Testing/XML

Question 1

Why unit test?

Answer 1

The main goal of the unit testing is to verify the correctness of a software unit by comparing the return value of a unit with the expected result for a different set of parameter values.

Question 2

What is a software unit? (3)

Answer 2

• smallest testable part of an application
• in procedural programming, it is a function or procedure
• in Object-Oriented programming, it is a member function or method

Question 3

What are unit tests? (4)

Answer 3

• each unit test tests executes a test case
• units are tested independently of each other
• multiple test cases per unit (one per equivalence class)
• tedious to run all tests by hand –should be automated

Question 4

What are the benefits of unit testing? (3)

Answer 4

• facilitates change -automatically see if new changes break compilation
• implicit documentation -see how the code is actually used
• enforces interface/implementation split

Question 5

Why do you refactor code for testable code design? (4)

Answer 5

• to simplify code structure and its readability
• usually involves extracting complex code into a number of well-named methods
• does not necessarily shorten the code
• should make individual sections of the code easier to read and maintain

Question 6

Refactor the following code to make it more legible.

private void button1_Click(object sender, EventArgs e)
{
int num1 = int.Parse(textBox1.Text);
int num2 = int.Parse(textBox2.Text);
int total = num1 + num2;
label1.Text = total.ToString();
}

Answer 6

private void button1_Click(object sender, EventArgs e)
{
int num1 = int.Parse(textBox1.Text);
int num2 = int.Parse(textBox2.Text);
int total = FindTotal(num1, num2);
label1.Text = total.ToString();
}

private int FindTotal(int num1, int num2)
{
int total = num1 + num2;
return total;
}

Question 7

What are the testing frameworks for C++?

Answer 7

• Boost.Testinglibrary
• CPPUnit
• CxxUnit

Question 8

What are the testing frameworks for NET languages?

Answer 8

• Nunit
• xUnit.net
• MbUnit
• QuickUnit.net
• csUnit

Question 9

What is the testing framework for Java?

Answer 9

Junit

Question 10

List the Visual Studio 2012 test tools. (4)

Answer 10

• Test Explorer
• Microsoft unit test framework for managed code and C++
• Code coverage tools
• Microsoft Fakes isolation framework

Question 11

What does the Test Explorer in Visual Studio do?

Answer 11

It lets you run unit tests and view their results.

Question 12

What does the Microsoft unit test framework for managed code and C++ do?

Answer 12

It provides a framework for testing .NET code and native code.

Question 13

What do Code coverage tools do?

Answer 13

They determine the amount of product code that your unit tests exercise.

Question 14

What does the Microsoft Fakes isolation framework do?

Answer 14

It creates substitute classes and methods for the code under test.

Question 15

All the methods and classes generated for the automated unit testing are inherited from the namespace …

Answer 15

Microsoft.VisualStudio.TestTools.UnitTesting

Question 16

What are the general steps to take in unit testing? (4)

Answer 16

• Create a unit test project
• Add a reference to the code project under test
• Write the test
• Build and run the test

Question 17

•The AAA (…) pattern is a common way of … for a method under test.

Answer 17

Arrange, Act, Assert

writing unit tests

Question 18

What happens at the Arrange stage of unit testing?

Answer 18

It initializes objects and sets the value of the data that is passed to the method under test.

Question 19

What happens at the Act stage of unit testing?

Answer 19

The Act section invokes the method under test with the arranged parameters.

Question 20

What happens at the Assert stage of unit testing?

Answer 20

The Assert section verifies that the action of the method under test behaves as expected.

Question 21

What do Test Explorer views do?

Answer 21

• display all of your tests, or only the tests that have passed, failed, haven’t been run yet, or have been skipped
• filter the tests by matching text in the search box at the global level or by selecting one of the pre-defined filters
• run any selection of the tests at any time

Question 22

kk

Answer 22

[TestMethod()]is required in the Microsoft unit testing framework for managed code for any class that contains unit test methods that you want to run in Test Explorer.