Integration Testing in Rust

栏目: IT技术 · 发布时间: 4年前

内容简介:PublishedWe all know testing is important. And, I hope, it might even be familiar. You’re coding away and catch yourself thinking “I should probably test this”. And before you know it you’ve mashed on your keyboard and there appearsThese are unit tests whi

Published onJoshleeb's blog

We all know testing is important. And, I hope, it might even be familiar. You’re coding away and catch yourself thinking “I should probably test this”. And before you know it you’ve mashed on your keyboard and there appears

#[cfg(test)]
mod tests {
    ...
}

These are unit tests which are super easy to setup. No added dependencies, no added tooling

But what about integration tests?

Rust supports those too, which you probably already know. They’re only slightly more involved to setup so they’re still fairly straightforward.

But there are some caveats that I personally ran into.

For one, The Rust Book explains that

each file in the tests directory is a separate crate.

Which on its own doesn’t sound too bad. But it has the implication that having code shared between your integration tests isn’t intuitive. I think it’s because the code structure goes back to the Rust 2015 edition of defining modules, using mod.rs .

And two, which is arguably the bigger issue, is that it’s not obvious how to run only all integration tests. Or only all unit tests for that matter, but we’ll get to that too.

A Better Setup

I went looking through docs and crates and eventually opened up the source for diesel-rs/diesel , which isn’t the first time it’s been a great reference.

Now it looks like diesel has a separate crate, internal to the workspace, called diesel_tests which appears to contain the integration tests. But I don’t want to setup a new crate and workspace just to extend my test suite. Instead let’s take a look at the Cargo.toml for that crate and borrow what we can borrow.

For my new crate, mycrate , I’ve setup the Cargo.toml as

[package]
name = "mycrate"
...
autotests = false

[[test]]
name = "integration"
path = "tests/lib.rs"

Specifically, we’ve added two sections .

Autotests

The autotests = false disables automatic test discovery. This sounds bad but isn’t needed because we’re manually telling Cargo where to find our tests with…

Test Target

This may look familiar if you’ve seen [[bin]] or [[example]] where we explicitly specify an additional target for Cargo to work with. This is no different. We are simply telling Cargo there’s a test target called “integration” which has an entry point at tests/lib.rs .

Single Integration Test Crate

This config solves the first caveat. We no longer have to deal with a crate per integration test file, and so the way we handle code shared between the tests is the same way we would handle sharing code in the implementation.

And everything is still in the tests directory, so no changes there either.

Running Tests

We’ve also made segmenting our tests a bit clearer.

# Run all tests
cargo test

# Run only unit tests
cargo test --lib

# Run only integration tests
cargo test --test integration

# Run only integration tests, single threaded
# (you’ll probably want this one)
cargo test --test integration -- --test-threads=1

以上就是本文的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助,也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络,本站转载出于传递更多信息之目的,版权归原作者或者来源机构所有,如转载稿涉及版权问题,请联系我们

Search User Interfaces

Search User Interfaces

Marti A. Hearst / Cambridge University Press / 2009-9-21 / USD 59.00

搜索引擎的本质是帮助用户更快、更方便、更有效地查找与获取所需信息。在不断改进搜索算法和提升性能(以技术为中心)的同时,关注用户的信息需求、搜寻行为、界面设计与交互模式是以用户为中心的一条并行发展思路。创新的搜索界面及其配套的交互机制对一项搜索服务的成功来说是至关重要的。Marti Hearst教授带来的这本新作《Search User Interfaces》即是后一条思路的研究成果,将信息检索与人......一起来看看 《Search User Interfaces》 这本书的介绍吧!

在线进制转换器
在线进制转换器

各进制数互转换器

HEX HSV 转换工具
HEX HSV 转换工具

HEX HSV 互换工具

HSV CMYK 转换工具
HSV CMYK 转换工具

HSV CMYK互换工具