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5）Visual Studio 2010 Tools - To improve code quality

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In this article, I am going to present a step by step demo on how to
improve code quality by using Visual Studio Tools like:

Unit Testing: Writing piece of code to test another piece of code or
functionality.
Code Coverage: This tells what lines of code getting executed during testing
process.
Test Impact Analysis: This tells what test need to be run depending on under
line code changes.

Following tables shows features availability in different Visual Studio
2010 editions.

	Professional	Premium	Ultimate
Unit Testing	Yes	Yes	Yes
Code Coverage	No	Yes	Yes
Test Impact Analysis	No	Yes	Yes

Step 1 : Create class library

Class Library Name: MathLibrary

Class Name: CalculateBasic

Methods: AddNumbers, SubtractNumbers, MultiplyNumbers and DivideNumbers as
shown below

Step 2 : Create Unit Test

Right any method and click "Create Unit Tests"

Window will pop up. Select all methods and set Test Generation settings for
file, class and method name. Click OK.

Enter project name Unit Test project.

New project created "MathUnitTest" with class CalculateBasicTest.cs having
test methods for AddNumbersTest, SubtractNumbersTest, MultiplyNumbersTest and
DivideNumbersTest as shown below. Remove Assert.Inconclusive statement from each
method.

Step 3 : Test Unit Test

Click on Test Menu and select Run --> All Test in solutions.

Here DivideNumbersTest fails because this unit test is trying divide by
0.

Change code to handle if 0 value is passed.

Again click on Test Menu and select Run --> All Test in solutions. And
now all tests are passed.

Step 4: Enable Code Coverage and Test Impact Analysis

To enable Code Coverage and Test Impact Analysis, click on Test --> Edit
Test Settings --> Local (local.testsettings)

Test settings windows pops up.

Select Data and Diagnostics on left menu
On Right side bottom screen, select Code Coverage and Test Impact
Select Code Coverage and click Configure

A new windows pops up. Select assemblies to be included for Code Coverage.
Here select both MathLibrary and MathUnitTest. Click OK.

Step 5: Check Code Coverage

Now again run all Unit Tests.

All result is passed. Right click any test and select Code Coverage
Results.

It shows code coverage in terms Not Covered and Covered lines by Unit
Tests. Here Add, Subtract and Multiply method Covered Lines = 3 and Not Covered
lines = 0. This shows that Unit Test covered all code. The Divide method Covered
Lines = 4 and Not Covered lines = 2. This shows Unit Test has not covered 2
lines of code. Right Click as show below and click Go to source code.

The source code is divided in to two colors

Code Covered
Code Not Covered

Step 6: Test Impact Analysis

The purpose of test impact analysis is to check the impact of any code on
Unit Test.

Change the Subtract and Multiply Numbers method to as shown below.

For Test Impact Analysis, Click on Test --> Windows --> Test Impact
View

Build the solution and the Test Impact view window shows the list of
impacted test.Here is shows Multiply and Subtract Numbers method as we have
changed earlier.

Right Click Unit Test and select Run All Impacted Tests.

It shows both impacted test is passed.

Again from here you can view the Code Coverage results.

Conclusion:

In this article I have tried to explain that by using Unit Testing, Code
Coverage and Test Impact analysis how we can improve the quality of code.
Analyzing these things helps during our code review process and also if there is
any code change we can do the Test impact analysis.

做个快乐的自己。