[Feature Request] Tests: Mock system calls & expectations instead of using on local repo

[ened]

Is your feature request related to a problem? Please describe.

Running the test suite currently causes actual downloads & install commands.

Describe the solution you'd like

The test suite should run the commands against a mock shell / mock environment. Commands & their responses could be recorded, mocked & evaluated.

Additional context

This implies a bit of refactor in how fvm runs the commands.
This probably has to go through a PlatformExecutor class or similar.

That class needs a test, but it will probably suffice to test echo 123 or similar.

[leoafarias]

@ened I have a local reference flutter repo that I use as "mock" and makes things run much faster. Passing the local flutter repo as an env var FVM_GIT_CACHE. The tests run much quicker.

[ened]

@leoafarias Understood you have a local test repo.
Will this work on CI? Is this picked up simply by running flutter test?

Does the unit test actually need a repository? Wouldn't the commands be enough?

[leoafarias]

On the CI I run without the local cache since the time is not a priority. I implemented an AppContext in order to control them a bit more the tests as I get the coverage a bit higher. I do plan on creating a MockContext, that automatically creates/updates and uses a local referenced repo.

However, I am not if mocking so you don't need the repo is a good option. FVM does not work without a flutter repository. Would have to mock all flutter and git tools which are critical pieces.

[ened]

@leoafarias agree you'd had to mock all of the interfaces with the file system & tools underneath.
This would document the tool invocations and any expectations as well.

[leoafarias]

@ened I am not opposed to have a better documented interface. However it seems that this was not the purpose of the initial issue.

• Quicker tests
• Download on every test run

These are addressed by the local reference in the mock local repo.

Do you want to update the goals of the issue, I think I can get aligned on the problem with you.

[ened]

@leoafarias ok updated the title, hope that is sufficient to move on.

[leoafarias]

For future ticket reference:

• I currently implemented AppContext in order to allow for some overrides, and better mocking.
• Create abstractions mock services especially FlutterTools and GitTools

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.