Integrate pytest-instafail functionality into the core

[staticdev]

What's the problem this feature will solve?

When you have hours of tests to run (for example thousands of integration tests) you can be able to see the logs during execution and start fixing errors.

Actually, I found a 2015 question on StackOverflow about that but no solution there worked. I tried using flags -v, -rA, -v --tb=no and also --tb=line.

Describe the solution you'd like

Have a flag to show failed test's errors while executing the tests (instead of standard after all tests were executed).

Alternative Solutions

Some of the existing flags such as -v, -rA, -v --tb=no and also --tb=line have this behavior.

[Zac-HD]

I think you want https://pypi.org/project/pytest-instafail/ ?

[staticdev]

@Zac-HD looks like so. But without having to install something just to change how is the output. Since pytest already has many options for that built-in.

[nicoddemus]

Hi @staticdev,

But without having to install something just to change how is the output

I personally think that's OK: pytest has a flexible plugin architecture for this very reason, for people to be able to implement extra functionality without adding maintenance overhead to the core. After all, using the plugin should be a simple pip install away.

Having said that, in the past we did integrate extra functionality that was implemented as a plugin into the core, so I'm renaming the title of the issue to reflect that more clearly, and changing this to a proposal. 👍

[Zac-HD]

Closing as per #12465 (comment).