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Merged
sshanks-kx merged 1 commit into from
Aug 12, 2026
Merged

increased test coverage #86

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308 changes: 308 additions & 0 deletions kx.Test/Connection/ConnectionSerialisationTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1022,6 +1022,314 @@ private T[] CreateTestArray<T>(Func<int, T> elementBuilder, int arraySize)
array[i] = elementBuilder(i);
}
return array;
}

[Test]
public void ConnectionDeserialisesBigEndianIntInput()
{
const int expected = 0x01020304;

byte[] message = CreateBigEndianMessage(
2,
unchecked((byte)-6),
0x01, 0x02, 0x03, 0x04);

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.AreEqual(expected, result);
Assert.IsFalse(connection.IsSync);
Assert.IsTrue(connection.IsResponse);
}
}

[Test]
public void ConnectionDeserialisesBigEndianLongInput()
{
const long expected = 0x0102030405060708L;

byte[] message = CreateBigEndianMessage(
1,
unchecked((byte)-7),
0x01, 0x02, 0x03, 0x04,
0x05, 0x06, 0x07, 0x08);

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.AreEqual(expected, result);
Assert.IsTrue(connection.IsSync);
Assert.IsFalse(connection.IsResponse);
}
}

[Test]
public void ConnectionDeserialisesBigEndianFloatInput()
{
const float expected = 47.25F;

byte[] value = BitConverter.GetBytes(expected);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(value);
}

byte[] payload = new byte[value.Length + 1];
payload[0] = unchecked((byte)-8);
Buffer.BlockCopy(value, 0, payload, 1, value.Length);

byte[] message = CreateBigEndianMessage(1, payload);

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.AreEqual(expected, result);
}
}

[Test]
public void ConnectionDeserialisesBigEndianIntArrayInput()
{
int[] expected =
{
0x01020304,
-2,
int.MaxValue,
int.MinValue
};

byte[] payload =
{
6, // q int list
0, // attributes
0, 0, 0, 4, // number of elements

0x01, 0x02, 0x03, 0x04,
0xff, 0xff, 0xff, 0xfe,
0x7f, 0xff, 0xff, 0xff,
0x80, 0x00, 0x00, 0x00
};

byte[] message = CreateBigEndianMessage(1, payload);

using (var connection = new c(_testVersionNumber))
{
int[] result = connection.Deserialize(message) as int[];

Assert.IsNotNull(result);
Assert.IsTrue(Enumerable.SequenceEqual(expected, result));
}
}

[Test]
public void ConnectionDeserialisesLegacyDatetimeInput()
{
DateTime expected =
new DateTime(2000, 1, 2, 12, 0, 0, DateTimeKind.Unspecified);

byte[] message = CreateLittleEndianScalar(
unchecked((byte)-15),
BitConverter.GetBytes(1.5));

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.AreEqual(expected, result);
}
}

[Test]
public void ConnectionDeserialisesLegacyDatetimePositiveInfinityAsMaxDateTime()
{
byte[] message = CreateLittleEndianScalar(
unchecked((byte)-15),
BitConverter.GetBytes(double.PositiveInfinity));

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.AreEqual(DateTime.MaxValue, result);
}
}

[Test]
public void ConnectionDeserialisesLegacyDatetimeNegativeInfinityAsMinimumKdbDateTime()
{
byte[] message = CreateLittleEndianScalar(
unchecked((byte)-15),
BitConverter.GetBytes(double.NegativeInfinity));

DateTime expected = DateTime.MinValue.AddTicks(1);

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.AreEqual(expected, result);
}
}

[Test]
public void ConnectionDeserialisesGenericNull()
{
byte[] message = CreateLittleEndianMessage(
1,
101,
0);

using (var connection = new c(_testVersionNumber))
{
object result = connection.Deserialize(message);

Assert.IsNull(result);
}
}

[Test]
public void ConnectionThrowsKExceptionForUnsupportedFunction()
{
byte[] message = CreateLittleEndianMessage(
1,
101,
1);

using (var connection = new c(_testVersionNumber))
{
KException exception =
Assert.Throws<KException>(() => connection.Deserialize(message));

Assert.AreEqual("func", exception.Message);
}
}

[Test]
public void ConnectionSetsExpectedHeaderFlagsForSyncMessage()
{
using (var connection = new c(_testVersionNumber))
{
byte[] message = connection.Serialize(1, 42);

connection.Deserialize(message);

Assert.IsTrue(connection.IsSync);
Assert.IsFalse(connection.IsResponse);
Assert.IsFalse(connection.IsCompressed);
}
}

[Test]
public void ConnectionSetsExpectedHeaderFlagsForResponseMessage()
{
using (var connection = new c(_testVersionNumber))
{
byte[] message = connection.Serialize(2, 42);

connection.Deserialize(message);

Assert.IsFalse(connection.IsSync);
Assert.IsTrue(connection.IsResponse);
Assert.IsFalse(connection.IsCompressed);
}
}

[Test]
public void ConnectionFallsBackToUncompressedWhenDataDoesNotCompressEnough()
{
byte[] expected = new byte[10000];
new Random(123456).NextBytes(expected);

using (var connection = new c(_testVersionNumber))
{
byte[] serialisedData = connection.Serialize(0, expected, true);

// Compression was requested, but effectively random data
// cannot be reduced to the compressor's target size.
Assert.AreEqual(0, serialisedData[2]);

byte[] result = connection.Deserialize(serialisedData) as byte[];

Assert.IsNotNull(result);
Assert.IsTrue(Enumerable.SequenceEqual(expected, result));
}
}

[Test]
public void ConnectionCompressesHighlyCompressibleInput()
{
byte[] expected = Enumerable.Repeat((byte)42, 10000).ToArray();

using (var connection = new c(_testVersionNumber))
{
byte[] serialisedData = connection.Serialize(0, expected, true);

Assert.AreEqual(1, serialisedData[2]);

byte[] result = connection.Deserialize(serialisedData) as byte[];

Assert.IsNotNull(result);
Assert.IsTrue(Enumerable.SequenceEqual(expected, result));
}
}

private static byte[] CreateLittleEndianScalar(
byte type,
byte[] value)
{
byte[] payload = new byte[value.Length + 1];

payload[0] = type;
Buffer.BlockCopy(value, 0, payload, 1, value.Length);

return CreateLittleEndianMessage(1, payload);
}

private static byte[] CreateLittleEndianMessage(
byte messageType,
params byte[] payload)
{
int length = 8 + payload.Length;
byte[] message = new byte[length];

message[0] = 1;
message[1] = messageType;
message[2] = 0;
message[3] = 0;

message[4] = (byte)length;
message[5] = (byte)(length >> 8);
message[6] = (byte)(length >> 16);
message[7] = (byte)(length >> 24);

Buffer.BlockCopy(payload, 0, message, 8, payload.Length);

return message;
}

private static byte[] CreateBigEndianMessage(
byte messageType,
params byte[] payload)
{
int length = 8 + payload.Length;
byte[] message = new byte[length];

message[0] = 0;
message[1] = messageType;
message[2] = 0;
message[3] = 0;

message[4] = (byte)(length >> 24);
message[5] = (byte)(length >> 16);
message[6] = (byte)(length >> 8);
message[7] = (byte)length;

Buffer.BlockCopy(payload, 0, message, 8, payload.Length);

return message;
}
}
}
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