我已经为jest创建了一个测试环境。它非常接近于他们的官方文档 https://jestjs.io/docs/en/configuration#testenvironment-string.
我在构造函数中设置了一些值,我希望将它们提供给环境中使用的测试。 (看this.foo = bar
).
测试环境:
// my-custom-environment
const NodeEnvironment = require('jest-environment-node');
class CustomEnvironment extends NodeEnvironment {
constructor(config, context) {
super(config, context);
this.testPath = context.testPath;
this.foo = 'bar'; // Trying to access
}
async setup() {
await super.setup();
await someSetupTasks(this.testPath);
this.global.someGlobalObject = createGlobalObject();
}
async teardown() {
this.global.someGlobalObject = destroyGlobalObject();
await someTeardownTasks();
await super.teardown();
}
runScript(script) {
return super.runScript(script);
}
}
module.exports = CustomEnvironment;
我使用以下等效项运行测试:
jest --env ./tests/<testing-env>.js
我在哪里访问this.foo
在我的测试中,在这个测试环境中进行测试?
describe('Sample Test', () => {
it('this.foo = bar', () => {
expect(this.foo).toBe('bar');
});
});
我尝试用 es5 函数格式替换两个箭头函数(希望this
将在范围内)并且没有任何运气。
如何从测试环境中的测试中获取类属性?
不幸的是,你不能。我建议暴露foo
以类似的方式this.global.someGlobalObject = createGlobalObject();
并添加this.global.foo = 'bar'
内setup
功能。然后,您可以通过调用在测试套件中访问此变量foo
.
// my-custom-environment
const NodeEnvironment = require('jest-environment-node');
class CustomEnvironment extends NodeEnvironment {
constructor(config, context) {
super(config, context);
this.testPath = context.testPath;
}
async setup() {
await super.setup();
await someSetupTasks(this.testPath);
this.global.someGlobalObject = createGlobalObject();
this.global.foo = 'bar'; // <-- will make foo global in your tests
}
async teardown() {
this.global.someGlobalObject = destroyGlobalObject();
await someTeardownTasks();
await super.teardown();
}
runScript(script) {
return super.runScript(script);
}
}
module.exports = CustomEnvironment;
然后在您的测试套件中:
// test suite
describe('Sample Test', () => {
it('foo = bar', () => {
expect(foo).toBe('bar'); // <-- foo since it's globally accessible
});
});
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