/// <summary>
/// Applies Capacity+1 times the same test to the same buffer "logical" content but with
/// different internal offsets each time.
/// The "logical" initial buffer content is restored each time and at the end of the test.
/// </summary>
static void TestWithInternalOffsets <T>(FIFOBuffer <T> f, Action <FIFOBuffer <T> > testPredicate)
{
var saved = f.ToArray();
for (int iTry = 0; iTry <= f.Capacity; ++iTry)
{
f.Clear();
for (int i = 0; i < iTry; ++i)
{
f.Push(default(T));
}
foreach (var i in saved)
{
f.Push(i);
}
while (f.Count > saved.Length)
{
f.Pop();
}
f.SequenceEqual(saved).Should().BeTrue();
testPredicate(f);
}
foreach (var i in saved)
{
f.Push(i);
}
f.Truncate(saved.Length);
}
public void FIFO_ToArray_method()
{
int[] initialArray = new int[7];
initialArray[0] = initialArray[6] = -1;
FIFOBuffer <int> f = new FIFOBuffer <int>(5);
f.ToArray().Length.Should().Be(0);
f.Invoking(sut => sut.CopyTo(null)).Should().Throw <ArgumentNullException>();
f.Invoking(sut => sut.CopyTo(null, 0)).Should().Throw <ArgumentNullException>();
f.Invoking(sut => sut.CopyTo(null, 0, 0)).Should().Throw <ArgumentNullException>();
TestWithInternalOffsets(f, b =>
{
var array = (int[])initialArray.Clone();
b.Push(1);
b.CopyTo(array, 3, 2);
array.SequenceEqual(new int[] { -1, 0, 0, 1, 0, 0, -1 }).Should().BeTrue();
array[3] = 0;
b.Push(2);
b.CopyTo(array, 3, 2);
array.SequenceEqual(new int[] { -1, 0, 0, 1, 2, 0, -1 }).Should().BeTrue();
array[3] = 0; array[4] = 0;
b.Push(3);
b.CopyTo(array, 3, 3);
array.SequenceEqual(new int[] { -1, 0, 0, 1, 2, 3, -1 }).Should().BeTrue();
array[3] = 0; array[4] = 0; array[5] = 0;
b.Push(4);
b.CopyTo(array, 3, 3);
array.SequenceEqual(new int[] { -1, 0, 0, 2, 3, 4, -1 }).Should().BeTrue();
array[3] = 0; array[4] = 0; array[5] = 0;
b.CopyTo(array, 2, 4);
array.SequenceEqual(new int[] { -1, 0, 1, 2, 3, 4, -1 }).Should().BeTrue();
array[3] = 0; array[4] = 0; array[5] = 0;
b.CopyTo(array, 2, 5).Should().Be(4);
array.SequenceEqual(new int[] { -1, 0, 1, 2, 3, 4, -1 }).Should().BeTrue("Sentinel is not changed: there is only 4 items to copy.");
b.Invoking(sut => sut.CopyTo(array, 2, 6)).Should().Throw <IndexOutOfRangeException>("Even if the items fit, there must be an exception.");
b.Truncate(1);
b.Peek().Should().Be(4);
b.Push(60);
b.Push(61);
b.Push(62);
b.Push(63);
b.Push(7); // oldest
b.Push(8);
b.Push(9);
b.Push(10);
b.Push(11);
b[0].Should().Be(7);
array[3] = 0; array[4] = 0; array[5] = 0;
b.CopyTo(array, 1).Should().Be(5);
array.SequenceEqual(new int[] { -1, 7, 8, 9, 10, 11, -1 }).Should().BeTrue("Sentinel is not changed: there is only 5 items to copy.");
array[5] = 0;
b.CopyTo(array, 0).Should().Be(5);
array.SequenceEqual(new int[] { 7, 8, 9, 10, 11, 0, -1 }).Should().BeTrue();
b.CopyTo(array, 5).Should().Be(2);
array.SequenceEqual(new int[] { 7, 8, 9, 10, 11, 10, 11 }).Should().BeTrue();
