Writing Document Tests

In addition to the help text given before, we can also provide examples that are shown in the documentation, can be run interactively in the Django interface, and get run automatically durring CI testing.

Here is the docstring from the last section expanded with a couple of tests.

from mathics.builtin.base import Builtin, String

class Hello(Builtin):
  """
  <dl>
    <dt>Hello[$person$]
    <dd>Print a "Hello" message customized for $person$.

  This is an example of how Python Builtin-Symbol documentation works.
  </dl>

  Here is our test:
  >> Hello["Rocky"]
   = Hello, Rocky!
  """
  def apply(person: String, evaluation) -> String:
    "Hello[person_String]"
        return String(f"Hello, {person.get_string_value()})!"

Here is how to run the “Hello” tests from the command line:

$ python mathics/test.py --section Hello
Testing section Hello
  1 ( 0): TEST Hello["Rocky"]

OK

Here is how this looks in the Django interface

Rendering XML help markup in Django

If you hover to the right of this test an equals sign (=) appears and if you click on that, the test copied to the main evaluation window and run.

See For For Testing for more a list of test-related markup.