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Test Plan: Introduction

Test Plan: Introduction. Primary focus: developer testing Implementation phase Release testing Maintenance and enhancement Secondary focus: formal system verification Addressed within current test plan via examples Assumed to be primarily independent. Tests to be Performed.

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Test Plan: Introduction

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  1. Test Plan: Introduction • Primary focus: developer testing • Implementation phase • Release testing • Maintenance and enhancement • Secondary focus: formal system verification • Addressed within current test plan via examples • Assumed to be primarily independent

  2. Tests to be Performed • Bottom-up integration testing • Build a module, build a test to simulate how it is used • Black-box • Based on specification and ‘educated guess’ stress tests • White-box • Based on code inspection • Platform testing • Establish baseline capability of hardware/OS, detect differences • Performance • Per module, and peer to peer distributed costs • Test coverage • Coverage level dependent on resources, time, and cost of failure

  3. Allocation of Testing Responsibilities • Assumption: development team performs • Internal (module-level) performance • Sample system performance (limited example federation) • Full white-box • Limited black-box (basic system functionality) • Assumption: external group performs • Independent, detailed system verification (Spec compliant) • Standardized performance tests • Test coverage • Coverage will be measured, analyzed for relative effectiveness • Coverage levels TBD

  4. Testing Philosophy • Testing is not just pre-release! Continual process within development phase • Catch defects as early as possible • Make sure defects stay fixed • Track cause of defects: repair problem, do not keep re-patching the tire • Need support at both design level and implementation level to accomplish these goals

  5. Continual Testing Process • Tests created during development • Central code repository: modules, test suites tied together • Tests are treated as live code to be maintained, not ‘once-offs’ • Test documentation: how to run, what is tested, and why • Revision control on both modules and tests • Modular development • System broken down into hierarchies of testable components • Automated, incremental integration testing • As code is developed, it is tested standalone, then incrementally within the confines of the system • Continual feedback into development, maintenance cycle • Weekly postings of performance results, current defect status

  6. Design Support • Standard testing and debugging methods on each module / class (peek, dump, exercise, performance) • Self-checking code (pre and post parameter asserts, valid state calls) • Debug levels, controlled via runtime flags • Centralized logging mechanisms to collect distributed traces • Logs used in both developer testing and sample user traces from the field

  7. Development Tool Support • Shadow development trees for automated and individual testing (ClearCase ‘views’) • Common testing tools, testing approach to simplify testing process, and to allow automated testing • Examples: • Standard test harnesses, method of invocation • Standard testing directories, makefile commands per module • Standard set of test-record-evaluate tools • Central I/O mechanisms to collect distributed test results • Standard system-level drivers • Sequential test harnesses and emulated distributed harnesses to emulate determinism during development

  8. Levels of Testing per Module • Basic: used in initial development, later in porting • Minimal level of functionality to establish module operation • Simplicity is critical during development, porting • Detailed: used to verify module correctness before checking into current baseline • Does module meet interface contract • Tests for common coding errors • Regression: replicates previous use which caused failure • Used to verify defect has been corrected • Used to ensure defect does not re-occur over time • Performance: tracks the CPU usage per module and peer to peer performance across distributed components

  9. Complex Functional Areas: Testing Examples • Memory: continual test for memory leaks and over-writes • Automated use of Purify within weekly test suites across all modules, all levels of the system • Threads: platform-specific performance and implementation variances must be established per platform • Standard set of tests which mimic system use of threads • Causality: complex areas of the system (such as zero-lookahead ordering) are difficult to establish correctness across all use cases (dropped packets, simultaneous time stamps with variable arrival times, cancelled events, …) • Detailed test scripts, executed in deterministic test harnesses with varying error conditions

  10. Periodic Testing Activities • Code walkthroughs: encompass both system code and associated test suites. Testing focus: • Do the test suites sufficiently stress the module • Do the test suites still accurately represent the expected use of the module • Has the underlying platform changed, and has performance changed accordingly • Change Control Board: formal tracking process and tools to establish, record and monitor status of functional change requests, defect priority and status data

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