How to pass command line arguments to a TEST_CASE

I read how to parse command line options: [here](../blob/devel/docs/own-main.md). However, I could not figure out how to use this inside a `TEST_CASE`. For example, how do I use the value of `height` in that example in a test? Also, is there any way to create a test case without using the `TEST_CASE` macro?