mockall | A powerful mock object library for Rust | Mock library
kandi X-RAY | mockall Summary
kandi X-RAY | mockall Summary
Mock objects are a powerful technique for unit testing software. A mock object is an object with the same interface as a real object, but whose responses are all manually controlled by test code. They can be used to test the upper and middle layers of an application without instantiating the lower ones, or to inject edge and error cases that would be difficult or impossible to create when using the full stack. Statically typed languages are inherently more difficult to mock than dynamically typed languages. Since Rust is a statically typed language, previous attempts at creating a mock object library have had mixed results. Mockall incorporates the best elements of previous designs, resulting in it having a rich feature set with a terse and ergonomic interface. Mockall is written in 100% safe and stable Rust.
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QUESTION
I'm trying to do some TDD with rust and I have to add a simple abstraction to make the code agnostic for multiple "backends". The backends need an init function for setup (they perform a connection to an external system), but I'm not sure how to test all of this. I thought about doing it in a functional way, with a trait Backend with the init function so a struct that implements it returns a new version of itself initialized.
...ANSWER
Answered 2022-Apr-07 at 11:14Why return Self when you may just update it in-place?
QUESTION
I'm experimenting with Rocket, Rust and SQLx and I'd like to test what happens when two parallel transactions try to insert a duplicated record on my table.
My insert fn contains nothing special and it works fine:
...ANSWER
Answered 2022-Apr-04 at 16:05You can use a async_std::future::timeout or tokio::time::timeout. Example using async_std:
QUESTION
Suppose the following example:
...ANSWER
Answered 2021-May-20 at 07:15You can use a Checkpoint for that:
QUESTION
I'm strictly trying to mock the std::path::PathBuf.is_dir method, but I think there is a more generic use case here where really this is about mocking an external feature.
I've created a trait that encapsulates the PathBuf.is_dir method which theoretically, according to the mockall documentation should enable me to mock my is_dir encapsulation.
ANSWER
Answered 2020-Apr-08 at 09:57Unfortunately, what you are doing won't work, at least in the way you want. #[automock] is creating a struct called MockPathInterface. You can then pass that type into functions that expect something that implements a PathInterface. It cannot change the behaviour of existing structs that implement that trait, at least, not directly. You do set up the MockPathInterface correctly in your tests, but there is nothing associating it with the PackageFileInfoData, so it never gets used.
One way you can do this is my modifying your code to pass the behaviour around, and then you can pass your mocked behaviour in. For example:
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Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
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