Software Engineering Large Practical Debugging and Testing Android - - PowerPoint PPT Presentation

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software engineering large practical debugging and

Software Engineering Large Practical Debugging and Testing Android - - PowerPoint PPT Presentation

Jan 30, 2024 326 likes •642 views

Software Engineering Large Practical Debugging and Testing Android apps Stephen Gilmore School of Informatics, University of Edinburgh November 13th, 2013 Stephen Gilmore Software Engineering Large Practical News This is the last SELP

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Software Engineering Large Practical Debugging and Testing Android apps

Stephen Gilmore

School of Informatics, University of Edinburgh

November 13th, 2013

Stephen Gilmore Software Engineering Large Practical

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News

◮ This is the last SELP lecture.

Stephen Gilmore Software Engineering Large Practical

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Debugging Android Apps

In this lecture we consider debugging and testing our Android apps, using the Android debugger and the Android Robotium unit testing suite. We follow an example due to Lars Vogel, available at http://www.vogella.com/articles/AndroidDebugging/article.html

Stephen Gilmore Software Engineering Large Practical

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The problem: our app should display a list of countries, but it doesn’t

Stephen Gilmore Software Engineering Large Practical

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Getting started: Choose “Debug As”

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Debug configurations

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Switch to the “Debug” perspective to see new views such as “Variables” and “Breakpoints”

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Stopping at a breakpoint in the onCreate method

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Assigning a value to the list of countries

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Inspecting the value of the countries variable: an array of empty strings [””, ””, ””, ””, ””, ..., ””]

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Problem identified: Restart the debugging session

Stephen Gilmore Software Engineering Large Practical

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Entering the getCountries method

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Continue executing, looking for updates to countries

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Continue execution

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A simple logic error is discovered: we want the country name if it is not empty

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We are not able to swap in the new version of the code

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We can terminate and relaunch this debugging session

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Success: a list of countries is displayed

Stephen Gilmore Software Engineering Large Practical

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Software testing

A test framework called Robotium is available for testing Android

applications. Using Robotium we can automate tests of Android

apps, and collect statistics on which tests passed and which tests failed, using the JUnit test framework.

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Import Robotium and make an instance of Solo

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Write a void method whose name begins with “test”

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Run as an Android JUnit test

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The emulator appears

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The app under test launches

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Values are entered in the fields

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These values have been entered programmatically

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The button click also is performed for us

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All tests passed (there was only one)

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If some failed, we can see which

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Software testing

A testing framework such as Robotium allows us to formally document a series of tests which we expect our app to pass. These are embedded in the code of the test harness. After every change to our code we can re-run the test harness and check that all tests still pass. Automating testing in this way can turn a boring manual task which is a chore to do into a simple automatic task which is easy to re-run and operates entirely without human intervention.

Stephen Gilmore Software Engineering Large Practical