});
}
static void AssertContains <T>(FIFOBuffer <T> f, params T[] values)
{
f.Count.Should().Be(values.Length);
f.SequenceEqual(values).Should().BeTrue();
f.ToArray().SequenceEqual(values).Should().BeTrue();
}
static void AssertContains <T>(FIFOBuffer <T> f, params T[] values)
{
Assert.That(f.Count, Is.EqualTo(values.Length));
CollectionAssert.AreEqual(f, values);
CollectionAssert.AreEqual(f.ToArray(), values);
}
public void FIFO_ToArray_method()
{
int[] initialArray = new int[7];
initialArray[0] = initialArray[6] = -1;
FIFOBuffer <int> f = new FIFOBuffer <int>(5);
CollectionAssert.AreEqual(f.ToArray(), new int[0]);
Assert.Throws <ArgumentNullException>(() => f.CopyTo(null));
Assert.Throws <ArgumentNullException>(() => f.CopyTo(null, 0));
Assert.Throws <ArgumentNullException>(() => f.CopyTo(null, 0, 0));
TestWithInternalOffsets(f, b =>
{
var array = (int[])initialArray.Clone();
b.Push(1);
b.CopyTo(array, 3, 2);
CollectionAssert.AreEqual(array, new int[] { -1, 0, 0, 1, 0, 0, -1 });
array[3] = 0;
b.Push(2);
b.CopyTo(array, 3, 2);
CollectionAssert.AreEqual(array, new int[] { -1, 0, 0, 1, 2, 0, -1 });
array[3] = 0; array[4] = 0;
b.Push(3);
b.CopyTo(array, 3, 3);
CollectionAssert.AreEqual(array, new int[] { -1, 0, 0, 1, 2, 3, -1 });
array[3] = 0; array[4] = 0; array[5] = 0;
b.Push(4);
b.CopyTo(array, 3, 3);
CollectionAssert.AreEqual(array, new int[] { -1, 0, 0, 2, 3, 4, -1 });
array[3] = 0; array[4] = 0; array[5] = 0;
b.CopyTo(array, 2, 4);
CollectionAssert.AreEqual(array, new int[] { -1, 0, 1, 2, 3, 4, -1 });
array[3] = 0; array[4] = 0; array[5] = 0;
Assert.That(b.CopyTo(array, 2, 5), Is.EqualTo(4));
CollectionAssert.AreEqual(array, new int[] { -1, 0, 1, 2, 3, 4, -1 }, "Sentinel is not changed: there is only 4 items to copy.");
Assert.Throws <IndexOutOfRangeException>(() => b.CopyTo(array, 2, 6), "Even if the items fit, there must be an exception.");
b.Truncate(1);
Assert.That(b.Peek(), Is.EqualTo(4));
b.Push(60);
b.Push(61);
b.Push(62);
b.Push(63);
b.Push(7); // oldest
b.Push(8);
b.Push(9);
b.Push(10);
b.Push(11);
Assert.That(b[0], Is.EqualTo(7));
array[3] = 0; array[4] = 0; array[5] = 0;
Assert.That(b.CopyTo(array, 1), Is.EqualTo(5));
CollectionAssert.AreEqual(array, new int[] { -1, 7, 8, 9, 10, 11, -1 }, "Sentinel is not changed: there is only 5 items to copy.");
array[5] = 0;
Assert.That(b.CopyTo(array, 0), Is.EqualTo(5));
CollectionAssert.AreEqual(array, new int[] { 7, 8, 9, 10, 11, 0, -1 });
Assert.That(b.CopyTo(array, 5), Is.EqualTo(2));
CollectionAssert.AreEqual(array, new int[] { 7, 8, 9, 10, 11, 10, 11 });
});
}
private static void AssertContains <T>(FIFOBuffer <T> f, params T[] values)
{
Assert.That(f.Count, Is.EqualTo(values.Length));
Assert.That(f.SequenceEqual(values), Is.True);
Assert.That(f.ToArray().SequenceEqual(values), Is.True);
}