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Level 3®
Implementing
Unit Testing Frameworks for .NET
Prepared By: Mohamed El-Deeb
Date: 24-06-2007

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SetUp

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How
//TearDown
account.Balance = 0;
[SetUp]
public void Init()
{
//SetUp
account = new Account();
account.Deposit(150);
//Excercise
account.Withdraw(50);
//Verify
Assert.AreEqual(account.Balance, 100);
}
[TearDown]
public void Dispose()
{
}
}
[Test]
public void TestWithdraw()
{
[TestFixture]
public class AccountTest
{
Account account;
}

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How
[TestFixture]
public class AccountTest
{
[Test]
public void TestWithdraw()
{
//SetUp
Account source = new Account();
source.Deposit(200);
Account destination = new Account();
destination.Deposit(150);
//Excercise
source.TransferFunds(destination, 100);
//Verify
Assert.AreEqual(source.Balance, 100);
Assert.AreEqual(destination.Balance, 250);
}
}

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Test Doubles

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State verification
[TestFixture]
public class OrderStateTester
{
[Test]
public void TestOrderWithInvFound()
{
//setup - data
Warehouse warehouse = new Warehouse();
warehouse.Add("foo", 150);
Order order = new Order("foo", 50);
//setup - expectations
int expected = 150 - 50; // 100
//exercise
order.FillFrom(warehouse);
//verify
Assert.AreEqual(warehouse.GetInventory("foo“), expected);
}
}
Behavior Verification
[TestFixture]
public class OrderInteractionTester
{
Mockery mocks = new Mockery();
[Test]
public void TestOrderWithInvFound()
{
//setup - data
Warehouse warehouse =
(Warehouse)mocks.NewMock(typeof(Warehouse));
Order order = new Order("foo", 50);
//setup - expectations
using (mocks.Ordered)
{
Expect.Once.On(warehouse)
.Method("hasInventory")
.With("foo", 50)
.Will(Return.Value(true));
Expect.Once.On(warehouse)
.Method("Remove")
.With("foo", 50);
}
//exercise
order.FillFrom(warehouse);
//verify
mocks.VerifyAllExpectationsHaveBeenMet();
}
}

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Level 3®
Exercise

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Verify
PC-COF
 Partial runs are possible
 Consistent results on every test run
 Configuration is unneeded before run
 Order of tests does not matter
 Fast run time

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Verify
PC-COF
 Partial runs are possible
 Consistent results on every test run
 Order of tests does not matter
 Fast run time
 Configuration is unneeded before run

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Verify
 Don't inherit from classes you can't control.
Encapsulate and wrap it up.
 Make methods virtual by default.
 Don't use 'Sealed' unless you really have to.
 Add a setter to the singleton instance.
 Make sure a singleton always return an interface
rather than a concrete class.
 Use internal keyword to hide setters from
production code, but visible to test code.
 If possible, create an interface per class. You
never know when you're gonna need it.

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Teardown

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Teardown