Log detailed output in bats

When you unit test your bash scripts with bats and have tests like

 @test "my test" {
     result=$(
          analyze some stuff |\
          sed 's/stuff/otherstuff/' |\
          sort |\
          lot of pipe magic...
     )
     [[ $result =~ pattern ]]
 }

you will get no info if the test fails besides “[[ $result =~ pattern ]]” failed.

Here is a way to still produce some helpful output:

 @test "my test" {
     result=$(
          echo "Here is the output."
     )
     output=$result
     [[ $result =~ pattern ]]
 }
 
 teardown {
     printf "%s\n" "$output"
 }

Now for the failed test you see all the content from $result below the test failed message

✗ my test
(in test file mytest.bats, line 8)
  `[[ $result =~ pattern ]]' failed
 
Here is the output.