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Automated Testing with Team Test
Unit, Web, Performance, Load, Manual, and Ordered Tests
Code Coverage and Code Analysis

2 For Discussion Purposes Only | © 2007 Computer Enterprises, Inc.
Quality Challenges
“Software bugs, or errors, are so
prevalent and so detrimental that they
cost the U.S. economy an estimated
$59.5 billion annually, or about 0.6
percent of the gross domestic
product…an estimated $22.2 billion,
could be eliminated by an improved
testing infrastructure that enables
earlier and more effective
identification and removal of software
defects.”
(Source: NIST 2002)
Satisfying
users
Business
interruption
risks
Ongoing
maintenance
costs rising
Less avail.
resources

How Does VSTS/TFS Help?
 Increased Communication and Integration…
 Code Analysis Tools
 Code Profiling Tools
 Unit Testing and Code Coverage
 Load Testing
 Other Testing Tools
 Test Case Management

Unit Testing
 Each unit is tested
independently
 A large percentage of
defects are identified during
unit testing
 Automatic and repeatable
code testing
 Simplifies integration
 Self documenting
 Auto-generate
Isolate small portion of code & determine whether it works correctly

Benefits of Automated Unit Testing
 Repeatable unit that verifies code still works
 Confirm code is tested
 Build a set of regression tests
 Make changes with confidence
 Aid in understanding code
 Limits: integration, web and Windows UI testing, load,
performance testing

Unit Test Types
 Class (standard)
– Test the properties and methods of a class
 Data-driven
– Bind unit test parameters to a datasource
 ASP.NET
– Test classes (or business logic) inside an ASP.NET application
– Run in the context of the web server (ASP objects available)
 Web Services
– Define a web reference to the service

Extensions of Unit Testing
 Regression Testing
– Modifications are validated with regression tests
– Write new code and verify system continues to function
correctly
 Integration Testing
– Helps validate how tested components interact with
one another
– Can identify problems that occur when units are
combined
 Scenario Testing
– Combine sequence of unit tests to cover a scenario

Writing Effective Unit Tests
 Atomic
– Should not require others tests to be run first
 Cover all cases
– One test for each sceneario
– Cover all conditions, exceptions, nulls, etc.
 Able to re-run without configuration
– Database create/read/update/delete without having to
modify the database before or after the test is run
 Test a common application state
Unit tests should be …

Unit Test Conditions
 Success baseline
– Common, successful, most-likely call to your code
 Parameter mix
– Pass a varied set of parameters
– Data-driven
 Bounds checking
– Stress the upper and lower limits of your parameters
 Null values
– Determine outcome of passing nulls to parameters
 Error conditions
– Trigger error conditions and validate expected outcomes
 Code coverage scenarios
– Test all conditions in your code

Creating Unit Tests (1 of 2)
 Attributes are used to denote which methods and classes should be
loaded for tests
– TestClass – denotes a class for testing
– TestMethod – denotes a method for testing
• must return void (Sub for VB.NET) and have no parameters
 Certain attributes are associated with initialization
– TestInitialize – run before each test
– TestCleanup – run after each test
– ClassInitialize – run once before running any tests in the class
– ClassCleanup – run once after running all tests in the class
 Assert – static type used for asserting test values
 ExpectedException – attribute used for determining the exception that
should be thrown from the test

Creating Unit Tests (2 of 2)
 Methods on the Assert type
– AreSame / AreNotSame
– AreEqual / AreNotEqual
– IsNull / IsNotNull
– IsInstanceOfType / IsNotInstanceOfType
– IsTrue / IsFalse
 Other Assert types
– CollectionAssert – collection equivalency
– StringAssert – string comparison/regex matching
 Web test types
– HtmlDocument – grants access to tags in the html document
– Validate*/Extract* - types used for reading field values from the
request and response

Code Coverage
 Improves effectiveness of tests
 Show a measurable indication
of code that was covered by
unit tests
– Strive for 75% and higher
 Shows the ratio of executed
logic to the total logic
 Can be used in conjunction with
unit and load testing
 Helps to find unused code
Determine code that is exercised by tests

Static Code Analysis
 Provides a means to enforce coding standards
 Configurable
 Reduction in code reviews for small issues
 Provides guidance on how to fix
 Define a check-in policy to enforce code analysis pass
 Coverage includes issues with design, globalization, interoperability,
maintainability, naming, performance, reliability, security, and usage
 Warning: developers can supress messages with attirbute
[SuppressMessage("AdventureWorks.Rules", "AW14441")]
 MORE INFO see, “Writing Quality Code” in TFS documentation

Web Testing
 Record page navigation
and user interactions with
web pages
 Run tests back to
determine errors
 Seed tests from a
database
 Run tests from a group of
users
 Validation rules
 Extractions

Load Testing
 Load Testing: ensure application works under expected, concurrent
user load
 Create test cases that simulate real user conditions
 Distribute tests across cases based on user behavior
 Assume standard think times
 Distribute across connection types
 Simulate an application performance
in a production environment
 Provide repository to look at a
performance trend over time, to see
if changes are helping or hurting
Simulate multiple users against an application simultaneously

Stress Testing
 Stress Testing: determine breaking points in your
application
 Find scalability issues before the application is deployed
 Step (increase) user load over time, monitor
 Find breaking point and use to monitor application
– Change software
– Add hardware

Performance Testing
 Test at single user
 Test at normal load
 Test at peak load (1.5x normal load)
 Measure against expected performance
– Peak load should allow for a 20-30% increase in metric
 Set thresholds on the output to avoid digging through data

Load, Stress, and
Performance Testing

Manual Test
 Tracked like other tests when executing test groups
 Presented to the tester to enter and confirm results
 Defined as text file or Word document

Generic Test
 Wrap existing code
and have that code
executed as part of
the testing process
 Centralized results
of all tests

Ordered Test
 Test to group (and
order) other tests
 Results of ordered
tests either succeed
or fail as a group
 Used for scenario and
module-level testing
 Add any test except a
load test to an
ordered test

Test Case Management
 Organize tests into lists
 Run tests
 Filter and group the
display of the tests
 Import additional tests
 Export tests
Organize and manage test cases

The Test Lab
 Clients
– Tester machine
– Used to create and edit tests / view results
 Servers
– Deployed test environment (web servers, load balancer, database server,
etc.)
 Agents
– Computers running tests (multiple-threads, each a user)
– Listen for commands from controller
– Execute tests and pass results back to controller
 Controller
– Central computer that administers agents and collects results
– Distributes load by applying weights to agents

The Test Lab Database
 Run against a test version of the database
 Test data should be same nature and size as production
 Test a steady state of the database
 Automate the initialization of the database
 Extract data using rules to obfuscate personal information
– Visual Studio Database Developer

Test Lab Database Initialization

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