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 });
});
}
public void FIFO_change_capacity_preserves_items()
{
FIFOBuffer <int> f = new FIFOBuffer <int>(0);
Assert.That(f.Capacity, Is.EqualTo(0));
AssertEmpty(f);
f.Push(5);
AssertEmpty(f);
f.Push(12);
AssertEmpty(f);
f.Capacity = 1;
Assert.That(f.Capacity, Is.EqualTo(1));
AssertEmpty(f);
f.Push(5);
AssertContains(f, 5);
f.Push(6);
AssertContains(f, 6);
f.Capacity = 2;
Assert.That(f.Capacity, Is.EqualTo(2));
AssertContains(f, 6);
f.Push(7);
AssertContains(f, 6, 7);
f.Push(8);
AssertContains(f, 7, 8);
f.Capacity = 4;
Assert.That(f.Capacity, Is.EqualTo(4));
AssertContains(f, 7, 8);
f.Push(9);
AssertContains(f, 7, 8, 9);
f.Push(10);
AssertContains(f, 7, 8, 9, 10);
f.Push(11);
AssertContains(f, 8, 9, 10, 11);
f.Capacity = 7;
Assert.That(f.Capacity, Is.EqualTo(7));
AssertContains(f, 8, 9, 10, 11);
f.Push(12);
AssertContains(f, 8, 9, 10, 11, 12);
f.Push(13);
AssertContains(f, 8, 9, 10, 11, 12, 13);
f.Push(14);
AssertContains(f, 8, 9, 10, 11, 12, 13, 14);
f.Push(15);
AssertContains(f, 9, 10, 11, 12, 13, 14, 15);
f.Capacity = 2;
Assert.That(f.Capacity, Is.EqualTo(2));
AssertContains(f, 14, 15);
f.Capacity = 3;
Assert.That(f.Capacity, Is.EqualTo(3));
AssertContains(f, 14, 15);
f.Push(16);
AssertContains(f, 14, 15, 16);
f.Capacity = 2;
Assert.That(f.Capacity, Is.EqualTo(2));
AssertContains(f, 15, 16);
f.Capacity = 1;
Assert.That(f.Capacity, Is.EqualTo(1));
AssertContains(f, 16);
f.Capacity = 0;
Assert.That(f.Capacity, Is.EqualTo(0));
AssertEmpty(f);
f.Capacity = 2;
f.Capacity = 2;
Assert.That(f.Capacity, Is.EqualTo(2));
Assert.That(f.ToString(), Is.EqualTo(String.Format("Count = {0} (Capacity = {1})", 0, 2)));
//ExceptionTest
Assert.Throws <ArgumentException>(() => f.Capacity = -1);
Assert.Throws <ArgumentException>(() => new FIFOBuffer <int>(-1));
Assert.Throws <IndexOutOfRangeException>(() => f.CopyTo(new int[2], 0, -1));
}