public void AtOrDefault_FromIndexedExtensions_ReturnsCorrectValues(int index, int length)
{
var source = Enumerable.Range(0, length).ToArray();
var sut = IndexedExtensions.AtOrDefault(source, index);
if (index < 0)
{
index = length + index;
}
Assert.Equal(index, sut);
}
public void Slice_FromIndexedExtensions_ReturnsCorrectValues()
{
this.RunSliceTestCases((from, to, step, length) =>
{
var source = Enumerable.Range(0, length).ToArray();
var sut = IndexedExtensions.Slice(source, from, to, step).ToArray();
var expected = SliceExpectedResultCalculator.Calculate(from, to, step, length);
Assert.True(
expected.SequenceEqual(sut),
ErrorFormatter.Format(sliceResultErrorFormat, source, from, to, step, expected, sut));
});
}
public void Slice_FromIndexedExtensions_GivenNullSource_ThrowsArgumentNullException()
{
Assert.Throws <ArgumentNullException>(() => IndexedExtensions.Slice <int>(null));
}
public void Slice_FromIndexedExtensions_GivenStepZero_ThrowsArgumentException()
{
Assert.Throws <ArgumentException>(() => IndexedExtensions.Slice(Enumerable.Empty <int>().ToArray(), step: 0));
}
public void AtOrDefault_FromIndexedExtensions_GivenIndexOurOfRange_ReturnsNull_WhenExecutedOnReferenceCollection(int index, int collectionLength)
{
var source = Enumerable.Range(0, collectionLength).Select(x => x.ToString()).ToArray();
Assert.Equal(null, IndexedExtensions.AtOrDefault(source, index));
}
public void AtOrDefault_FromIndexedExtensions_GivenIndexOurOfRange_ReturnsDefaultValue_WhenExecutedOnValueCollection(int index, int length)
{
var source = Enumerable.Range(0, length).ToArray();
Assert.Equal(default(int), IndexedExtensions.AtOrDefault(source, index));
}
public void AtOrDefault_FromIndexedExtensions_GivenNullSource_ThrowsArgumentNullException()
{
Assert.Throws <ArgumentNullException>(() => IndexedExtensions.AtOrDefault <int>(null, 0));
}
public void At_FromIndexedExtensions_GivenIndexOurOfRange_ThrowsIndexOurOfRangeException(int index, int length)
{
var source = Enumerable.Range(0, length).ToArray();
Assert.Throws <IndexOutOfRangeException>(() => IndexedExtensions.At(source, index));
}