public void GetHashCode_ForAllUniqueObject_AUniqueHashCodeIsReturned()
{
var hashCodes = new Dictionary<int, SystemStorageInformation>();
for (var i = 0; i < 10000; i++)
{
// Act
var object1 = new SystemStorageInformation { StorageDeviceInfos = new[] { new SystemStorageDeviceInformation { DeviceName = "C:", FreeDiscSpaceInPercent = i } } };
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.IsFalse(hashCodes.ContainsKey(generatedHashCode));
hashCodes.Add(generatedHashCode, object1);
}
}
public void GetHashCode_TwoIdenticalObjects_BothUninitialized_HashCodesAreEqual()
{
// Arrange
var package1 = new SystemStorageInformation();
var package2 = new SystemStorageInformation();
// Act
int hashCodeObject1 = package1.GetHashCode();
int hashCodeObject2 = package2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_TwoDistinctObjects_HashCodesAreDifferent()
{
// Arrange
var object1 = new SystemStorageInformation { StorageDeviceInfos = new[] { new SystemStorageDeviceInformation { DeviceName = "C:", FreeDiscSpaceInPercent = 50.0d } } };
var object2 = new SystemStorageInformation { StorageDeviceInfos = new[] { new SystemStorageDeviceInformation { DeviceName = "D:", FreeDiscSpaceInPercent = 50.0d } } };
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreNotEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_TwoIdenticalObjects_BothInitialized_HashCodesAreEqual()
{
// Arrange
var object1 = new SystemStorageInformation { StorageDeviceInfos = new[] { new SystemStorageDeviceInformation { DeviceName = "C:", FreeDiscSpaceInPercent = 50.0d } } };
var object2 = new SystemStorageInformation { StorageDeviceInfos = new[] { new SystemStorageDeviceInformation { DeviceName = "C:", FreeDiscSpaceInPercent = 50.0d } } };
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_SameHashCodeIsReturnedEveryTimeTheMethodIsCalled_AsLongAsTheObjectDoesNotChange()
{
// Arrange
var device1 = new SystemStorageDeviceInformation { DeviceName = "C:", FreeDiscSpaceInPercent = 50.0d };
var object1 = new SystemStorageInformation { StorageDeviceInfos = new[] { device1 } };
int expectedHashcode = object1.GetHashCode();
for (var i = 0; i < 100; i++)
{
// Act
object1.StorageDeviceInfos = new[] { device1 };
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.AreEqual(expectedHashcode, generatedHashCode);
}
}
