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

Add dependency to your Cargo.toml [dev-dependencies] assert-that = "0.1.5"

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 -> length; with_element_matcher -> is_equal_to -> in_any_order; in_order contains -> in_any_order; 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 CustomAssert -> matches_by

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