Ceq is a custom equals check; the given function returns true if its arguments are equal.

Cneq is a custom not-equals check; the given function returns true if its arguments are equal.

Eq asserts that the given two values are equal.

Neq asserts that the given two values are not equal.

Nok asserts that the given error is not nil.

Ok asserts that the given error is nil.

Require is an assertion that logs a failure if its given argument is not true.

TestService is a very simple test service that just echos back request payloads.