[英]How to test TaskEither form fp-ts with jest
I am new to fp-ts.我是 fp-ts 的新手。 Let's say I have a function
(path: string) => TaskEither<Erorr, T>
which reads and parses config, and I want to write a test for that.假设我有一个函数
(path: string) => TaskEither<Erorr, T>
读取和解析配置,我想为此编写一个测试。
So far I have:到目前为止,我有:
test('Read config', done => {
interface Config {
fld1: string
fld2: {
fld: 3
}
}
pipe(
readConfig<Config>("resources/test-config.toml"),
TE.fold(
err => T.of(done(err)),
toml => T.of(() => {
expect(toml).toBe({})
done()
})
)
)
})
But it fails due to timeout.但是由于超时而失败。 And also I am unsure if I implemented fold correctly.
而且我不确定我是否正确实现了折叠。 How do fold
TaskEither
to Task
in general and then call it asynchronously?通常如何将
TaskEither
折叠到Task
然后异步调用它?
I was missing function call.我错过了函数调用。
It should have been:它应该是:
pipe(
readConfig<Config>("resources/test-config.toml"),
TE.fold(
err => T.of(done(err)),
toml => T.of(() => {
expect(toml).toBe({})
done()
})
)
)()
This post was the only I found when I was looking how to test TaskEither with jest, so here is my answer:这篇文章是我在寻找如何用 jest 测试 TaskEither 时发现的唯一一篇文章,所以这是我的答案:
import * as TE from "fp-ts/lib/TaskEither";
import * as E from "fp-ts/lib/Either";
it("tests TaskEither", async () => {
const fn = TE.right("something");
await expect(fn()).resolves.toStrictEqual(E.right("something"));
})
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