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IdGenTests.cs
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IdGenTests.cs
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using IdGen;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections;
using System.Linq;
namespace IdGenTests
{
[TestClass]
public class IdGenTests
{
[TestMethod]
public void Sequence_ShouldIncrease_EveryInvocation()
{
// We setup our generator so that the time is 0, generator id 0 and we're only left with the sequence
// increasing each invocation of CreateId();
var ts = new MockTimeSource(0);
var m = MaskConfig.Default;
var g = new IdGenerator(0, m, ts);
Assert.AreEqual(0, g.CreateId());
Assert.AreEqual(1, g.CreateId());
Assert.AreEqual(2, g.CreateId());
}
[TestMethod]
public void Sequence_ShouldReset_EveryNewTick()
{
// We setup our generator so that the time is 0, generator id 0 and we're only left with the sequence
// increasing each invocation of CreateId();
var ts = new MockTimeSource(0);
var m = MaskConfig.Default;
var g = new IdGenerator(0, m, ts);
Assert.AreEqual(0, g.CreateId());
Assert.AreEqual(1, g.CreateId());
ts.NextTick();
// Since the timestamp has increased, we should now have a much higher value (since the timestamp is
// shifted left a number of bits (specifically GeneratorIdBits + SequenceBits)
Assert.AreEqual((1 << (m.GeneratorIdBits + m.SequenceBits)) + 0, g.CreateId());
Assert.AreEqual((1 << (m.GeneratorIdBits + m.SequenceBits)) + 1, g.CreateId());
}
[TestMethod]
public void GeneratorId_ShouldBePresent_InID1()
{
// We setup our generator so that the time is 0 and generator id equals 1023 so that all 10 bits are set
// for the generator.
var ts = new MockTimeSource();
var m = MaskConfig.Default; // We use a default mask-config with 11 bits for the generator this time
var g = new IdGenerator(1023, m, ts);
// Make sure all expected bits are set
Assert.AreEqual((1 << m.GeneratorIdBits) - 1 << m.SequenceBits, g.CreateId());
}
[TestMethod]
public void GeneratorId_ShouldBePresent_InID2()
{
// We setup our generator so that the time is 0 and generator id equals 4095 so that all 12 bits are set
// for the generator.
var ts = new MockTimeSource();
var m = new MaskConfig(40, 12, 11); // We use a custom mask-config with 12 bits for the generator this time
var g = new IdGenerator(4095, m, ts);
// Make sure all expected bits are set
Assert.AreEqual(-1 & ((1 << 12) - 1), g.Id);
Assert.AreEqual((1 << 12) - 1 << 11, g.CreateId());
}
[TestMethod]
public void GeneratorId_ShouldBeMasked_WhenReadFromProperty()
{
// We setup our generator so that the time is 0 and generator id equals 1023 so that all 10 bits are set
// for the generator.
