@stryker-mutator/core/dist/test/unit/initializer/gitignore-writer.spec.js

The extendable JavaScript mutation testing framework

import os from 'os';
import fs from 'fs';
import { syncBuiltinESMExports } from 'module';
import sinon from 'sinon';
import { testInjector } from '@stryker-mutator/test-helpers';
import { expect } from 'chai';
import { GitignoreWriter } from '../../../src/initializer/gitignore-writer.js';
import { initializerTokens } from '../../../src/initializer/index.js';
const GITIGNORE_FILE = '.gitignore';
describe(GitignoreWriter.name, () => {
    let sut;
    let fsAppendFile;
    let fsExistsSync;
    let fsReadFile;
    let out;
    beforeEach(() => {
        out = sinon.stub();
        fsAppendFile = sinon.stub(fs.promises, 'appendFile');
        fsExistsSync = sinon.stub(fs, 'existsSync');
        fsReadFile = sinon.stub(fs.promises, 'readFile');
        syncBuiltinESMExports();
        sut = testInjector.injector.provideValue(initializerTokens.out, out).injectClass(GitignoreWriter);
    });
    describe('addStrykerTempFolder', () => {
        it('should check if the .gitignore file exists', async () => {
            // Act
            await sut.addStrykerTempFolder();
            // Assert
            expect(fsExistsSync).calledOnceWith(GITIGNORE_FILE);
        });
        describe('with existing .gitignore file', () => {
            beforeEach(() => {
                fsExistsSync.returns(true);
                fsReadFile.returns(Buffer.from('node_modules'));
            });
            it('should append the stryker gitignore configuration', async () => {
                // Act
                await sut.addStrykerTempFolder();
                // Assert
                expect(fsAppendFile).calledWithExactly(GITIGNORE_FILE, `${os.EOL}# stryker temp files${os.EOL}.stryker-tmp${os.EOL}`);
            });
            it('should output a message to inform the user that the .gitignore file has been changed', async () => {
                // Arrange
                fsAppendFile.resolves({});
                // Act
                await sut.addStrykerTempFolder();
                // Assert
                expect(out).calledWithExactly('Note: Your .gitignore file has been updated to include recommended git ignore patterns for Stryker');
            });
            it("should not append the stryker gitignore configuration if it's already present", async () => {
                // Arrange
                fsReadFile.returns(`node_modules${os.EOL}.stryker-tmp${os.EOL}temp`);
                // Act
                await sut.addStrykerTempFolder();
                // Assert
                expect(fsAppendFile).not.called;
            });
        });
        describe('without a .gitignore file', () => {
            beforeEach(() => {
                fsExistsSync.returns(false);
            });
            it('should output a message to inform the user to change their .gitignore file', async () => {
                // Act
                await sut.addStrykerTempFolder();
                // Assert
                expect(out).calledWithExactly('No .gitignore file could be found. Please add the following to your .gitignore file: *.stryker-tmp');
            });
        });
    });
});
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