How do I run test cases in a list of slightly different jars?
I have a list of jar files containing several different versions of the same system.
I want to execute a set of test cases in each jar file, being able to get the results for each jar (via RunListener or something).
I am a bit confused about the class loading issues that are implied.
How can i do this?
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If you are using ant, the JUnit task takes a classpath.
<target name="test">
<junit ...">
<classpath>
<pathelement path="${test.jar.path}" />
</classpath>
...
</junit>
</target>
You can use the antcall task to call your test object again with a different value for the test.jar.path property.
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If the jars support the same interface, then all you have to do is run each test with several different classes - each time with jars from a different version.
If you are using the Eclipse JUnit integration, simply create N run configurations, in each of which, on the classpath tab, specify the required jars.
If you want to do this programmatically, then I suggest you start with an empty classpath and use the URLClassLoader , giving it a different set of jars each time.
Something like that:
URLClassloader ucl = new URLClassLoader( list of jars from version1 );
TestCase tc = ucl.loadClass("Your Test Case").newInstance();
tc.runTest();
ucl = new URLClassLoader( list of jars from version2 );
TestCase tc = ucl.loadClass("Your Test Case").newInstance();
tc.runTest();
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