这里有些奇怪的行为。我正在使用Mocha编写单元测试,该单元测试调用将LatLng转换为小叶L.LatLng对象的Class的静态方法。在测试结束时,我正在检查返回的对象是否确实是L.LatLng的实例。令人惊讶的是,即使它确实是L.LatLng的一个实例,该测试也失败了。闲逛了几个小时后,我得以将问题缩小到以下范围。如果我通过tsconfig路径参数导入Converter类
import { LeafletConverter } from '@maps/leaflet/leaflet-converter';
然后测试失败。但是,如果我通过相对路径导入它:
import { LeafletConverter } from '../../../app/maps/leaflet/leaflet-converter';
然后测试顺利通过,没有错误。问题是,这里发生了什么,有什么方法可以保持'@maps / ...'导入样式?
版本:
$ tsc --version
Version 3.6.3
VSCode 1.39.2
测试文件:
import { expect } from 'chai';
import 'mocha';
import L from "leaflet";
import { LeafletConverter as DirectLeafletConverter } from '../../../app/maps/leaflet/leaflet-converter';
import { LeafletConverter } from '@maps/leaflet/leaflet-converter';
import { LatLng } from '@maps/lat-lng';
describe.only('maps/leaflet/asdf', () => {
it('tsconfig path import - this test fails', () => {
const leafletll = LeafletConverter.toLeafletLatLng(new LatLng(1,2));
const test = leafletll instanceof L.LatLng;
expect(test).to.be.true;
});
it('direct import - this test passes', () => {
const leafletll = DirectLeafletConverter.toLeafletLatLng(new LatLng(1,2));
const test = leafletll instanceof L.LatLng;
expect(test).to.be.true;
});
});
LeafletConverter.ts
import { LatLng } from "@maps/lat-lng";
import L from "leaflet";
import { LatLngBounds } from "@maps/lat-lng-bounds";
export abstract class LeafletConverter {
private constructor(){}
...
public static toLeafletLatLng(latLng: LatLng): L.LatLng {
let result: L.LatLng = null;
if(LatLng.isValid(latLng)) {
result = L.latLng(latLng.lat,latLng.lng);
}
return result;
}
...
}
测试命令和输出:
$ "C:\\Program Files\\nodejs\\node.exe" --inspect-brk=22915 node_modules\\mocha\\bin\\_mocha -r ts-node/register -r tsconfig-paths/register --timeout 30000 --colors C:\\Users\\Asdf\\tmp\\rm.js\\group
test/**/*.test.ts
Debugger listening on ws://127.0.0.1:22915/e1b8ec38-90ac-41dd-aded-c2c20e2ffa28
For help, see: https://nodejs.org/en/docs/inspector
Debugger attached.
maps/leaflet/asdf
1) tsconfig path import
√ direct import
1 passing (14ms)
1 failing
1) maps/leaflet/asdf
tsconfig path import:
AssertionError: expected false to be true
+ expected - actual
-false
+true
at Context.<anonymous> (C:\Users\Asdf\tmp\rm.js\group-clusterer\src\test\maps\leaflet\asdf.test.ts:16:27)
Waiting for the debugger to disconnect...
package.json
{
"name": "typescript-webpack-seed-project",
"version": "0.0.1",
"description": "",
"main": "index.js",
"scripts": {
"test": "mocha -r ts-node/register -r tsconfig-paths/register src/test/**/*.test.ts",
"compile": "npx tsc",
"cc": "npx tsc -w",
"build": "webpack"
},
"author": "",
"license": "ISC",
"devDependencies": {
"@types/chai": "^4.2.3",
"@types/googlemaps": "^3.38.0",
"@types/leaflet": "^1.5.5",
"@types/mocha": "^5.2.7",
"@types/node": "^12.12.5",
"@types/q": "^1.5.2",
"@types/rbush": "^2.0.3",
"chai": "^4.2.0",
"jsdom": "15.2.1",
"jsdom-global": "3.0.2",
"leaflet": "^1.5.1",
"mocha": "^6.2.1",
"ts-loader": "^6.2.0",
"ts-node": "^8.4.1",
"tsconfig-paths": "^3.9.0",
"tsconfig-paths-webpack-plugin": "^3.2.0",
"tslint": "^5.20.0",
"typescript": "^3.6.3",
"uglifyjs-webpack-plugin": "^2.2.0",
"webpack": "^4.41.2",
"webpack-cli": "^3.3.9"
},
"dependencies": {
"q": "^1.5.1",
"rbush": "^3.0.1"
}
}
找到了解决方案。问题的根本原因是mocha命令行命令中ts文件的绝对路径。当我修改此...
$ "C:\\Program Files\\nodejs\\node.exe" --inspect-brk=22915 node_modules\\mocha\\bin\\_mocha -r ts-node/register -r tsconfig-paths/register --timeout 30000 --colors C:\\Users\\Asdf\\tmp\\rm.js\\group-clusterer/src/test/**/*.test.ts
到此...
$ "C:\\Program Files\\nodejs\\node.exe" --inspect-brk=22915 node_modules\\mocha\\bin\\_mocha -r ts-node/register -r tsconfig-paths/register --timeout 30000 --colors src/test/**/*.test.ts
然后一切正常。为什么呢?我不知道...