var ts = new MockTimeSource();
var m = MaskConfig.Default;
var g = new IdGenerator(1023, m, ts);
// Make sure all expected bits are set
Assert.AreEqual((1 << m.GeneratorIdBits) - 1, g.Id);
}
[TestMethod]
[ExpectedException(typeof(ArgumentNullException))]
public void Constructor_Throws_OnNullMaskConfig()
{
new IdGenerator(0, (MaskConfig)null);
}
[TestMethod]
[ExpectedException(typeof(ArgumentNullException))]
public void Constructor_Throws_OnNullTimeSource()
{
new IdGenerator(0, (ITimeSource)null);
}
[TestMethod]
[ExpectedException(typeof(InvalidOperationException))]
public void Constructor_Throws_OnMaskConfigNotExactly63Bits()
{
new IdGenerator(0, new MaskConfig(41, 10, 11));
}
[TestMethod]
[ExpectedException(typeof(ArgumentOutOfRangeException))]
public void Constructor_Throws_OnGeneratorIdMoreThan31Bits()
{
new IdGenerator(0, new MaskConfig(21, 32, 10));
}
[TestMethod]
[ExpectedException(typeof(ArgumentOutOfRangeException))]
public void Constructor_Throws_OnSequenceMoreThan31Bits()
{
new IdGenerator(0, new MaskConfig(21, 10, 32));
}
[TestMethod]
[ExpectedException(typeof(SequenceOverflowException))]
public void CreateId_Throws_OnSequenceOverflow()
{
var ts = new MockTimeSource();
var g = new IdGenerator(0, new MaskConfig(41, 20, 2), ts);
// We have a 2-bit sequence; generating 4 id's shouldn't be a problem
for (int i = 0; i < 4; i++)
Assert.AreEqual(i, g.CreateId());
// However, if we invoke once more we should get an SequenceOverflowException
g.CreateId();
}
[TestMethod]
public void CreateId_Waits_OnSequenceOverflow()
{
var ts = new MockTimeSource(){AutoincrementAfterCallsNum = 20};
var g = new IdGenerator(0, new MaskConfig(61, 0, 2), ts)
{
SpinOnTimeSlotExhausted = true
};
// We have a 2-bit sequence; generating 4 id's in a single time slot - wait for other then
for (int i = 0; i < 20; i++)
Assert.AreEqual(i, g.CreateId());
}
[TestMethod]
public void TryCreateId_Returns_False_OnSequenceOverflow()
{
var ts = new MockTimeSource();
var g = new IdGenerator(0, new MaskConfig(41, 20, 2), ts);
// We have a 2-bit sequence; generating 4 id's shouldn't be a problem
for (int i = 0; i < 4; i++)
Assert.IsTrue(g.TryCreateId(out var _));
// However, if we invoke once more we should get an SequenceOverflowException
// which should be indicated by the false return value
Assert.IsFalse(g.TryCreateId(out var _));
}
[TestMethod]
public void Constructor_UsesCorrect_Values()
{
Assert.AreEqual(123, new IdGenerator(123).Id); // Make sure the test-value is not masked so it matches the expected value!
Assert.AreEqual(IdGenerator.DefaultEpoch, new IdGenerator(0).Epoch);
}
[TestMethod]
public void Enumerable_ShoudReturn_Ids()
{
var g = new IdGenerator(0);
var ids = g.Take(1000).ToArray();
Assert.AreEqual(1000, ids.Distinct().Count());
}
[TestMethod]
public void Enumerable_ShoudReturn_Ids_InterfaceExplicit()
{
var g = (IEnumerable)new IdGenerator(0);
var ids = g.OfType<long>().Take(1000).ToArray();
Assert.AreEqual(1000, ids.Distinct().Count());
}
[TestMethod]
[ExpectedException(typeof(InvalidSystemClockException))]
public void CreateId_Throws_OnClockBackwards()
{
var ts = new MockTimeSource(100);
var m = MaskConfig.Default;
var g = new IdGenerator(0, m, ts);
g.CreateId();
ts.PreviousTick(); // Set clock back 1 'tick', this results in the time going from "100" to "99"
g.CreateId();
}
[TestMethod]
public void TryCreateId_Returns_False_OnClockBackwards()
{
var ts = new MockTimeSource(100);
var m = MaskConfig.Default;
var g = new IdGenerator(0, m, ts);
Assert.IsTrue(g.TryCreateId(out var _));
