Angular if else在代码覆盖率报告的导入中未采用的路径

我的代码覆盖率报告显示（E）：else路径未被采用。（一） ：如果未采用路径。 在import语句和decorator的上下文中，它意味着什么？ 因此，我的代码覆盖率在任何测试中都没有达到100%。 如何纠正它？

我必须删除：

import { Component, OnInit } from '@angular/core';
import { Title } from '@angular/platform-browser';

@Com(I)ponent({
  selector: 'app-fruit-cake',(E)
  templateUrl: './fruit-cake.component.html',
  styleUrls: ['./fruit-cake.component.scss'],
})
expo(E)rt class FruitCakeComponent {
  constructor(private _title: Title) {
    _title.setTitle('Cake');
  }
}

在此之前，我添加了此功能以帮助诊断其他问题。因此，我在package.json中的测试脚本如下所示：

--sourceMap=false

"test": "ng test --code-coverage"

  "devDependencies": {
    "@angular/compiler-cli": "^6.0.3",
    "@angular-devkit/build-angular": "~0.6.8",
    "typescript": "~2.7.2",
    "@angular/cli": "~6.0.8",
    "@angular/language-service": "^6.0.3",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1"
  }

我把它改成：

"test": "ng test --code-coverage --sourceMap=false"

然后，我所有的代码覆盖都开始正确地报告。您可能还需要在package.json中验证您的devdependency。我使用的是Angular 6，因此它们看起来像这样：

--sourceMap=false

"test": "ng test --code-coverage"

  "devDependencies": {
    "@angular/compiler-cli": "^6.0.3",
    "@angular-devkit/build-angular": "~0.6.8",
    "typescript": "~2.7.2",
    "@angular/cli": "~6.0.8",
    "@angular/language-service": "^6.0.3",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1"
  }

---

对于Angular 6，您似乎需要对您的

测试
执行
“sourceMap”：true
，如下所示：

--sourceMap=false

"test": "ng test --code-coverage"

  "devDependencies": {
    "@angular/compiler-cli": "^6.0.3",
    "@angular-devkit/build-angular": "~0.6.8",
    "typescript": "~2.7.2",
    "@angular/cli": "~6.0.8",
    "@angular/language-service": "^6.0.3",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1"
  }

为什么export写得像expo（E）rt，组件写得像Com（I）Component？这来自伊斯坦布尔生成的覆盖率报告。（E） 和（I）是告诉您else路径未被采用和if路径未被采用的标记。请提供测试套件代码。请参考以下@JFPicard的答案，以了解配置此选项的最佳方法。使用“@angular devkit/build angular”：“~0.7.5”，工作正常，谢谢！