void NextSecond_return_second()
{
var reader = new SourceStringReader("abc");
reader.Advance();
Assert.Equal('b', reader.CurrentChar());
}
void PeekAtStart_return_first()
{
var reader = new SourceStringReader("abc");
var c = reader.CurrentChar();
Assert.Equal('a', c);
}
void PeekAfterOneNext_return_second()
{
var reader = new SourceStringReader("abc");
reader.Advance();
var c = reader.CurrentChar();
Assert.Equal('b', c);
}
void NextNonWhiteChar_at_start()
{
var reader = new SourceStringReader(" \t \r abc");
var success = reader.AdvanceUntilNonWhite();
Assert.True(success);
Assert.Equal('a', reader.CurrentChar());
}
void PeekAtTheEOF_throws()
{
var reader = new SourceStringReader("abc");
reader.Advance();
reader.Advance();
reader.Advance();
Assert.Throws <InvalidOperationException>(() => reader.CurrentChar());
}
void NextAtStart_return_first()
{
var reader = new SourceStringReader("abc");
Assert.Equal('a', reader.CurrentChar());
}