public void ShouldThrowParseExceptionForWrongOperator()
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When - Then
var ex = Assert.Throws <ParseException>(() => calculator.Perform("5 4 *"));
Assert.That(ex.Message, Is.EqualTo("Operator wasn't found."));
}
public void ShouldThrowParseExceptionForWrongSyntax()
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When - Then
var ex = Assert.Throws <ParseException>(() => calculator.Perform("5 +"));
Assert.That(ex.Message, Is.EqualTo("Invalid expression."));
}
public void ShouldCalculateComplexExpression()
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When
double result = calculator.Perform("4 5 + 2 - 1 +");
//Then
Assert.That(result, Is.EqualTo(8));
}
public void ShouldParseStringWithManySpaces()
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When
double result = calculator.Perform("4 5 +");
//Then
Assert.That(result, Is.EqualTo(9));
}
public void ShouldAddTwoNumbers(double number1, double number2, string @operator, double expectedResult)
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When
double result = calculator.Perform($"{number1} {number2} {@operator}");
//Then
Assert.That(result, Is.EqualTo(expectedResult));
}
public void ShouldCalculateAfterException()
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When
Assert.Throws <ParseException>(() => calculator.Perform("4 *"));
double result = calculator.Perform("4 2 +");
//Then
Assert.That(result, Is.EqualTo(6));
}
public void ShouldCalculateMoreThanOnce()
{
//Given
ONPCalculator calculator = new ONPCalculator(ArtmeticOperator.Add(), ArtmeticOperator.Sub());
//When
double firstCalculation = calculator.Perform("7 3 +");
double secondCalculation = calculator.Perform("7 3 -");
//Then
Assert.That(firstCalculation, Is.EqualTo(10));
Assert.That(secondCalculation, Is.EqualTo(4));
}