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namespace Simple.Data.UnitTest
{
using System;
using NUnit.Framework;
[TestFixture]
public class MaybeTest
{
[Test]
public void MaybeNoneShouldBeFalse()
{
Assert.False(Maybe<int>.None.HasValue);
}
[Test]
public void MaybeSomeShouldBeTrue()
{
Assert.True(Maybe<int>.Some(1).HasValue);
}
[Test]
public void IteratorShouldRun()
{
int n = 0;
Func<Maybe<int>> iterator = () => ++n < 10 ? n : Maybe<int>.None;
Maybe<int> maybe;
while ((maybe = iterator()).HasValue)
{
Assert.AreEqual(n, maybe.Value);
}
Assert.False(maybe.HasValue);
}
[Test]
public void NoneOfSameTypeShouldBeEqual()
{
Assert.AreEqual(Maybe<int>.None, Maybe<int>.None);
}
[Test]
public void NoneOfDifferentTypeShouldNotBeEqual()
{
Assert.AreNotEqual(Maybe<int>.None, Maybe<long>.None);
}
[Test]
public void NoneValueIsDefault()
{
Assert.AreEqual(default(int), Maybe<int>.None.Value);
Assert.IsNull(Maybe<object>.None.Value);
}
[Test]
public void NoneToStringIsEmptyString()
{
Assert.AreEqual(string.Empty, Maybe<int>.None.ToString());
}
[Test]
public void SomeEqualityTrueTest()
{
var first = Maybe.Some(42);
var second = Maybe.Some(42);
Assert.IsTrue(first == second);
}
[Test]
public void SomeEqualityFalseTest()
{
var first = Maybe.Some(42);
var second = Maybe.Some(43);
Assert.IsFalse(first == second);
}
[Test]
public void SomeInequalityFalseTest()
{
var first = Maybe.Some(42);
var second = Maybe.Some(42);
Assert.IsFalse(first != second);
}
[Test]
public void SomeInequalityTrueTest()
{
var first = Maybe.Some(42);
var second = Maybe.Some(43);
Assert.IsTrue(first != second);
}
}
}