Automated Requirements-Based Testing
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1 Automated Requirements-Based Testing Tuesday, October 7 th The MathWorks, Inc. Dr. Marc Segelken Senior Application Engineer
2 Overview Purposes of Testing Test Case Generation Structural Testing vs. Requirements-based Testing Testing Methods Requirements Formalization Using Formalized Requirements Proving Properties Measuring Requirements Coverage Generating Requirements-based Tests Summary 2
3 Testing 1 Design Verification Textual Textual Requirements Requirements Specification Specification Model Testing Verify that design meets requirements Tests Model used for Model used for production production code generation code generation C Source C Source Code Code Object Code Object Code Code Testing Verify that the behavior of source code and object code matches the model 2 Code Verification 3
4 Testing Functional Equivalence between Model and Code Pairwise equality check 4
5 Test Generation for Modules Overview Input Model Coverage metric Test generation Simulink Design Verifier Results Harness model Input test signals Unreachable objects Detailed reports Optional Input Modifiable parameter sets Existing coverage data Decision coverage Condition coverage MC/DC Custom Objectives 5
6 Structural Coverage vs. Requirements Coverage DO-178B approach Find tests for requirements until complete structural coverage (MC/DC) is given Structural coverage criteria itself often considered less relevant Requirements coverage unknown since tests for structural criteria usually do not match requirements But: No metrics for requirements coverage standardized yet 6
7 Map of Testing Methods Degree of automation Test Generation covering structure Metrics Structural Coverage Test Generation covering requirements Metrics Requirements Coverage Formalized Requirements Test generation environment constraint Random Test (Monte Carlo) Abstract checks (limits, invariants) Test Analysis (observer based) Test Design (manual) Regression Tests (expected values) Manual Review (each test run) Relevance for requirements 7
8 Formalizing Requirements Various dedicated languages (most with certain limitations) Textual: temporal logics (CTL,LTL, ) Graphical: timing diagrams, sequence diagrams, General Language: Same as modeling language e.g., Simulink, Stateflow, MATLAB, limited to safety requirements (>99% of all industrial requirements) Simplest Requirement: Never enter failure state. 8
9 Advantages of Formalized Requirements Unambiguous precise definition Automatic decision if a test run was successfull Metrics for requirements coverage Possibility of automatic test generation Possibility to prove correctness 9
10 How to use Formalized Properties 10
11 Model Checking for Modules 1 Design Verification Textual Textual Requirements Requirements Specification Specification Model used for Model used for production production code generation code generation Formal Verification Proving Design Properties Prove that design meets the key functional requirements C Source C Source Code Code Object Code Object Code 2 Code Verification 11
12 Property Proving Inputs Property proving Results Proof satisfied Proof falsified Counterexamples Model harness Detailed reports Optional Assumptions Model parameter ranges/sets 12
13 Formalizing Requirements Using basic primitives Proof Objective (what is to be proven) Proof Assumption (under what environmental restrictions) Or higher level (customer specific) blocks to specify more complex properties 13
14 Proving of Properties Simulink Design Verifier 1 Design Verification Textual Requirements Textual Requirements Specification Specification Model used for production Model used for codeproduction generation code generation C Source Code C Source Code Object Code Object Code Formal Verification Standard Requirements Benefits Quickly find incorrect behavior Certify correct behavior No stronger approval of correctness possible or necessary 2 Code Verification 14
15 Why using formalized requirements for tests, if proving is much stronger? Test cases needed nevertheless for a variety of reasons: Increased confidence in property proving results Helps understanding semantics of formalized requirements Requirements-based tests required If proving is not possible, still metrics available 15
16 Formalized Properties for Testing Input Test generation Simulink Design Verifier Results Harness model Input test signals => Requirements-based tests Test objectives only in here 16
17 Requirements-based Test Generation Simple example: Using customer-specified test objectives for desired scenarios Tests for path coverage for formalized requirements can be generated automatically 17
18 Example Requirement: Iteratively, whenever In5 is true, In6 has to occur within next 8 steps Path coverage of requirement model == requirement coverage => requirements coverage can be measured => requirements-based tests can be generated automatically 18
19 Finding relevant Test Cases no One has thought about Example: Invariant vs. Initial 19
20 Generating longer varying test cases Using unrolled paths for several iterations 20
21 Summary 1 Design Verification Textual Textual Requirements Requirements Modeling Specification Specification Modeling Modeling Model used for Model used for production production code generation code generation Code Generation C Source C Source Code Code Compilation /Linking Formal Verification Formalized Requirements help to solve various problems Possibly serving as test metrics Can be used for automatic test case generation Tests Object Code Object Code 2 Code Verification 21
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