiterAge = 0; //11.86
this.averageLife = 65;
}
lifeExpOnMars() {
if (this.earthAge > this.averageLife) {
let surpassedYears = (this.earthAge - this.averageLife) * 1.88;
return Math.floor(surpassedYears);
} else {
let remainingYears = this.averageLife - this.earthAge;
return Math.floor(remainingYears * 1.88);
}
}
}
我在函数中的第一个 return 语句没有显示 Jest 覆盖,因为该代码不是 运行 因为我通过第一个 if 语句传递的输入不正确。第二个 return 语句显示为已覆盖,因为这是实际被 return 编辑的代码,因为第一个 if 语句基于我输入的 earthAge 小于 averageLife 而为假。
我需要帮助来弄清楚我可以编写一个涵盖第一个 return 语句的测试,因为它不需要执行,因为不满足条件。
参考测试:
describe('Galactic', function(){
let galacticAge;
beforeEach(function(){
galacticAge = new Galactic(25)
test('return life expectancy on Mars', function(){
expect(galacticAge.lifeExpOnMars()).toEqual(75);
});
在每个测试用例中用不同的参数实例化Galactic
。让if
条件语句变为真。
index.js
:
export class Galactic {
constructor(earthAge) {
this.earthAge = earthAge;
this.mercuryAge = 0; //.24 earth years
this.venusAge = 0; //.62
this.marsAge = 0; //1.88
this.jupiterAge = 0; //11.86
this.averageLife = 65;
}
lifeExpOnMars() {
if (this.earthAge > this.averageLife) {
let surpassedYears = (this.earthAge - this.averageLife) * 1.88;
return Math.floor(surpassedYears);
} else {
let remainingYears = this.averageLife - this.earthAge;
return Math.floor(remainingYears * 1.88);
}
}
}
index.test.js
:
import { Galactic } from './';
describe('68264949', () => {
it('should cover if branch', () => {
const galactic = new Galactic(100);
const actual = galactic.lifeExpOnMars();
expect(actual).toEqual(65);
});
it('should cover else branch', () => {
const galactic = new Galactic(25);
const actual = galactic.lifeExpOnMars();
expect(actual).toEqual(75);
});
});
单元测试结果:
PASS examples/68264949/index.test.js (10.509 s)
68264949
✓ should cover if branch (2 ms)
✓ should cover else branch
----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files | 100 | 100 | 100 | 100 |
index.js | 100 | 100 | 100 | 100 |
----------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 12.1 s
Ran all test suites related to changed files.