public void ShouldThrowExceptionIfDenominatorIsZeroWhenAdding()
{
Fraction fraction1 = new Fraction(3, 6);
Fraction fraction2 = new Fraction(2, 0);
Assert.Throws<FractionException>(() => _service.Add(fraction1, fraction2));
}
public static FractionModel Map(Fraction domain)
{
return new FractionModel
{
Numerator = domain.Numerator,
Denominator = domain.Denominator
};
}
public Fraction Pow(Fraction fraction, int power)
{
if (_operationsServiceHelper.IsFractionValid(fraction))
{
Fraction pow = _operations.Pow(fraction, power);
return _operationsServiceHelper.Normalize(pow);
}
throw new FractionException("Fraction is NaN as Denominator is 0.");
}
public Fraction Mul(Fraction fraction1, Fraction fraction2)
{
if (_operationsServiceHelper.IsFractionValid(fraction1) &&
_operationsServiceHelper.IsFractionValid(fraction2))
{
Fraction prod = _operations.Mul(fraction1, fraction2);
return _operationsServiceHelper.Normalize(prod);
}
throw new FractionException("Fraction is NaN as Denominator is 0.");
}
public void SetUp()
{
_model = new FractionModel
{
Numerator = 3,
Denominator = 7
};
_domain = new Fraction(5, 17);
}
public Fraction Sub(Fraction fraction1, Fraction fraction2)
{
if (_operationsServiceHelper.IsFractionValid(fraction1) &&
_operationsServiceHelper.IsFractionValid(fraction2))
{
Fraction diff = _operations.Sub(fraction1, fraction2);
return _operationsServiceHelper.Normalize(diff);
}
throw new FractionException("Fraction is NaN as Denominator is 0.");
}
public void ShouldSubtract2PositiveFractions()
{
_fraction1 = new Fraction(3, 4);
_fraction2 = new Fraction(2, 3);
var diff = _operations.Sub(_fraction1, _fraction2);
Assert.IsNotNull(diff);
Assert.AreEqual(1, diff.Numerator);
Assert.AreEqual(12, diff.Denominator);
}
public Fraction Div(Fraction fraction1, Fraction fraction2)
{
if (_operationsServiceHelper.IsFractionValid(fraction1) &&
_operationsServiceHelper.IsFractionValid(fraction2))
{
Fraction div = _operations.Div(fraction1, fraction2);
if (_operationsServiceHelper.IsFractionValid(div))
return _operationsServiceHelper.Normalize(div);
throw new FractionException("Result is NaN as Denominator is 0.");
}
throw new FractionException("Fraction is NaN as Denominator is 0.");
}
public void ShouldAdd2PositiveFractions()
{
_fraction1 = new Fraction(3, 4);
_fraction2 = new Fraction(2, 3);
var sum = _operations.Add(_fraction1, _fraction2);
Assert.IsNotNull(sum);
Assert.AreEqual(17, sum.Numerator);
Assert.AreEqual(12, sum.Denominator);
}
public Fraction Normalize(Fraction fraction)
{
if (fraction.Numerator == 0 || fraction.Denominator == 0)
{
return new Fraction(0,1);
}
var gcd = GCD(Math.Abs(fraction.Numerator), Math.Abs(fraction.Denominator));
var numerator = Math.Abs(fraction.Numerator) / gcd;
var denominator = Math.Abs(fraction.Denominator) / gcd;
if (fraction.IsNegative)
return new Fraction(-numerator, denominator);
return new Fraction(numerator, denominator);
}
public void ShouldAdd1NegativeAnd1PostiveFractions()
{
_fraction1 = new Fraction(3, -7);
_fraction2 = new Fraction(2, 3);
var sum = _operations.Add(_fraction1, _fraction2);
Assert.IsNotNull(sum);
Assert.AreEqual(5, sum.Numerator);
Assert.AreEqual(21, sum.Denominator);
Assert.AreEqual(false, sum.IsNegative);
}