ts.PreviousTick(); // Set clock back 1 'tick', this results in the time going from "100" to "99"
Assert.IsFalse(g.TryCreateId(out var _));
}
[TestMethod]
[ExpectedException(typeof(ArgumentOutOfRangeException))]
public void Constructor_Throws_OnInvalidGeneratorId_Positive()
{
new IdGenerator(1024);
}
[TestMethod]
[ExpectedException(typeof(ArgumentOutOfRangeException))]
public void Constructor_Throws_OnInvalidGeneratorId_Negative()
{
new IdGenerator(-1);
}
[TestMethod]
[ExpectedException(typeof(InvalidSystemClockException))]
public void CreateId_Throws_OnTimestampWraparound()
{
var m = MaskConfig.Default;
var ts = new MockTimeSource(long.MaxValue); // Set clock to 1 'tick' before wraparound
var g = new IdGenerator(0, m, ts);
Assert.IsTrue(g.CreateId() > 0); // Should succeed;
ts.NextTick();
g.CreateId(); // Should fail
}
[TestMethod]
public void TryCreateId_Returns_False_OnTimestampWraparound()
{
var m = MaskConfig.Default;
var ts = new MockTimeSource(long.MaxValue); // Set clock to 1 'tick' before wraparound
var g = new IdGenerator(0, m, ts);
Assert.IsTrue(g.TryCreateId(out var _)); // Should succeed;
ts.NextTick();
Assert.IsFalse(g.TryCreateId(out var _)); // Should fail
}
[TestMethod]
public void MaskConfigProperty_Returns_CorrectValue()
{
var md = MaskConfig.Default;
var mc = new MaskConfig(21, 21, 21);
Assert.IsTrue(ReferenceEquals(md, new IdGenerator(0, md).MaskConfig));
Assert.IsTrue(ReferenceEquals(mc, new IdGenerator(0, mc).MaskConfig));
}
[TestMethod]
public void Constructor_Overloads()
{
var i = 99;
var ts = new MockTimeSource();
var m = MaskConfig.Default;
var epoch = DateTimeOffset.UtcNow;
// Check all constructor overload variations
Assert.AreEqual(i, new IdGenerator(i).Id);
Assert.AreEqual(IdGenerator.DefaultEpoch, new IdGenerator(i).Epoch);
Assert.AreEqual(i, new IdGenerator(i, epoch).Id);
Assert.AreEqual(epoch, new IdGenerator(i, epoch).Epoch);
Assert.AreEqual(i, new IdGenerator(i, ts).Id);
Assert.AreSame(ts, new IdGenerator(i, ts).TimeSource);
Assert.AreEqual(DateTimeOffset.MinValue, new IdGenerator(i, ts).Epoch);
Assert.AreEqual(i, new IdGenerator(i, m).Id);
Assert.AreSame(m, new IdGenerator(i, m).MaskConfig);
Assert.AreEqual(IdGenerator.DefaultEpoch, new IdGenerator(i, m).Epoch);
Assert.AreEqual(i, new IdGenerator(i, epoch, m).Id);
Assert.AreSame(m, new IdGenerator(i, epoch, m).MaskConfig);
Assert.AreEqual(epoch, new IdGenerator(i, epoch, m).Epoch);
Assert.AreEqual(i, new IdGenerator(i, m, ts).Id);
Assert.AreSame(ts, new IdGenerator(i, m, ts).TimeSource);
Assert.AreSame(m, new IdGenerator(i, m, ts).MaskConfig);
Assert.AreEqual(DateTimeOffset.MinValue, new IdGenerator(i, m, ts).Epoch);
}
[TestMethod]
public void FromId_Returns_CorrectValue()
{
var mc = new MaskConfig(42, 8, 13);
var epoch = new DateTimeOffset(2018, 7, 31, 14, 48, 2, TimeSpan.FromHours(2)); // Just some "random" epoch...
var ts = new MockTimeSource(5, TimeSpan.FromSeconds(7), epoch); // Set clock at 5 ticks; each tick being 7 seconds...
var idgen = new IdGenerator(234, mc, ts); // Set generator id to 234
// Generate a bunch of id's
long id = 0;
for (int i = 0; i < 35; i++)
id = idgen.CreateId();
var target = idgen.FromId(id);
Assert.AreEqual(34, target.SequenceNumber); // We generated 35 id's in the same tick, so sequence should be at 34.
Assert.AreEqual(234, target.GeneratorId); // With generator id 234
Assert.AreEqual(epoch.Add(TimeSpan.FromSeconds(5 * 7)), target.DateTimeOffset); // And the clock was at 5 ticks, with each tick being
// 7 seconds (so 35 seconds from epoch)
// And epoch was 2018-7-31 14:48:02 +02:00...
}
}
}