public void GetHashCode_TwoIdenticalObjects_BothUninitialized_HashCodesAreEqual()
{
// Arrange
var package1 = new PackageInfo();
var package2 = new PackageInfo();
// Act
int hashCodeObject1 = package1.GetHashCode();
int hashCodeObject2 = package2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_SameHashCodeIsReturnedEveryTimeTheMethodIsCalled_AsLongAsTheObjectDoesNotChange()
{
// Arrange
var packageId = "Package";
var packageVersion = "1.0.0";
var package = new PackageInfo { Id = packageId, Version = packageVersion };
int expectedHashcode = package.GetHashCode();
for (var i = 0; i < 100; i++)
{
// Act
package.Id = packageId;
package.Version = packageVersion;
int generatedHashCode = package.GetHashCode();
// Assert
Assert.AreEqual(expectedHashcode, generatedHashCode);
}
}
public void GetHashCode_TwoIdenticalObjects_BothInitialized_HashCodesAreEqual()
{
// Arrange
var package1 = new PackageInfo { Id = "Package1", Version = "1.0.0" };
var package2 = new PackageInfo { Id = "Package1", Version = "1.0.0" };
// Act
int hashCodeObject1 = package1.GetHashCode();
int hashCodeObject2 = package2.GetHashCode();
// Assert
Assert.AreEqual(hashCodeObject1, hashCodeObject2);
}
public void GetHashCode_ForAllUniqueObject_AUniqueHashCodeIsReturned()
{
var hashCodes = new Dictionary<int, PackageInfo>();
for (var i = 0; i < 10000; i++)
{
// Act
var packageInfo = new PackageInfo { Id = Guid.NewGuid().ToString(), Version = Guid.NewGuid().ToString() };
int generatedHashCode = packageInfo.GetHashCode();
// Assert
Assert.IsFalse(hashCodes.ContainsKey(generatedHashCode));
hashCodes.Add(generatedHashCode, packageInfo);
}
}