Testing Workflow Purpose

Purpose
• Verify the result from implementation by testing each build
• Plan the tests in each iteration
• Integration tests for every build within theiteration
• System tests for the end of the iteration
• · Design and implement tests by creating
• test cases that specify what to test
• test procedures that specify how to perform the tests
• executable test components to automate the tests
Slide 1

Testing Workflow Flow
Slide 2

Testing Workflow with Phases
Slide 3

Testing Workflow in Phases
Generally, when there is an implementation result, there is a test --- so Test at each build
Inception phase: initial test planning, prototype testing
Elaboration phase: test architectural baseline
Construction phase: significant testing at each build
Transition phase: re-test fixes and regression tests
Slide 4

Testing Workflow Other Tasks
Regression tests: in a new build, re-apply tests from old builds to make sure nothing “broke” in new build
Evolve test model create new test cases for next build refine prior test cases into regression tests remove obsolete tests and corresponding test procedures and components
Slide 5

Testing Workflow Models
Test model artifacts
Test cases
Test procedures
Test components
Test subsystem packages for complex test
Other artifacts
Test Plan
Defects
Test Evaluation
Slide 6

Testing Workflow Model
TEST MODEL
Describes how executable components (e.g., builds) in the implementation model are tested by integration tests and system tests
Describes how specific system aspects are to be tested e.g., usability testing of user interface or user manual
Slide 7

Testing Workflow – Test Case
TEST CASE
Specifies one way to test the system
What to test (requirements)
With which inputs
Expected results
Test conditions and constraints
Slide 8

Testing Workflow Test Cases
TEST CASE EXAMPLES
Test a use case or a scenario in a use case
(black box) § actor interaction, pre-conditions, action sequences, post-conditions
Test a use-case realization (white box) verify interaction between components.
Installation tests, configuration tests, negative
(abuse) tests, stress tests
Organize similar tests in input/result matrix
Family of test for different paths through a use case
Slide 9

Testing Workflow Special Tests
Installation tests verify the system can be installed on the customer platform and that it executes correctly when installed
Configuration tests verify the system works correctly in different configurations
Negative tests (abuse tests) what causes failure
Test outside the intended design, e.g., wrong configuration, wrong input, etc.
Reveals weaknesses in design
Stress tests show problems with insufficient or shared resources
Slide 10

Testing Workflow Procedures
Specify how to perform one or several test cases or parts of them
Instructions for tester in manual test case
Instructions for interacting with test automation tool to create executable test components, then instructions to integrate and execute those test components
One test procedure may cover several test cases
One test case may require several test procedures
Test procedure instructions often reflect flow-of events descriptions, including input values, how to enter input values, and how to verify results
Slide 11

Testing Workflow Components
Automate one or several test procedures or parts
Provide test inputs, control and monitor test execution, and possibly analyze and report results
Developed with scripting languages, programming languages, or test automation tools test drivers, test harnesses, and test scripts
Complex test cases and procedures may require formal analysis, design, and implementation modeling of the test components
Slide 12

Testing Workflow Plan
·
Describes testing strategies, resources and schedule
Strategy
What kind of tests to perform for each iteration
Test objectives
Required level of test and code coverage
Test acceptance criteria
Trade-off cost vs. improved quality and reduced risk
Test Plan may be defined in conjunction with the model artifacts from other workflows analysis (black box) design and implementation (white box)
“Tests” may include artifact reviews
Slide 13

Testing Workflow Results
Results are the output data of the test and/or the behavior of the system during test
Analysis of results: pass or defect
Defect: a system anomaly (software fault or a defect found in artifact review) capture symptom in sufficient detail to allow problem resolution capture defect in problem and resolution tracking system
Test evaluation: summary of overall test results test-case coverage, code coverage defects and defect status
Slide 14

Testing Workflow Results
Slide 15

Testing Workflow Workers
Test designer : responsible for integrity of the test model plan tests: test goals and schedule select and define test cases, test procedures evaluate test results
Component engineer : responsible for development of test that automate some of the test procedures consider independent test components
Slide 16

Testing Workflow Workers
Integration tester : perform integration tests and report defects may be same person as system integrator in implementation workflow
System tester : perform system tests and report defects focus on externally observable behavior consider users, beta customers, etc. as testers
Slide 17

Testing Workflow – THE PLAN
Plan the Tests Strategy and Resources
Define Integration Tests
Define System Tests
Design Regression Tests
Define and Mutate Test Cases
Implement Tests
Evaluate Tests
Slide 18

Testing Workflow – THE PLAN
Plan the Tests Strategy and Resources
Describe testing strategy
Inputs: use case model, supplemental requirements, design model
Develop test cases and procedures that have a minimum of overlap test the most important test cases test high risk requirement items
Estimate resources
Estimate human and system resources
Schedule the testing effort
Slide 19

Testing Workflow – THE PLAN
Define Integration Tests
Derive test cases from use-case realizations – design (component interaction)
Develop tests with minimal overlap that test an interesting path or scenario through use case
Primarily consider interaction diagrams
Combinations of actor input, output and system start state that lead to interesting scenarios that employ the classes that participate in the diagrams
Slide 20

Testing Workflow – THE PLAN
Define System Tests
Test system as a whole
Test combinations of use cases instantiated under different conditions
Hardware configurations
System loads
Number of actors
Database size, etc.
Prioritize combinations required or are likely to function in parallel likely to influence each other if in parallel involve multiple processes frequently use system resources or use them in complex and unpredictable ways Slide 21

Testing Workflow – THE PLAN
Design Regression Tests
Modify test cases from earlier builds to be used as regression tests in subsequent builds
Make more flexible and resilient to changes to the system under test
Specifically address previously found defects
Automate where possible
Slide 22

Testing Workflow – THE PLAN
Define and Mutate Test Cases
Work test case by test case and suggest testing procedures for each one
Reuse existing test cases
May need to modify them to be reusable
Align test procedures to subsystems under test
Minimize overlap
Isolates change to test resulting from change to subsystem
Slide 23

Testing Workflow – THE PLAN
Implement Tests
Create test components from test procedures
With test automation tools
Perform or specify actions
Record actions as a test component
When programming explicitly
Design and implement using test procedures
Provide input and output data generation, visualization, interpretation and management utilities
Use spreadsheets and database applications
Slide 24

Testing Workflow – THE PLAN
Evaluate Tests
Perform the integration tests relevant to a build
Manually perform test procedures
Compare test results with the expected test results
Investigate test results that deviate from the expected
Faulty system and/or faulty test?
Report defects to the component engineer responsible for the components likely to contain the fault
Report defects to the test designers for evaluation of overall test results
Slide 25

Testing Workflow – THE PLAN
Evaluate Tests (cont)
Test designers prepare metrics of test acceptance with respect to system quality level
Test completeness and coverage
Percentage of test cases executed
Percentage of code and paths tested
Reliability
Categorize defect severity
Analyze trends of discovered defects
Compare with prior experience to predict amount of testing still required to reach an acceptable defect leve
Slide 26

Testing Workflow – THE PLAN
Evaluate Tests (cont)
Suggest actions
Suggest further tests
Relax test criteria
Deliver parts of the system that passed; rework and retest parts that failed
Document test completeness, reliability and actions
Slide 27

Testing Workflow – SUMMARY
Test Model
Test cases specify what to test
Test procedures specify how to perform tests
Test components automate test procedures
Test Plan
Test Evaluation
Defects to be fed into other core work
Slide 28