Conformance Testing of MOST based Applications Towards Effective System Testing André Baresel, Michael Schmidt - Daimler. Chrysler AG Contact: michael. a. schmidt@daimlerchrysler. com
Overview on the Talk n Telematics Application: The System Architecture n Specifying Functional Behaviour n Graphical Test Specification in Practice n Hardware in the Loop: Integration of Device Emulation n Using Graphical Logging: the importance of message tracing n Other Application Fields 2
Application Spec Test Devel. Test Exec Logging Other Appl Telematics Application From Users Point of View n Audio (CD / Radio) n Telephone n Navigation n Video n Speech recognition n Short messaging (SMS) n User interface for body electronic 3
Application Spec Test Devel. Test Exec Logging Other Appl Telematics Application Architecture of Telematics Application n Network of embedded devices n Bus system: MOST, CAN Most Bus n Applications implemented by many devices n Logical separation of behaviour into Function. Blocks 4
Application Spec Test Devel. Test Exec Logging Other Appl Specifying Functional Behaviour An Example of one Telematics Application Show Tuning Info Audio Application Press Button, Devices interacting * Audio Gateway * Head Unit * Microphone * CD Changer Manage Audio Channels „Switch from Tape to CD“ Fade Volume n 15 messages in this use case n interactions with other events like mobile phone Start Playing CD Notify CD Position 5
Application Spec Test Devel. Test Exec Logging Other Appl Test Case Design & Execution n Specification-based tests 250+ complex MSCs n Each MSC describes a single scenario n Specific Test Data has to be selected n Parallelism described by textual documentation n Ideas for using State Charts textual 6
Application Spec Test Devel. Test Exec Logging Other Appl Graphical Test Specification In Practice n Test Case Design on System Level n Components are Black Boxes n Data Encodings based on XML-Spec n Timing of Messages n Variation in Message Orderings Open Issue: “Different Ports for System Components” vs. “Modeling of parallel Components” 7
Application Spec Test Devel. Test Exec Logging Other Appl Test Case Design & Execution The Vision: Towards an Automated Test Environment MSC & State based Specifications Scripts Behavioral model Test execution Classification-Tree Method Systematic Definition of Test Data 8
Application Spec Test Devel. Test Exec Logging Other Appl Test System Hardware Environment n SUT: Interplay of MOST devices n Test Hardware allows Stimulation n Capturing of communication between all devices 9
Application Spec Test Devel. Test Exec Logging Other Appl Test System MOST/CAN Message Encoder TTCN-3 Execution Environment Remote Test Runtime Interface MOST Interface virtual devices stimulate / simulate MOST Net. Services CAN Interface verify & simulate CAN Driver Optolyzer Interface verify MOST Optolyzer Control Or PCI Karte Optolyzer CAN Card Optolyzer Test Runtime Interface MOST/CAN Message Definition Hardware Interface to Access SUT TTCN Test Cases TTCN-3 Software Architecture 10
Application Spec Test Devel. Test Exec Logging Other Appl Hardware in the Loop Integration of Device Emulation n Test Scripts running with virtual & existing Devices n TRI Implementation detects whether or not a Device exists n Message Verification or Stimulation* is used MOST CAN Virtual Key voice Virtual CD Changer CAN bus 11
Application Spec Test Devel. Test Exec Logging Other Appl Using Graphical Logging The Importance of Message Tracing Goal: Visualization of Message Passing for Analysis and Documentation n Telematics Testers work with Logs of different Sources, Filtering the important information is essential n Documentation and Error Reporting Solution: n Graphical Logger Prototype using Logger-Interface n Allows Navigation and Filtering 12
Application Spec Test Devel. Test Exec Logging Other Appl Conclusion n TTCN-3 has been successfully used to test Telematic applications n First steps toward an efficient test development environment n The usage of GFN for specifying tests has been approved n The TRI allows us to create all scenarios of Hardware in a Loop (HIL) n It was easy to add new Hardware Interfaces n A prototype of a graphical logger has shown the advantages of the solution 13
Application Spec Test Devel. Test Exec Logging Other Appl Future Extensions… Using TTNC-3 to Execute State Based Test Models n Wait for Events on Continue Signals n Describe Signal Generation Other Aspects n Integration with Test Management Tools n Roundtrip Testing: From Logging to Test Cases 14
Application Spec Test Devel. Test Exec Logging Other Application Fields for TTCN-3 In the Automotive Context Real Time Environments n motor controller (petrol & diesel engine) n electronic gear shifting, car body control (pneumatic shock absorption) n environmental electronics (e. g. window heating, air conditioning unit) Characterisation of Applications n many components interact n over different networks (most, can, bluetooth) n overlapping functionality n Real time constrains to be validated 15
Conformance Testing of MOST based Applications Towards Effective System Testing André Baresel, Michael Schmidt - Daimler. Chrysler AG Contact: michael. a. schmidt@daimlerchrysler. com 16
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