Debugging with `bats`

Debugging your Bash code while testing with bats.

When you run Bash track tests with Bats, Bats captures both STDOUT and STDERR for output assertions.

Caution

This works locally with bats, but not in the Exercism online editor.

If you want to print debug output without affecting the test result, write it to file descriptor (fd) 3.

echo 'debug message' >&3

Bats shows output written to fd 3 during the test run, but it does not include that output in assertions such as assert_output.

Example run:

$ bats hello_world.bats
hello_world.bats
 ✓ Say Hi!
debug message
1 test, 0 failures

This is useful when you are running the tests locally.