public void AddOffset_InitializeTheValue_DoNothing()
{
// Arrange
var offsets = new PartitionOffsets();
// Act
offsets.AddOffset(1);
// Assert
offsets.LastOffset.Should().Be(-1);
}
public void ShouldUpdateOffset_WithOneGap_ShouldNotUpdate()
{
// Arrange
var offsets = new PartitionOffsets();
offsets.AddOffset(1);
// Act
var shouldUpdate = offsets.ShouldUpdateOffset(2);
// Assert
Assert.IsFalse(shouldUpdate);
Assert.AreEqual(-1, offsets.LastOffset);
}
public void ShouldUpdateOffset_NextOffset_ShouldUpdate()
{
// Arrange
var offsets = new PartitionOffsets();
offsets.AddOffset(1);
// Act
var shouldUpdate = offsets.ShouldUpdateOffset(1);
// Assert
Assert.IsTrue(shouldUpdate);
Assert.AreEqual(1, offsets.LastOffset);
}
public void ShouldUpdateOffset_WithManyConcurrentOffsets_ShouldUpdate()
{
// Arrange
const int count = 1000000;
var target = new PartitionOffsets();
var offsets = new List <int>(count);
for (var i = 0; i < count; i += 2)
{
target.AddOffset(i);
offsets.Add(i);
}
// Act
Parallel.ForEach(offsets, offset => target.ShouldUpdateOffset(offset));
// Assert
Assert.AreEqual(999998, target.LastOffset);
}
public void ShouldUpdateOffset_WithManyGaps_ShouldUpdate()
{
// Arrange
var offsets = new PartitionOffsets();
offsets.AddOffset(1);
offsets.AddOffset(2);
offsets.AddOffset(4);
offsets.AddOffset(5);
offsets.AddOffset(7);
offsets.AddOffset(8);
offsets.AddOffset(15);
offsets.AddOffset(20);
offsets.AddOffset(50);
// Act
var results = new[]
{
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(7),
ShouldUpdateExpected = false,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = -1,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(1),
ShouldUpdateExpected = true,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 1,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(2),
ShouldUpdateExpected = true,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 2,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(20),
ShouldUpdateExpected = false,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 2,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(5),
ShouldUpdateExpected = false,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 2,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(8),
ShouldUpdateExpected = false,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 2,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(4),
ShouldUpdateExpected = true,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 8,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(15),
ShouldUpdateExpected = true,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 20,
},
new
{
ShouldUpdateResult = offsets.ShouldUpdateOffset(50),
ShouldUpdateExpected = true,
LastOffsetResult = offsets.LastOffset,
LastOffsetExpected = 50,
},
};
// Assert
foreach (var result in results)
{
Assert.AreEqual(result.ShouldUpdateExpected, result.ShouldUpdateResult);
Assert.AreEqual(result.LastOffsetExpected, result.LastOffsetResult);
}
}