public void ShouldAdd2NegativeFractions()
{
_fraction1 = new Fraction(-3, 4);
_fraction2 = new Fraction(2, -3);
var sum = _operations.Add(_fraction1, _fraction2);
Assert.IsNotNull(sum);
Assert.AreEqual(-17, sum.Numerator);
Assert.AreEqual(12, sum.Denominator);
Assert.AreEqual(true, sum.IsNegative);
}
public void ShouldSubtract2Fractions()
{
Fraction fraction1 = new Fraction(3, 4);
Fraction fraction2 = new Fraction(2, 3);
_helper.Expect(helper => helper.IsFractionValid(Arg<Fraction>.Is.Anything)).Return(true);
_operations.Expect(operation => operation.Sub(fraction1, fraction2)).Return(new Fraction(1, 12));
_helper.Expect(helper => helper.Normalize(Arg<Fraction>.Is.Anything)).Return(new Fraction(1, 12));
var diff = _service.Sub(fraction1, fraction2);
_operations.VerifyAllExpectations();
_helper.VerifyAllExpectations();
Assert.IsNotNull(diff);
Assert.AreEqual(1, diff.Numerator);
Assert.AreEqual(12, diff.Denominator);
Assert.AreEqual(false, diff.IsNegative);
}
public void ShouldAdd2Fractions()
{
Fraction fraction1 = new Fraction(3, 4);
Fraction fraction2 = new Fraction(2, 3);
_helper.Expect(helper => helper.IsFractionValid(Arg<Fraction>.Is.Anything)).Return(true);
_operations.Expect(operation => operation.Add(fraction1, fraction2)).Return(new Fraction(17, 12));
_helper.Expect(helper => helper.Normalize(Arg<Fraction>.Is.Anything)).Return(new Fraction(17, 12));
var sum = _service.Add(fraction1, fraction2);
_operations.VerifyAllExpectations();
_helper.VerifyAllExpectations();
Assert.IsNotNull(sum);
Assert.AreEqual(17, sum.Numerator);
Assert.AreEqual(12, sum.Denominator);
Assert.AreEqual(false, sum.IsNegative);
}
public void ShouldDivide1NegativeAnd1PostiveFractions()
{
_fraction1 = new Fraction(3, -7);
_fraction2 = new Fraction(2, 3);
var div = _operations.Div(_fraction1, _fraction2);
Assert.IsNotNull(div);
Assert.AreEqual(-9, div.Numerator);
Assert.AreEqual(14, div.Denominator);
Assert.AreEqual(true, div.IsNegative);
}
public void ShouldDivide2NegativeFractions()
{
_fraction1 = new Fraction(-3, 4);
_fraction2 = new Fraction(2, -3);
var div = _operations.Div(_fraction1, _fraction2);
Assert.IsNotNull(div);
Assert.AreEqual(9, div.Numerator);
Assert.AreEqual(8, div.Denominator);
Assert.AreEqual(false, div.IsNegative);
}
public void ShouldMultiply1NegativeAnd1PostiveFractions()
{
_fraction1 = new Fraction(3, -7);
_fraction2 = new Fraction(2, 3);
var prod = _operations.Mul(_fraction1, _fraction2);
Assert.IsNotNull(prod);
Assert.AreEqual(-6, prod.Numerator);
Assert.AreEqual(21, prod.Denominator);
Assert.AreEqual(true, prod.IsNegative);
}
public void ShouldMultiply2NegativeFractions()
{
_fraction1 = new Fraction(-3, 4);
_fraction2 = new Fraction(2, -3);
var prod = _operations.Mul(_fraction1, _fraction2);
Assert.IsNotNull(prod);
Assert.AreEqual(6, prod.Numerator);
Assert.AreEqual(12, prod.Denominator);
Assert.AreEqual(false, prod.IsNegative);
}
public void ShouldDivide2FractionsAndNormalize()
{
Fraction fraction1 = new Fraction(3, 6);
Fraction fraction2 = new Fraction(2, 8);
_helper.Expect(helper => helper.IsFractionValid(Arg<Fraction>.Is.Anything)).Return(true);
_operations.Expect(operation => operation.Div(fraction1, fraction2)).Return(new Fraction(24, 12));
_helper.Expect(helper => helper.Normalize(Arg<Fraction>.Is.Anything)).Return(new Fraction(2, 1));
