public void Scan_ReturnsCorrectTokens(string input, List <ScanToken> expectedTokens)
{
CharacterScanner.Scan(input)
.Should().BeEquivalentTo(expectedTokens);
}
public void Scan_WithNullInput_Throws()
{
TestAction(() => CharacterScanner.Scan(null))
.Should().Throw <ArgumentNullException>().Where(x => x.ParamName == "input");
}