public void GetHashCode_TwoIdenticalObjects_BothUninitialized_HashCodesAreEqual()
{
// Arrange
var package1 = new SystemMemoryInformation();
var package2 = new SystemMemoryInformation();
// Act
int hashCodeObject1 = package1.GetHashCode();
int hashCodeObject2 = package2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_TwoIdenticalObjects_BothInitialized_HashCodesAreEqual()
{
// Arrange
var object1 = new SystemMemoryInformation { AvailableMemoryInGB = 8.0d, UsedMemoryInGB = 3.0d };
var object2 = new SystemMemoryInformation { AvailableMemoryInGB = 8.0d, UsedMemoryInGB = 3.0d };
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_SameHashCodeIsReturnedEveryTimeTheMethodIsCalled_AsLongAsTheObjectDoesNotChange()
{
// Arrange
var availableMemoryInGB = 8.0d;
var usedMemoryInGB = 3.0d;
var object1 = new SystemMemoryInformation { AvailableMemoryInGB = availableMemoryInGB, UsedMemoryInGB = usedMemoryInGB };
int expectedHashcode = object1.GetHashCode();
for (var i = 0; i < 100; i++)
{
// Act
object1.AvailableMemoryInGB = availableMemoryInGB;
object1.UsedMemoryInGB = usedMemoryInGB;
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.AreEqual(expectedHashcode, generatedHashCode);
}
}
public void GetHashCode_TwoDistinctObjects_HashCodesAreDifferent()
{
// Arrange
var object1 = new SystemMemoryInformation { AvailableMemoryInGB = 8.0d, UsedMemoryInGB = 3.0d };
var object2 = new SystemMemoryInformation { AvailableMemoryInGB = 16.0d, UsedMemoryInGB = 7.0d };
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreNotEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_ForAllUniqueObject_AUniqueHashCodeIsReturned()
{
var hashCodes = new Dictionary<int, SystemMemoryInformation>();
for (var i = 0; i < 1000; i++)
{
// Act
var object1 = new SystemMemoryInformation { AvailableMemoryInGB = i, UsedMemoryInGB = i / 2.0d };
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.IsFalse(hashCodes.ContainsKey(generatedHashCode));
hashCodes.Add(generatedHashCode, object1);
}
}
