Generate Rust tests from data files

Sometimes you just have a bunch of example data laying around and you want to make sure your code works with all of them. Some of them are probably short and sweet and could live happily as doctests, which are amazing btw. But some of them are more awkward to present in such form, because, for example, of their size or number. Typically when you have an example of how the program should behave you write an example-based unit test. [Read More]
rust  tdd  testing 

Testing tricks in Rust

Use verbs as test module names Who said that the test module needs to be named test ? Experiment with different module names, pay attention to how the test runner displays the results. A structure that I like, an example: worker.rs: // some production code here mod should{#[test]fn consume_message_from_queue(){// mock queue, create worker with that queue injected // start worker // check if queue's 'get_message' was invoked }} Cargo prints worker::should::consume_message_from_queue when running this test, which reads nicely and exposes the requirement. [Read More]
rust  tdd  testing 

Rust - controlling side effects from the test.

Rust: controlling side effects from the test. Hello and welcome to the newest episode on testing in Rust. Imagine you want to write a timestamping repository of some sorts, that will associate the timestamp of when the storage operation was invoked with the stored value. How to write it in Rust ? And more importantly - how to test it ? I would like to share a solution I found and talk a bit about how it works. [Read More]
rust  testing  tdd 

Fixing timeouts running Android integration tests

I run Android tests on CI and after having switched to Lollipop recently the integration tests wouldn’t run. Invoking androidConnectedTest gradle target always resulted in crashing with ShellCommandUnresponsiveException. Internet says that in such a case ou just need to set ADB_INSTALL_TIMEOUT. I tried to no avail. Sourcediving it is then ! A long while after that I got to this file: Device.java [Linking to master, here’s the commit hash:1cb1a4c2976b99ae53d28d7f01d975232c85f990, as I don’t seem to be able to find how to link to that hash directly] What do we see there ? [Read More]