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

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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