================================================================================
Simple assert statement
================================================================================
assert 100
--------------------------------------------------------------------------------

(source_file
  (assert_statement
    (literal
      (int_literal))))

================================================================================
Simple assert statement with condition
================================================================================
assert a > b
--------------------------------------------------------------------------------

(source_file
  (assert_statement
    (binary_expression
      (reference_expression
        (identifier))
      (reference_expression
        (identifier)))))

================================================================================
Assert statement with message
================================================================================
assert a > b, 'a should be greater than b'
--------------------------------------------------------------------------------

(source_file
  (assert_statement
    (binary_expression
      (reference_expression
        (identifier))
      (reference_expression
        (identifier)))
    (literal
      (interpreted_string_literal))))
