public void GetHashCode_TwoIdenticalObjects_BothUninitialized_HashCodesAreEqual()
{
// Arrange
var package1 = new SystemPerformanceData();
var package2 = new SystemPerformanceData();
// Act
int hashCodeObject1 = package1.GetHashCode();
int hashCodeObject2 = package2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_TwoIdenticalObjects_BothInitialized_HashCodesAreEqual()
{
// Arrange
var object1 = new SystemPerformanceData
{
MemoryStatus = new SystemMemoryInformation { AvailableMemoryInGB = 3 },
ProcessorStatus = new ProcessorUtilizationInformation { ProcessorUtilizationInPercent = 30d }
};
var object2 = new SystemPerformanceData
{
MemoryStatus = new SystemMemoryInformation { AvailableMemoryInGB = 3 },
ProcessorStatus = new ProcessorUtilizationInformation { ProcessorUtilizationInPercent = 30d }
};
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_SameHashCodeIsReturnedEveryTimeTheMethodIsCalled_AsLongAsTheObjectDoesNotChange()
{
// Arrange
var memoryStatus = new SystemMemoryInformation { AvailableMemoryInGB = 3 };
var processorStatus = new ProcessorUtilizationInformation { ProcessorUtilizationInPercent = 30d };
var storageStatus = new SystemStorageInformation();
var object1 = new SystemPerformanceData { MemoryStatus = memoryStatus, ProcessorStatus = processorStatus, StorageStatus = storageStatus };
int expectedHashcode = object1.GetHashCode();
for (var i = 0; i < 100; i++)
{
// Act
object1.MemoryStatus = memoryStatus;
object1.ProcessorStatus = processorStatus;
object1.StorageStatus = storageStatus;
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.AreEqual(expectedHashcode, generatedHashCode);
}
}
public void GetHashCode_TwoDistinctObjects_HashCodesAreDifferent()
{
// Arrange
var object1 = new SystemPerformanceData
{
MemoryStatus = new SystemMemoryInformation { AvailableMemoryInGB = 3 },
ProcessorStatus = new ProcessorUtilizationInformation { ProcessorUtilizationInPercent = 30d }
};
var object2 = new SystemPerformanceData
{
MemoryStatus = new SystemMemoryInformation { AvailableMemoryInGB = 4 },
ProcessorStatus = new ProcessorUtilizationInformation { ProcessorUtilizationInPercent = 90d }
};
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreNotEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_ForAllUniqueObject_AUniqueHashCodeIsReturned()
{
var hashCodes = new Dictionary<int, SystemPerformanceData>();
for (var i = 0; i < 10000; i++)
{
// Act
var object1 = new SystemPerformanceData
{
MemoryStatus = new SystemMemoryInformation { AvailableMemoryInGB = i },
ProcessorStatus = new ProcessorUtilizationInformation { ProcessorUtilizationInPercent = 30d }
};
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.IsFalse(hashCodes.ContainsKey(generatedHashCode));
hashCodes.Add(generatedHashCode, object1);
}
}
