How can I see print() statements in behave (BDD)

Ben picture Ben · Aug 6, 2014 · Viewed 22.3k times · Source

Context: I am using Python with Behave (BDD).

Whether I run my tests from the command line (behave) or from a custom main(), the behavior is the same: the test runs and the only output that I see in the console is the standard BDD report.

My tests include print() statements that help me debug my code. However, none of these print statements are being displayed in the console output when I run behave.

Is there any way we can have "behave" display the print statements in our code?

My Main()

config = Configuration()
if not config.format:
    default_format = config.defaults["default_format"]
    config.format = [ default_format ]
    config.verbose = True
r = runner.Runner(config)
r.run()

if config.show_snippets and r.undefined_steps:
    print_undefined_step_snippets(r.undefined_steps)

My test.feature file:

Feature: My test feature with the Behave BDD
    Scenario: A simple test
    Given you are happy
    When someone says hi
    Then you smile

My test_steps.py file:

from behave import given, when, then, step, model

@given('you are happy')
def step_impl(context):
    pass

@when ('someone says {s}')
def step_impl(context, s):
    context.message = s
    print("THIS IS NEVER DISPLAYED IN THE CONSOLE")
    pass

@then ('you smile')
def step_impl(context):
        assert(context.message == "hi")

Answer

Xuan picture Xuan · Feb 16, 2015

from command line, you can use the following:

--no-capture for any stdout output to be printed immediately.

--no-capture-stderr for any stderr output to be printed immediately.