public void Validate_WhenInputISValid_ShouldReturnEmptyValidationResultList(string input)
{
// Arrange
ExpressionsValidator classUnderTest = CreateClassUnderTest();
// Act
IList <ValidationResult> result = classUnderTest.Validate(input);
// Assert
Assert.IsNotNull(result);
Assert.IsEmpty(result);
}
public void Validate_WhenInputContainsTwoOrMoreConsecutuveOperators_ShouldThrowValidationError(string input)
{
// Arrange
ExpressionsValidator classUnderTest = CreateClassUnderTest();
// Act
IList <ValidationResult> result = classUnderTest.Validate(input);
// Assert
Assert.IsNotNull(result);
Assert.IsNotEmpty(result);
Assert.AreEqual(1, result.Count);
Assert.AreEqual("Input contains two or more consecutive operators", result[0].ErrorMessage);
}
public void Validate_WhenInputIsEmptyOrIsSingleOperator_ShouldThrowValidationError(string input)
{
// Arrange
ExpressionsValidator classUnderTest = CreateClassUnderTest();
// Act
IList <ValidationResult> result = classUnderTest.Validate(input);
// Assert
Assert.IsNotNull(result);
Assert.IsNotEmpty(result);
Assert.AreEqual(1, result.Count);
Assert.AreEqual("Input must contain at least one number", result[0].ErrorMessage);
}
public void Validate_WhenInputIsEmptyOrContainsInvalidOperators_ShouldThrowValidationError(string input)
{
// Arrange
ExpressionsValidator classUnderTest = CreateClassUnderTest();
// Act
IList <ValidationResult> result = classUnderTest.Validate(input);
// Assert
Assert.IsNotNull(result);
Assert.IsNotEmpty(result);
Assert.AreEqual(1, result.Count);
Assert.AreEqual("Input can only contain digits, empty spaces and any of the operators \"+\", \"-\", \"*\" and \"/\"", result[0].ErrorMessage);
}
public void Validate_WhenInputContainsOnlyRepeatingOperators_ShouldThrowValidationErrors(string input)
{
// Arrange
ExpressionsValidator classUnderTest = CreateClassUnderTest();
// Act
IList <ValidationResult> result = classUnderTest.Validate(input);
// Assert
Assert.IsNotNull(result);
Assert.IsNotEmpty(result);
Assert.AreEqual(2, result.Count);
ValidationResult firstValidationError = result[0];
Assert.AreEqual("Input must contain at least one number", firstValidationError.ErrorMessage);
ValidationResult secondValidationError = result[1];
Assert.AreEqual("Input contains two or more consecutive operators", secondValidationError.ErrorMessage);
}