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Test Requirements: The Basis of Testing

Test Requirements: The Basis of Testing. David Capocci, CQA, CSTE Sr. QA Systems Analyst SAFECO Corporation davcap@safeco.com. Agenda. Defining Test Requirements (TR) What, Why, Where Fitting TR’s into the testing picture What’s within our testing process Generating TR’s

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Test Requirements: The Basis of Testing

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  1. David Capocci, CQA, CSTE Test Requirements:The Basis of Testing David Capocci, CQA, CSTE Sr. QA Systems Analyst SAFECO Corporation davcap@safeco.com

  2. David Capocci, CQA, CSTE Agenda • Defining Test Requirements (TR) • What, Why, Where • Fitting TR’s into the testing picture • What’s within our testing process • Generating TR’s • Organizing & Decomposing TR’s • Test Requirements Hierarchy Samples • Setting the stage for measuring test coverage

  3. David Capocci, CQA, CSTE Background • “Test Requirements Hierarchy” is a term coined from Rational’s SQA Team Test software. • The principle of identifying, organizing, and measuring test requirements is universal to many test processes and methodologies • Much of this in-service is distilled from: • Rational methodologies (we are an SQA Team Test house after all) • QAI Workbench model • Seminar topics from • 19th annual International Software Testing Conference • Star ‘98 West Conference • Ed Kit’s “Software Testing in the Real World”

  4. David Capocci, CQA, CSTE Test Requirements • What exactly is a Test Requirement? • Why identify Test Requirements? • Where does a Test Requirement come from? Defining TR’s: What, Why, Where

  5. David Capocci, CQA, CSTE What exactly is a Test Requirement? • Identifies the “WHAT” of testing • What needs to be tested, AND • What are you going to validate about it • Includes both normal and error conditions • Covers business rules, functionality, non-functional standards • Do NOT have case specific data values assigned to them yet (data appears in test cases, the “How” of testing) examples… Defining TR’s: What, Why, Where

  6. David Capocci, CQA, CSTE “Validate that you can insert an entry” “Validate that insertion fails if entry already present” “Validate that insertion fails if table already full” “Validate that you can insert an entry to an empty table (initial)” These are test requirements NOT tests because they do not describe the data element being inserted The data is irrelevant at this level, it will appear in the test cases used to cover these test requirements “Validate you can insert ‘John Doe’” is a test case not a test requirement Example 1: Testing the inserting of a record to a table Test Requirements Identified (among others): Defining TR’s: What, Why, Where

  7. David Capocci, CQA, CSTE Why identify Test Requirements? • It’s what QC “owns” in our workbench: Requirements-based or Function-based testing • It’s the basis for establishing the completion of testing • Helps determine the scale of the testing effort • Governs the types of resources you will need • Serves to identify automation strategies you can use • Becomes a roadmap for your testing effort • Can be a tool for leverage and dialog with developers and business analysts • Dev Team can sign off on them (Verification!) Defining TR’s: What, Why, Where

  8. David Capocci, CQA, CSTE Where does a TR come from? • Traditional: Business Requirements, functionality, internal logic… • Marketing specs, Functional specs, Technical specs • Reality: • “Interview Analysis”, Non-Functional Checklists (standards & compliance), Use Cases (from business scenarios and users), Discovery during testing, any other deliverables from previous workbenches (diagrams, modeling, flowcharts, etc.) Defining TR’s: What, Why, Where

  9. David Capocci, CQA, CSTE How do Test Requirements relate to the Test Plan? • Traditionally, the Test Plan has represented “what” was going to be tested, even including test cases. • Paradigm is shifting: Test Plan should relate what your testing process (and deliverables) will be for a particular project. • A Test Plan should build confidence in the testing process for a project, making approaches clear. • A Test Plan can include the Test Requirements • However, if the Test Requirements are too lengthy, they should become their own document: A Test Requirements Hierarchy Defining TR’s: What, Why, Where

  10. David Capocci, CQA, CSTE Agenda • Defining TR’s: What, Why, Where • Fitting TR’s into the testing picture • What’s within our testing process • Generating TR’s • Organizing & Decomposing TR’s • Test Requirements Hierarchy Samples • Setting the stage for measuring test coverage

  11. David Capocci, CQA, CSTE Drilling down: Where test requirements fit into the picture Business Requirement 1 Test Generates Requirement M 1 Test Executes/Runs Scenarios/ M Generates M Cases 1 Test Procedure/ Script Fitting TR’s into the testing picture

