Evaluates if variable passed from command line is Boolean type

is_boolean_argument.robot

*** Settings ***

Documentation       Evaluates if variable passed from command line is Boolean type
...                 Requires Robot Framework version 3.2 or newer
...                 Arguments are passed for a test like this:
...                 robot --variable MY_BOOLEAN:False path/to/this/file
...                 Tests pass both for "True" and "False" and should fail for any other inputs.
*** Variables ***

${MY_BOOLEAN}       not boolean - tests fail with this

*** Test Cases ***

Variable Type Should Be Boolean
    ${is_boolean}       Evaluate  type(${MY_BOOLEAN}) == bool
    Should Be True      ${is_boolean}

Variable Type Should Be Boolean - Python Inline Evaluation
    [Documentation]  Uses Python Inline Evaluation
    ...              Testing same thing as "Variable Should Be True"
    Should Be True      ${{ type(${MY_BOOLEAN}) == bool }}