public void SimplePeek(string data)
{
var sut = new StringTextSource(data);
var result = (char)sut.Peek();
Assert.Equal(data, char.ToString(result));
Assert.Equal(0, sut.Offset);
Assert.Equal(1, sut.Line);
Assert.Equal(1, sut.Column);
}
public void WhenRead_ExpectCharacterIsReturnedAndConsumed()
{
// Given that there is text to be read
// When Read is called
// Then the next available character is returned
// And the character is consumed
using (var sut = new StringTextSource("abc"))
{
var read = (char)sut.Read();
Assert.Equal('a', read);
// Verify behavior by peeking at the next character
var peek = (char)sut.Peek();
Assert.NotEqual('a', peek);
}
}
public void WhenReadWithBuffer_ExpectTextIsReturnedAndConsumed()
{
// Given that there is text to be read
// When Read is called
// Then the buffer contains the text
// And the text is consumed
using (var sut = new StringTextSource(Sentence))
{
var buffer = new char[Sentence.Length];
var len = sut.Read(buffer, 0, buffer.Length);
Assert.Equal(buffer.Length, len);
Assert.Equal(Sentence.ToCharArray(), buffer);
// Verify behavior by peeking at the next character
Assert.Equal(-1, sut.Peek());
}
}
public void WhenReadWithBufferBiggerThanTextSource_ExpectResultLessThanBufferSize()
{
// Given that there is text to be read
// When Read is called with a buffer
// And the buffer length is larger than the length of the text
// Then the buffer contains the text
// And the returned length is less than the length of the buffer
// And the text is consumed
using (var sut = new StringTextSource(Sentence))
{
var buffer = new char[Sentence.Length * 2];
var len = sut.Read(buffer, 0, buffer.Length);
Assert.Equal(Sentence.Length, len);
Assert.Equal(Sentence.ToCharArray(), buffer.Take(len));
// Verify behavior by peeking at the next character
Assert.Equal(-1, sut.Peek());
}
}
public void EmptyData()
{
// Given that there is a text source
// and the text length is 0
// and the current offset is 0
// and the current line is 1
// and the current column is 1
// When Peek is called
// Then the result is -1
// and the current offset is 0
// and the current line is 1
// and the current column is 1
var sut = new StringTextSource("");
Assert.Equal(-1, sut.Peek());
Assert.Equal(0, sut.Offset);
Assert.Equal(1, sut.Line);
Assert.Equal(1, sut.Column);
}