  12. David Capocci, CQA, CSTE Drilling Down First, Let’s look at this relationship: What’s within our testing process Business Requirement Test Requirement Test Scenarios/ Then we’ll look at this relationship: Gernerating TR’s from what feeds into our testing process Cases Test Procedure/ Script Fitting TR’s into the testing picture

  13. David Capocci, CQA, CSTE Business Requirements: - “ATM must do withdrawals” - “Withdrawals are between $20-$300” - “Withdrawals are in $20 multiples” Group Exercise! 1. Limit the scope to these 3 requirements. 2. What will you validate (test for)? 3. Are there any implied requirements that may not be written out? ATM Example: Practice Writing Test Requirements What’s within our testing process

  14. David Capocci, CQA, CSTE “Validate that a withdrawal option is available” "Validate that a withdrawal of a multiple of $20, between $20-$300 can be done" "Validate that <$20 is not allowed" "Validate that >$300 is not allowed" "Validate that $20 multiples >$300 is not allowed" "Validate that non-$20 multiples between $20-$300 not allowed" "Validate strange numeric amounts/combinations not allowed (all zero's, all 9's, 20.0000)" “Validate that the withdrawal received is equal to the amount requested” "Validate that a valid withdrawal amount must be below the account balance” These are test requirements NOT tests because they do not describe the data element being used (like $20, $40, $60, $1) The data is irrelevant at this level, it will appear in the test cases used to cover these test requirements Example 2: Testing Withdrawals on an ATM Test Requirements Identified (among others): What’s within our testing process

  15. David Capocci, CQA, CSTE Test Scenarios/Cases for -“Validate that a withdrawal of a multiple of $20, between $20-$300 can be done” What’s within our testing process

  16. David Capocci, CQA, CSTE Step 1: Insert Card Step 2: Enter PIN Step 3: Select Withdraw option Step 4: Enter dollar amount Step 5: Validate amount received Do until EOF ‘until end of data file Input data record Senddata CARDINFO to “Cardfield” Senddata “Enter” Senddata PIN to “PINFfield” Senddata “Enter” Senddata “W” to “SelectionField” Senddata AMOUNT to “DollarField” Senddata “Enter” If ErrorMsg > 0 then print ErrorMsg Print “DollarAMTgiven” Loop Test Procedure & Script for previous example Procedure: Script: (in pseudo-code ) Think Manual ! Think Automated ! What’s within our testing process

  17. David Capocci, CQA, CSTE Agenda • Defining TR’s: What, Why, Where • Fitting TR’s into the testing picture • What’s within our testing process • Generating TR’s • Organizing & Decomposing TR’s • Test Requirements Hierarchy Samples • Setting the stage for measuring test coverage

  18. David Capocci, CQA, CSTE Rework Product Input Check Product Output DO DO EntranceCriteria Exit Criteria Standards Tools The Workbench Concept Our workbench is called “Generating Test Requirements” Generating TR’s

  19. David Capocci, CQA, CSTE Entrance Criteria for BusinessRequirements to generate Test Requirements • Visible ? • Clear? (unambiguous) • Complete? • Consistent? (conflicting requirements must be prioritized) • Reasonable? (achievable) • Measurable? (quantifiable) • Modifiable? (will it change or is it stable?) • Traceable? (the source is known) • Dependent requirements identified? • Testable? (given current environment, resources, skills) Generating TR’s

  20. David Capocci, CQA, CSTE Exit Criteria for Test Requirements • Can another tester create test cases/scenarios from these? • Does a Test Requirement specify what is being tested and what about it we are validating? (Clear?) • Are the Test Requirements… • Complete? • Consistent? (conflicting requirements must be prioritized) • Reasonable? (achievable) • Measurable? (quantifiable for measuring test coverage) • Modifiable? (will it change or is it stable?) • Traceable? (the source is known) • Testable? (given current environment, resources, skills) • Do the test requirements cover the complete scope of the project? • Are all the test requirements verified and signed off by the Development Team? Generating TR’s

  21. David Capocci, CQA, CSTE When creating Test Requirements (“Do”)... • Use “action” verbs & words • “Validate that…” • “Check for…” • “Test that…” • Trace them back to the source • Remember that different applications arrange in different ways • Think of MF, batch, C/S, web, e-commerce, GUI, etc. • Use “testing considerations” checklists that generally cover what kinds of things should be considered when testing your specific situation • Make your Test Requirements document a “living document” Generating TR’s

  22. David Capocci, CQA, CSTE Also... • Maintain a level of balance between too much & too little • Too High level: won’t be useful, vague, can’t generate test cases from it. • Too low level: Over-process, over documentation, no productivity • General rule: 5-7 levels deep in an outline format • Organize them! • Outline/Hierarchy format recommended • Look at how the BA breaks down the project into areas • Look at how the PA breaks down the project into areas • Organize by functional areas • Organize by “types” of testing (Function vs. System vs. Non-Functional) Generating TR’s

