rattler-build build panics when test.python.python_version match spec is invalid

[travishathaway]

What happened?

While trying to build a rattler-build recipe, I received the following error:

thread 'main' panicked at src/package_test/run_test.rs:511:26:
called `Result::unwrap()` on an `Err` value: InvalidVersionAndBuild("==.*")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

This was due to an invalid match spec in the testing section of my recipe. Here's what that looked like:

tests:
  - python:
      imports:
        - my_package
      python_version: ["${{ python_min ~ '.*' }}", "3.12.*"]

The python_version section was generating an invalid match spec.

How to recreate

First, create this recipe (recipe.yaml):

package:
  name: test
  version: 0.1.0

build:
  script:
    - echo "test" > test.txt

requirements:
  build:
    - python

tests:
  - python:
      imports:
        - time
      python_version: "=.*"

Then try to build it:

rattler-build build 

It should spit out the panic error.

What should be done?

I think it would be nice to trigger a better looking error than just having the program panic. Maybe something that could try to hint at which line of the recipe.yaml that should be changed?