Rename the test functions to adhere to the Foundry best practices

[PaulRBerg]

As suggested in the Best Practices section of the Foundry Book, and as discussed in more detail here, it is recommended to name the test functions like this:

• test_Description
• testFuzz_Description
• test_Revert[If|When]_Description
• testFork_Description
• testForkFuzz_Revert[If|When]_Description

Doing this would also make the test lintable by scopelint when the tool is production-ready.

The tests in this repo do not, however, conform to this best practice yet.