  23. David Capocci, CQA, CSTE Agenda • Defining TR’s: What, Why, Where • Fitting TR’s into the testing picture • What’s within our testing process • Generating TR’s • Organizing& Decomposing TR’s • Test Requirements Hierarchy Samples • Setting the stage for measuring test coverage

  24. David Capocci, CQA, CSTE Distinguishing the types of testing…. IX. Stress Tests (breaking point: memory, resources) X. Resource Usage Tests XI. Documentation Tests XII. Compatibility Tests XIII. Recovery Tests XIV. Serviceability Tests and others… *III - XIV are all “Systems-based tests” I. Function-Based Tests II. User Interface Tests III. Security Tests IV. Installation Tests V. Configuration Tests VI. Performance Tests (Response) VII. Load Tests (simultaneous users, lots of small transactions) VIII. Volume Tests (Big transactions) Organizing TR’s

  25. David Capocci, CQA, CSTE Organizing by Functional areas…. • Most testers perform function-based, or requirements-based tests • Tests on functionality that the system will provide • Usually scenario/case based • includes normal and alternate (invalid) cases Organizing TR’s

  26. David Capocci, CQA, CSTE Organizing by Functional areas…. • Most testers also perform User Interface Style Tests • These are generally separate from the functionality that the software will provide • Usually encompass the architectural standards & compliance (like Windows Design Standards) • Also includes tests of navigation, menus, admin functions (like printing, saving) Organizing TR’s

  27. David Capocci, CQA, CSTE Agenda • Defining TR’s: What, Why, Where • Fitting TR’s into the testing picture • What’s within our testing process • Generating TR’s • Organizing &DecomposingTR’s • Test Requirements Hierarchy Samples • Setting the stage for measuring test coverage

  28. David Capocci, CQA, CSTE Remember this?…Drilling down Fitting TR’s into the testing picture

  29. David Capocci, CQA, CSTE Business Function Tasks within the Function Transactions to perform a task Data Entry Types for transactions Field Validation Decomposing: Drilling down within a Test Requirement Business Requirement Test Requirement Keep the function-based perspective in mind! Test Scenarios/ Cases Test Procedure/ Script Fitting TR’s into the testing picture

  30. David Capocci, CQA, CSTE Test Requirement Decomposition Decomposing TR’s

  31. David Capocci, CQA, CSTE Test Requirement Decomposition High level Functional Areas: usually from “Functional Spec” type docs, or BA work Business Function Tasks within the Function Transactions to perform a task Lower level Functional Areas: usually from “Technical Spec” type docs regarding internal logic, or PA work Data Entry Types for transactions Field Validation Decomposing TR’s

  32. David Capocci, CQA, CSTE Test Requirement Decomposition • You can start on the high level functional areas early into the project & build in lower level areas as they become available • Any level can contain a test requirement which can also be made up of (or broken down into) lower level test requirements Decomposing TR’s

  33. David Capocci, CQA, CSTE Business Function Level • Try to identify “groups” of functions or functions connected by similar themes file management functions, printing functions, help functions, car rental functions, reservation functions, ticket purchase functions, claim reporting functions • Be sure all areas of the system are covered. If something is left out or doesn’t fit into a group, it becomes its own group. • It may be easier to identify functional areas by “window” instead of by function. Trans Data Type Field Validation Function Task Transaction Decomposing TR’s

  34. David Capocci, CQA, CSTE Business Function Level • At this level, the idea is seeing the connections, integration, and interactions of the system’s functionality. • May not necessarily be identifying a test requirement at this level as much as just identifying the functional area. Trans Data Type Field Validation Function Task Transaction Decomposing TR’s

  35. David Capocci, CQA, CSTE Task Level • Break down each Function area into the tasks within the function • For complex tasks, it is possible to break them down further into sub-tasks • Some Business Functions can not decompose into further tasks (example: Check Writing function) Trans Data Type Field Validation Task Function Transaction Decomposing TR’s

  36. David Capocci, CQA, CSTE Transaction Level • From this level down, we start to address the internal things that occur to make the functions and tasks happen • Identify any logical transactions that ties the task to the database or any other transactions necessary to perform the task. • Identify any data processing, calculation, data formatting type transactions Note: A screen or window may cause the execution of several different logical transactions Trans Data Type Field Validation Transaction Function Task Decomposing TR’s

