On Monday, 21 October 2013 at 11:58:14 UTC, Jonathan M Davis wrote:
On Monday, October 21, 2013 13:48:16 Dicebot wrote:
On Monday, 21 October 2013 at 11:09:25 UTC, ilya-stromberg wrote:
> Guys, we have at least 5 (!) different unit test projects!
> Can you cooperate your efforts to create one, but wonderful?

...and add it to Phobos review queue ;)

I confess that I don't understand why anyone is creating any unit test projects for D, and I'd likely vote against any attempt to add such a thing to Phobos. D has built in unit testing functionality, and it works great. Maybe some additional assert-like functions could be useful (similar to assertThrown or assertNotThrown), but we really don't need much beyond what the language

- Jonathan m Davis

"640K ought to be enough for anybody"

Seriously though, unit testing is a major tool that all languages should have access to. The built-in stuff is adequate for very simple testing on simple types such as asserting something is true, etc. But when you're writing tests for a class that need dependencies then the built-in stuff won't cut it. The framework i'm currently working allows for mocking of dependencies which in itself is a big deal. Replacing dependencies with 'fake' stubs is something which makes unit tests a lot clearer and less complicated. It also means i can override the return value of any method at runtime to pretend returned data is real there too.

I've also extended the assert mechanism in the D runtime to create better errors. Instead of just getting:

    core.exception.AssertError@file(57): Assertion failure

You now get:

    | Failed asserting equal
    | File: file.d
    | Line: 57
    | ✓ Expected value: (int[]) [1, 2, 3, 4, 5]
    | ✗ Actual value: (int[]) [1, 2, 4, 5]

This is way more clear exactly what and where failed. This is essential when unit testing using structs, arrays, classes, etc.. as you need this information to truly narrow down exactly what failed. Extending stuff like this also helps with overall project reporting, writing to a file or drawing pretty graphs etc..

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