stdout / stderr

Check what a CLI command printed to the terminal. Programs have two output streams: stdout (standard output) for normal messages and stderr (standard error) for errors and warnings.

stdout

# Check that stdout contains a substring
assertions:
  - stdout:
      contains: "migrated successfully"

# Check that stdout matches exactly
assertions:
  - stdout:
      equals: "Hello World\n"

stderr

# Check for a warning in error output
assertions:
  - stderr:
      contains: "warning"

# Assert that stderr is empty (no errors)
assertions:
  - stderr:
      equals: ""

contains vs equals: Use contains to check for a substring anywhere in the output. Use equals when the entire output must match exactly. In most cases, contains is more resilient to minor formatting changes.

Only works with executor: cli tests.