如何解决模块导出函数的存根不起作用
我正在尝试从模块中存根导出的函数，以便我可以替换返回值并检查该函数是否已被调用。
我已经创建了一个存根，测试通过了，但不知何故在函数中没有使用存根，并且存根没有被调用一次。
index.ts
GET /users/meindex.spec.ts
import * as mqtt from 'mqtt'
/*
*/
export const setupConnection = (): mqtt.MqttClient => {
return mqtt.connect(`${someConfigAddress}:${someConfigPort}`)
}
文档中的 stub-dependency 指南也帮不了我
解决方法
确保在您的 "esModuleInterop": true 文件中设置了 tsconfig.json 并将 import * as mqtt from 'mqtt' 语句更改为 import mqtt from 'mqtt';
然后，它会正常工作。
例如
index.ts：
import mqtt from 'mqtt';
const someConfigAddress = '127.0.0.1';
const someConfigPort = 6666;
export const setupConnection = (): mqtt.MqttClient => {
return mqtt.connect(`${someConfigAddress}:${someConfigPort}`);
};
index.test.ts：
import mqtt from 'mqtt';
import * as mqttClient from './';
import sinon from 'sinon';
import { expect } from 'chai';
describe('Mqtt-Client Tests: ',() => {
it('SetupConnection() should call connect once',() => {
const connectSpy = sinon.stub(mqtt,'connect');
mqttClient.setupConnection();
expect(connectSpy.called).to.be.true;
});
});
tsconfig.json：
{
"compilerOptions": {
/* Basic Options */
"target": "ES2015" /* Specify ECMAScript target version: 'ES3' (default),'ES5','ES2015','ES2016','ES2017','ES2018' or 'ESNEXT'. */,"module": "commonjs" /* Specify module code generation: 'none','commonjs','amd','system','umd','es2015',or 'ESNext'. */,"lib": [
"ES2015","ES2016","ES2017","ES2018","ES2019","ES2020","ESNext"
] /* Specify library files to be included in the compilation. */,// "allowJs": true,/* Allow javascript files to be compiled. */
// "checkJs": true,/* Report errors in .js files. */
// "jsx": "preserve",/* Specify JSX code generation: 'preserve','react-native',or 'react'. */
// "declaration": true,/* Generates corresponding '.d.ts' file. */
// "declarationMap": true,/* Generates a sourcemap for each corresponding '.d.ts' file. */
// "sourceMap": true,/* Generates corresponding '.map' file. */
// "outFile": "./",/* Concatenate and emit output to single file. */
// "outDir": "./",/* Redirect output structure to the directory. */
// "rootDir": "./",/* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "composite": true,/* Enable project compilation */
// "removeComments": true,/* Do not emit comments to output. */
// "noEmit": true,/* Do not emit outputs. */
// "importHelpers": true,/* Import emit helpers from 'tslib'. */
// "downlevelIteration": true,/* Provide full support for iterables in 'for-of',spread,and destructuring when targeting 'ES5' or 'ES3'. */
// "isolatedModules": true,/* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
/* Strict Type-Checking Options */
// "strict": true /* Enable all strict type-checking options. */,"noImplicitAny": false /* Raise error on expressions and declarations with an implied 'any' type. */,"strictNullChecks": true /* Enable strict null checks. */,"strictFunctionTypes": true /* Enable strict checking of function types. */,"strictPropertyInitialization": true /* Enable strict checking of property initialization in classes. */,"noImplicitThis": true /* Raise error on 'this' expressions with an implied 'any' type. */,"alwaysStrict": true /* Parse in strict mode and emit "use strict" for each source file. */,/* Additional Checks */
// "noUnusedLocals": true,/* Report errors on unused locals. */
// "noUnusedParameters": true,/* Report errors on unused parameters. */
// "noImplicitReturns": true,/* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true,/* Report errors for fallthrough cases in switch statement. */
/* Module Resolution Options */
// "moduleResolution": "node",/* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
// "baseUrl": "./",/* Base directory to resolve non-absolute module names. */
// "paths": {},/* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [],/* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": ["./node_modules/@types","./types"] /* List of folders to include type definitions from. */,// "types": [] /* Type declaration files to be included in compilation. */,// "allowSyntheticDefaultImports": true,/* Allow default imports from modules with no default export. This does not affect code emit,just typechecking. */
"esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
// "preserveSymlinks": true,/* Do not resolve the real path of symlinks. */
/* Source Map Options */
// "sourceRoot": "",/* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "",/* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true,/* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true,/* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
// "experimentalDecorators": true,/* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true,/* Enables experimental support for emitting type metadata for decorators. */
}
}
测试结果：
Mqtt-Client Tests:
✓ SetupConnection() should call connect once
1 passing (4ms)
----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files | 100 | 100 | 100 | 100 |
index.ts | 100 | 100 | 100 | 100 |
----------|---------|----------|---------|---------|-------------------
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