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Software testing of real-time systems

By Sophie Hutchinson (sxh07u). Software testing of real-time systems . Contents. Introduction to Real-time systems Two main types of system Testing real-time software Difficulties with testing such software. Introduction. What is a Real-time System?

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Software testing of real-time systems

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  1. By Sophie Hutchinson (sxh07u) Software testing of real-time systems

  2. Contents Introduction to Real-time systems Two main types of system Testing real-time software Difficulties with testing such software

  3. Introduction • What is a Real-time System? • A real time system is one that “is subject to real time constraints” meaning that operations must produce a response within a given time. • Examples include: • Air traffic control systems • Medical monitoring • Weapons delivery systems • Space navigation and guidance

  4. Types of Real-time System • There are two main types of real-time systems: • Hard real-time system – Requires that operations must be completed within their deadline e.g. systems in space shuttles, fight control. • Soft real-time system – Although it is emphasised that deadlines are important they are not as strict as in hard real-time systems.

  5. Introduction to testing… • How do we test a real-time software? • There isn’t one single method for testing real-time software. • In order to test such software need to use several methods and strategies such as: • White box testing • Black box testing • Sequence testing • Integration testing

  6. How do we test software in real-time systems? • A strategy for testing real-time software should include: • Low-level tests – single lines of code • High-level tests – methods and functions • In order to test such software one technique might be to generate and test sequences by applying time constraints in which they must be completed.

  7. The 3-stage approach to testing real time software • 1. Identification of tasks • Output Testing • Performance Testing • 2. Incorporation of tasks • Output Testing • Performance Testing in a real environment • 3. Integration Testing

  8. Difficulties with testing Real-time software • It is difficult to test a system that is running in real time due to factors such as: • Time constraints • Conventional methods are not applicable for real-time software • This can lead to… • Unpredictable outcomes

  9. Summary • A real-time system is subject to time constraints • Two main types of real-time system • No single way of testing this software • Difficulties with testing such software

  10. Any questions?

  11. References • http://msdn.microsoft.com/en-us/library/aa459157.aspx • http://en.wikipedia.org/wiki/Real-time_computing • G53SRP module page • http://www.ndt.net/article/wcndt00/papers/idn235/idn235.htm • http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=139423

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