public void GetHashCode_returns_hash_of_simplified_fraction(Fraction sut,
ISimplifiesFraction simplifier,
long integer,
long numerator,
long denominator,
bool negative)
{
Fraction.Simplifier = simplifier;
var expected = new Fraction(integer, numerator, denominator, negative);
Mock.Get(simplifier).Setup(x => x.Simplify(sut, false)).Returns(expected);
int expectedHashCode;
// This is the expected algorithm to use, although it depends upon the runtime's mechanism
// for getting the hash codes of the four component values.
unchecked
{
expectedHashCode = (integer.GetHashCode() * 137)
^ (numerator.GetHashCode() * 137)
^ (denominator.GetHashCode() * 137)
^ (negative.GetHashCode() * 137);
}
Assert.That(() => sut.GetHashCode(), Is.EqualTo(expectedHashCode));
}
public void Simplify_uses_simplification_service(ISimplifiesFraction simplifier,
Fraction fraction,
Fraction expected)
{
Fraction.Simplifier = simplifier;
Mock.Get(simplifier).Setup(x => x.Simplify(It.IsAny <Fraction>(), It.IsAny <bool>())).Returns(expected);
Assert.That(() => fraction.Simplify(), Is.EqualTo(expected));
}
public void Simplify_passes_correct_parameters_to_service(ISimplifiesFraction simplifier,
Fraction fraction,
bool vulgar,
Fraction expected)
{
Fraction.Simplifier = simplifier;
Mock.Get(simplifier).Setup(x => x.Simplify(It.IsAny <Fraction>(), It.IsAny <bool>())).Returns(expected);
fraction.Simplify();
Mock.Get(simplifier).Verify(x => x.Simplify(fraction, vulgar), Times.Once);
}
/// <summary>
/// Resets the internal services which are used by the <see cref="Fraction"/> class for
/// parsing, simplification and formatting.
/// </summary>
internal static void ResetServices()
{
Parser = new FractionParser();
Simplifier = new FractionSimplifier();
Formatter = new FractionFormatter(Simplifier);
}
/// <summary>
/// Initializes a new instance of the <see cref="FractionFormatter"/> class.
/// </summary>
/// <param name="simplifier">A service which simplifies fractions.</param>
public FractionFormatter(ISimplifiesFraction simplifier = null)
{
this.simplifier = simplifier ?? new FractionSimplifier();
}