var div = _service.Div(fraction1, fraction2);
_operations.VerifyAllExpectations();
_helper.VerifyAllExpectations();
Assert.IsNotNull(div);
Assert.AreEqual(2, div.Numerator);
Assert.AreEqual(1, div.Denominator);
Assert.AreEqual(false, div.IsNegative);
}
public bool IsFractionValid(Fraction fraction)
{
return fraction.Denominator != 0;
}
public void ShouldPowerFractionAndNormalize()
{
Fraction fraction1 = new Fraction(2, 4);
_helper.Expect(helper => helper.IsFractionValid(Arg<Fraction>.Is.Anything)).Return(true);
_operations.Expect(operation => operation.Pow(fraction1, 3)).Return(new Fraction(8, 64));
_helper.Expect(helper => helper.Normalize(Arg<Fraction>.Is.Anything)).Return(new Fraction(1, 8));
var pow = _service.Pow(fraction1, 3);
_operations.VerifyAllExpectations();
_helper.VerifyAllExpectations();
Assert.IsNotNull(pow);
Assert.AreEqual(1, pow.Numerator);
Assert.AreEqual(8, pow.Denominator);
Assert.AreEqual(false, pow.IsNegative);
}
public void ShouldThrowExceptionIfDenominatorIsZeroWhenDividingByZero()
{
Fraction fraction1 = new Fraction(3, 6);
Fraction fraction2 = new Fraction(0, 1);
var fraction = new Fraction(3, 0);
_helper.Expect(helper => helper.IsFractionValid(fraction1)).Return(true);
_helper.Expect(helper => helper.IsFractionValid(fraction2)).Return(true);
_helper.Expect(helper => helper.IsFractionValid(fraction)).Return(false);
_operations.Expect(operation => operation.Div(Arg<Fraction>.Is.Anything, Arg<Fraction>.Is.Anything))
.Return(fraction);
Assert.Throws<FractionException>(() => _service.Div(fraction1, fraction2));
_operations.VerifyAllExpectations();
}
public void ShouldNegativePowerPositiveFraction()
{
_fraction1 = new Fraction(3, 4);
var pow = _operations.Pow(_fraction1, -2);
Assert.IsNotNull(pow);
Assert.AreEqual(16, pow.Numerator);
Assert.AreEqual(9, pow.Denominator);
}
public static bool IsNegative(Fraction fraction)
{
if (fraction.Numerator < 0 && fraction.Denominator > 0 || fraction.Numerator > 0 && fraction.Denominator < 0)
return true;
return false;
}
public void ShouldSubtract1NegativeAnd1PostiveFractions()
{
_fraction1 = new Fraction(3, -7);
_fraction2 = new Fraction(2, 3);
var sum = _operations.Sub(_fraction1, _fraction2);
Assert.IsNotNull(sum);
Assert.AreEqual(-23, sum.Numerator);
Assert.AreEqual(21, sum.Denominator);
Assert.AreEqual(true, sum.IsNegative);
}
public void ShouldThrowExceptionIfDenominatorIsZeroWhenExponentiating()
{
Fraction fraction = new Fraction(2, 0);
Assert.Throws<FractionException>(() => _service.Pow(fraction, 3));
}
public void ShouldMultiply2FractionsAndNormalize()
{
Fraction fraction1 = new Fraction(3, 6);
Fraction fraction2 = new Fraction(2, 8);
_helper.Expect(helper => helper.IsFractionValid(Arg<Fraction>.Is.Anything)).Return(true);
_operations.Expect(operation => operation.Mul(fraction1, fraction2)).Return(new Fraction(6, 48));
_helper.Expect(helper => helper.Normalize(Arg<Fraction>.Is.Anything)).Return(new Fraction(1, 8));
var prod = _service.Mul(fraction1, fraction2);
_operations.VerifyAllExpectations();
_helper.VerifyAllExpectations();
Assert.IsNotNull(prod);
Assert.AreEqual(1, prod.Numerator);
Assert.AreEqual(8, prod.Denominator);
Assert.AreEqual(false, prod.IsNegative);
}