public void GetHashCode_SameHashCodeIsReturnedEveryTimeTheMethodIsCalled_AsLongAsTheObjectDoesNotChange()
{
// Arrange
var deviceName = "C:";
var freeDiscSpaceInPercent = 30.0d;
var object1 = new SystemStorageDeviceInformation {
DeviceName = deviceName, FreeDiscSpaceInPercent = freeDiscSpaceInPercent
};
int expectedHashcode = object1.GetHashCode();
for (var i = 0; i < 100; i++)
{
// Act
object1.DeviceName = deviceName;
object1.FreeDiscSpaceInPercent = freeDiscSpaceInPercent;
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.AreEqual(expectedHashcode, generatedHashCode);
}
}
public void GetHashCode_TwoIdenticalObjects_BothUninitialized_HashCodesAreEqual()
{
// Arrange
var package1 = new SystemStorageDeviceInformation();
var package2 = new SystemStorageDeviceInformation();
// Act
int hashCodeObject1 = package1.GetHashCode();
int hashCodeObject2 = package2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_TwoDistinctObjects_HashCodesAreDifferent()
{
// Arrange
var object1 = new SystemStorageDeviceInformation {
DeviceName = "C:", FreeDiscSpaceInPercent = 30.0d
};
var object2 = new SystemStorageDeviceInformation {
DeviceName = "E:", FreeDiscSpaceInPercent = 10.0d
};
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreNotEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_TwoIdenticalObjects_BothInitialized_HashCodesAreEqual()
{
// Arrange
var object1 = new SystemStorageDeviceInformation {
DeviceName = "C:", FreeDiscSpaceInPercent = 30.0d
};
var object2 = new SystemStorageDeviceInformation {
DeviceName = "C:", FreeDiscSpaceInPercent = 30.0d
};
// Act
int hashCodeObject1 = object1.GetHashCode();
int hashCodeObject2 = object2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_ForAllUniqueObject_AUniqueHashCodeIsReturned()
{
var hashCodes = new Dictionary <int, SystemStorageDeviceInformation>();
for (var i = 0; i < 1000; i++)
{
// Act
var object1 = new SystemStorageDeviceInformation {
DeviceName = i.ToString(), FreeDiscSpaceInPercent = i
};
int generatedHashCode = object1.GetHashCode();
// Assert
Assert.IsFalse(hashCodes.ContainsKey(generatedHashCode));
hashCodes.Add(generatedHashCode, object1);
}
}