[FR] Whitespace + line-terminator insensitive String comparison

[GavinRay97]

It's often the case that when comparing strings, you don't care about whitespace or line terminators

A big headache in many projects test suites is that multiline strings are compared, but the author copy-pastes the output resulting in OS-specific line terminators \n vs \r.

Also, outside of formatting tools, you generally don't care whether the whitespace is different between texts, only the content

I suggest a new function, something like:

infix fun strikt.api.Assertion.Builder<String>.isEqualToIgnoringWhitespace(
    expected: String
): strikt.api.Assertion.Builder<String> {
    val expectedNormalized = expected.filterNot { it.isWhitespace() }
    return assert("contains %s (ignoring whitespace)", expectedNormalized) {
        val actualNormalized = it.filterNot { it.isWhitespace() }
        if (actualNormalized == expectedNormalized) {
            pass(actual = actualNormalized)
        } else {
            fail(actual = actualNormalized)
        }
    }
}