public void TryParseCharacter_ReturnsSuccessResult_WhenStringContainsValidCharacters(string input)
{
var stream = GetStringStreamFor(input);
var parser = new PrimitiveParser(_alphabet);
var result = parser.TryParseCharacter(stream);
Assert.IsTrue(result.IsSuccess);
Assert.AreEqual("U", result.Value);
}
public void TryParseCharacter_ReturnsFailureResult_WhenStringIsEmpty()
{
var stream = GetStringStreamFor("");
var parser = new PrimitiveParser(_alphabet);
var result = parser.TryParseCharacter(stream);
Assert.IsFalse(result.IsSuccess);
stream.Received(0).Pop();
}
public void TryParseCharacter_ReturnsFailureResult_WhenStringContainsOnlyEscapeCharacter()
{
var stream = GetStringStreamFor(SpecialCharacters.Escape);
var parser = new PrimitiveParser(_alphabet);
var result = parser.TryParseCharacter(stream);
Assert.IsFalse(result.IsSuccess);
stream.Received(0).Pop();
}
public void TryParseCharacter_ReturnsFailureResult_WhenStringConsistsOfEscapeCharacterAndInvalidCharacter()
{
_alphabet.IsValid(Arg.Any <string>()).Returns(x => !x[0].Equals("N"));
var stream = GetStringStreamFor($"{SpecialCharacters.Escape}N");
var parser = new PrimitiveParser(_alphabet);
var result = parser.TryParseCharacter(stream);
Assert.IsFalse(result.IsSuccess);
stream.Received(0).Pop();
}
public void TryParseCharacter_ReturnsSuccessResult_WhenStringStartsWithEscapeAndContainsOnlyValidCharacters(
string input, string expected)
{
var stream = GetStringStreamFor(input);
var parser = new PrimitiveParser(_alphabet);
var result = parser.TryParseCharacter(stream);
Assert.IsTrue(result.IsSuccess);
Assert.AreEqual(expected, result.Value);
stream.Received(2).Pop();
}
public void TryParseCharacter_ReturnsFailureResult_WhenCharacterNotValidCharacter()
{
var stream = GetStringStreamFor("a");
_alphabet.IsValid(Arg.Any <string>()).Returns(false);
var parser = new PrimitiveParser(_alphabet);
var result = parser.TryParseCharacter(stream);
Assert.IsFalse(result.IsSuccess);
_alphabet.Received(1).IsValid(Arg.Any <string>());
stream.Received(0).Pop();
}
public void TryParseCharacter_ThrowsArgumentNullException_WhenStreamIsNull()
{
var parser = new PrimitiveParser(_alphabet);
Assert.Throws <ArgumentNullException>(() => parser.TryParseCharacter(null));
}