  37. David Capocci, CQA, CSTE Transaction Data Type Level • Identify which of the four types the transaction can become: Add, Change, Delete, Inquire • It is entirely possible that a transaction can be multiple types. • If a transaction is only one type, you can wrap this level up into the higher level. Trans Data Type Field Validation Function Task Transaction Decomposing TR’s

  38. David Capocci, CQA, CSTE Field Validation Level • Most testers like to jump directly to this level. It’s the most obvious at times. • Field validation covers all edits & cross edits on fields and data. • Be careful of the detail you document at this level. Remember the separation between test requirement and test case. Field Validation Trans Data Type Function Task Transaction Decomposing TR’s

  39. David Capocci, CQA, CSTE Field Validation Level • Not all test requirements (especially at this level) fit well to be documented in this manner. • Example: Testing all the stated properties of windows objects • Use “Validate that the properties of all the objects in this window match the properties listed on the Object Properties Reference Table in Appendix B upon initialization of the window” • Don’t list each property check as a separate test requirement if it can be summarize under one test requirement • This is a judgement call YOU make for your given project. Field Validation Trans Data Type Function Task Transaction Decomposing TR’s

  40. David Capocci, CQA, CSTE Example 3: Rental Car Application 1. Validate that a Rental can occur. 1.1 Check Customer policy coverage 1.2 Query Car availability 1.3 Query Car rates 1.4 Open a Rental ticket 1.4.1 Validate that a customer record can be entered 1.4.2 Validate that credit card approval is obtained 1.4.3 Validate that status on the car record is changed from “waiting” to “rented” 2. Billing Function 3. Reservation Function Let’s look at the lower levels for this one Then we’ll try it on this one Decomposing TR’s

  41. David Capocci, CQA, CSTE Example 3: Rental Car Application 1. Validate that a Rental can occur. 1.4 Open a Rental ticket 1.4.1 Validate that a customer record can be entered 1.4.1.1 Validate that a new customer can be added to the customer table 1.4.1.1.1 Validate that the first name is all alpha 1.4.1.1.2 Validate that the age is > 21. 1.4.1.1.3 Validate that the phone number is numeric 1.4.1.1.4 Validate area code is an existing area code number. 1.4.1.2 Validate changing an existing customer Decomposing TR’s

  42. David Capocci, CQA, CSTE Example 3: Rental Car Application 1. Validate that a Rental can occur. 1.4 Open a Rental ticket 1.4.2 Validate that credit card approval is obtained …fill in the lower level test requirements! First, Identify any sub-areas (further tasks, or even separate transactions within this) Then, Identify the lowest level field validation test requirements (think about what is typically involved with credit card authorizations) Decomposing TR’s

  43. David Capocci, CQA, CSTE What did you come up with? 1. Validate that a Rental can occur. 1.4 Open a Rental ticket 1.4.2 Validate that credit card approval is obtained _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ Decomposing TR’s

  44. David Capocci, CQA, CSTE Possible Test Requirements... Function Task Transaction 1. Validate that a Rental can occur. 1.4 Open a Rental ticket 1.4.2 Validate that credit card approval is obtained 1.4.2.1 Validate the expiration date is a valid future date 1.4.2.2 Validate the expiration date is not within 1 month of expiring. 1.4.2.3 Validate that the CC# is 12 digits 1.4.2.4 Validate that the $ amount is <= credit balance available 1.4.2.5 Validate that an authorization # is received. Decomposing TR’s

  45. David Capocci, CQA, CSTE Agenda • Defining TR’s: What, Why, Where • Fitting TR’s into the testing picture • What’s within our testing process • Generating TR’s • Organizing & Decomposing TR’s • Test Requirements Hierarchy Samples • Setting the stage for measuring test coverage

  46. David Capocci, CQA, CSTE TRH Samples Let’s look at a few examples of how test requirements can be organized: • Sample 1: Excerpt from a Personal Finance app • Sample 2: actually organizing Function requirements, but good representative of the concept • Sample 3: QBS, from Rational’s sample project (adds types of testing into the hierarchy) • Sample 4: another view of the Personal Finance app • Sample 5: A mainframe batch system

  47. David Capocci, CQA, CSTE Test Coverage Measures • Test Requirements are the “what” of testing & are the basis for establishing the completion of testing • TR’s give us the point of measurement for test coverage • Each TR should receive a Priority, Risk, and Weight • Each TR should be tracked for Verification () and Validation (%) Test Coverage Measures

  48. David Capocci, CQA, CSTE Summary & Recap • Defined: What, Why, Where • Described: How TR’s “fit” into the big picture • Decomposed: Organizing TRs & Generate TR’s into a measurable format • Demonstrated: Sampling some TRH • Determined: The Measurement Connection

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