public void ShouldUnnegateNegatedCharacterClass()
{
// Arrange
var characters = new List <RegexNode> {
new CharacterNode('a'), new CharacterNode('b'), new CharacterNode('c')
};
var characterSet = new CharacterClassCharacterSetNode(characters);
var subtractionCharacterSet = new CharacterClassCharacterSetNode(new CharacterNode('a'));
var subtraction = new CharacterClassNode(subtractionCharacterSet, false);
var characterClass = new CharacterClassNode(characterSet, subtraction, true);
var childNodes = new List <RegexNode> {
new CharacterNode('x'), characterClass, new CharacterNode('y')
};
var root = new ConcatenationNode(childNodes);
var target = new CharacterClassNegationMutator();
// Act
var result = target.ApplyMutations(characterClass, root);
// Assert
var mutation = result.ShouldHaveSingleItem();
mutation.OriginalNode.ShouldBe(characterClass);
mutation.ReplacementNode.ToString().ShouldBe("[abc-[a]]");
mutation.ReplacementPattern.ShouldBe("x[abc-[a]]y");
mutation.DisplayName.ShouldBe("Regex character class negation mutation");
mutation.Description.ShouldBe("Character class \"[^abc-[a]]\" was replaced with \"[abc-[a]]\" at offset 1.");
}
public void MutateShouldNotMutateNonCharacterClassNode()
{
// Arrange
var characterNode = new CharacterNode('a');
var root = new ConcatenationNode(characterNode);
var target = new CharacterClassNegationMutator();
// Act
var result = target.Mutate(characterNode, root);
// Assert
result.ShouldBeEmpty();
}