Create a test to certify a clean install

[leotrs]

Originally posted by @eulertour in #9 (comment)

Basically something to dry-run a Scene, ensure that the bare minimum to render successfully is actually installed, and give a helpful error like LaTeX/FFmpeg isn't installed, media directory isn't writable, etc.

Having done this, the correct way to install manim would be pip install manim, and then pytest test_install.py. (Or the equivalent in the testing library that we end up using.)

This would flag issues about system dependencies such as latex, ffmpeg, etc.

[PgBiel]

Could probably be automated with travis or something as well

[huguesdevimeux]

As @leotrs pointed out, we will have to be aware in the tests that Latex is optional. See #11

[huguesdevimeux]

Closed since #28 #97 are on this (and more up-to-date)

[leotrs]

@huguesdevimeux While this can be done with what we currently have, I don't think this has been implemented. To clarify, I meant a "test to certify a clean install" that a user could run after installation, and it would be part of the installation instructions. So the installation instructions would have this as the last instruction: "Finally, run some_command on your terminal. If it finishes without error, then your install of manim is complete. If it shows an error, then please refer to the FAQ/Troubleshooting section".

So I guess all that's missing in order to get that is documentation.

[huguesdevimeux]

@leotrs Oh ok I see, this is a good idea.
But is your idea to do it with pytest ? If yes I think this will be implemented soon.
If not, I think that just telling the user to run SquareToCircle might be enough.
But you're totally right, at least a mention of a such command (potentially with SquareToCircle, I don't know) is missing in the Readme.

[eulertour]

I have to agree with @leotrs that this isn't finished yet, and it would ideally be something done through pytest. It'd be much better to have a command which gives clear error messages and covers as many potential pitfalls as it can than to run SquareToCircle. As an example, the latter wouldn't test latex.

[naveen521kk]

Will a batch/shell script do? Or it should be done with purest?

[leotrs]

@naveen521kk all tests should be done via pytest, as much as possible.

[huguesdevimeux]

@naveen521kk all tests should be done via pytest, as much as possible.

Hmm are you sure about that ? I mean, this test is meant to be run by a standard user, not a contributor.
I think a shell script is better as there is much more trouble to set up.

What do you think ?

[leotrs]

So in the PR I just requested (#324), there are instructions embedded in the installation instructions to certify the installation is clean. For example, after installing latex, it instructs the reader to try it out by executing latex on the console. Would this be a poor man's fix for this issue?