A-OK

aok is a library for simplifying the assertions of complex dictionary returns, which can be used within Python code or loaded via YAML files.

import aok

import my_application


def test_call():
    """Should return the expected dictionary from my application call."""
    result: dict = my_application.get_family("Jane Doe")
    ok = aok.Okay({
        "mother": {
            "age": aok.greater_or_equal(50),
            "full_name": aok.like("* Doe"),
        },
        "father": {
            "age": aok.greater_or_equal(50),
            "full_name": aok.like("* Doe"),
        },
        "younger_brother": {
            "age": aok.less(10),
            "full_name": aok.like("* Doe"),
        }
    })
    
    # Dictionary "result" must be an exact match with the ok expected values.
    ok.assert_all(result)

    # Dictionary "result" is asserted against ok expected values as a subset, such
    # that other keys/values may exist within the "result" structure.
    ok.assert_subset(result)

The same thing can be archived from a YAML file:

ok: !aok
  mother:
    age: !aok.greater_or_equal 50
    full_name: !aok.like '* Doe'
  father:
    age: !aok.greater_or_equal 50
    full_name: !aok.like '* Doe'
  younger_brother:
    age: !aok.less 10
    full_name: !aok.like '* Doe'

and this can be loaded into a test:

import aok
import yaml
import pathlib

import my_application


def test_call():
    """Should return the expected dictionary from my application call."""
    result: dict = my_application.get_family("Jane Doe")
    data: dict = yaml.full_load(pathlib.Path("expectations.yaml").read_text())
    ok: aok.Okay = data["ok"]
    ok.assert_all(result)

It is also possible to do a comparison on lists with aok.OkayList and the !aok_list class replacing the aok.Okay and !aok values like shown in the example above.

The available comparators are:

• aok.anything() will always succeed, no matter what the observed value is.
• aok.between(min, max) must be greater than or equal to min and less than or equal to the specified min and max values. This can be a numeric or string value.
• aok.equals(value) must be an exact match between the values.
• aok.unequals(value) must not be equal to the expected value.
• aok.greater(value) must be greater than the specified value.
• aok.greater_or_equal(value) must be greater than or equal to the specified value.
• aok.less(value) must be less than the specified value.
• aok.less_or_equal(value) must be less than or equal to the specified value.
• aok.contains(string_value) must be a string that contains the specified substring exactly.
• aok.not_contains(string_value) must be a string that does not contain the exact specified string value.
• aok.like(string_value) string compares against case-insensitive, unix-shell-style wildcard expressions, e.g. "foo*" would match "foo-bar".
• aok.not_like(string_vlaue) string compares against case-insensitive, unix-shell-style wildcard expressions, e.g. "bar", and expects not to find a match.
• aok.like_case(string_value) string compares against case-sensitive, unix-shell-style wildcard expressions, e.g. "Foo*" would match "Foo-Bar".
• aok.match(string_regex_pattern) matches the string against the specified regex pattern.
• aok.not_null(value) must not be null/None, but can be anything else.
• aok.optional(value) must equal the specified value or be null/None.
• aok.one_of(value) must match one of the values in the specified list. Any of the
• aok.none_of(value) must not match one of the values in the specified list. Any of the list items can also be a comparator that will be negated.
• aok.json_dict(dict) parses a JSON-serialized string attribute and compares it to the dictionary/object in the same fashion as the !aok root object.
• aok.json_list(list) parses a JSON-serialized string attribute nad compares it to the list object in the same fashion as the !aok_list root object.