macro_rules! assert_contains { ($ACTUAL: expr, $EXPECTED: expr) => { ... }; }
A macro to assert that one string is contained within another with a nice error message if they are not.
Usage: assert_contains!(actual, expected)
assert_contains!(actual, expected)
Is a macro so test error messages are on the same line as the failure;
Both arguments must be convertable into Strings (Into<String>)
Into
String