#assertions #tdd #bdd #cargo-toml #assert-that


A library for readable assertions in your tests

5 releases

0.2.1 Sep 18, 2023
0.1.5 May 16, 2023
0.1.4 May 10, 2023
0.1.2 Apr 12, 2022
0.1.0 Apr 11, 2022

#200 in Testing


817 lines

easy-assert crate, which will help you to create better tests

Add dependency to your Cargo.toml

assert-that = "0.2.1"

Example: NumericAssert::assert_that(actual(-1)).is_equal().to(expected(-1));

If you need custom description, or you can't implement Display trait) StringAssert::assert_that(actual_with(value, description_fucntion)) .length() .is(expected_with(5, description_fucntion));

If you need custom match:

CustomAssert::assert_that(actual(val1)) .matches_by(|a, b| a.eq(b)) .to(expected(val2));

Available assertions: NumericAssert -> is_equal, is_not_equal, is_less, is_less_or_equal, is_greater, is_greater_or_equal

StringAssert -> is_equal, is_not_equal, length, contains

BooleanAssert -> is_true, is_false

OptionAssert -> is_none, is_some, contains for now only with custom assertion or with list assertion

ListAssert -> 
    with_element_matcher ->
        is_equal_to ->
        contains ->
            in_exact_order; - [A,B,C,A,D].contains([B,C]).in_exact_order() = true/[A,B,C,A,D].contains([B,D]).in_exact_order() = false
            just_in_order; - [A,B,C,A,D].contains([B,C]).in_exact_order() = true/[A,B,C,A,D].contains([B,D]).in_exact_order() = true
        is_not_equal_to ->
            in_any_order; - At least one element should be different
            in_order; - All elements can be same, but order different
        does_not_contain ->
            all(); - All elements from expected should be missed in actual
            at_least_one(); - At least one element from expected should be missed in actual

CustomAssert -> matches_by

It is open source, feel free to submit merge requests or propose improvements.