Android Testing: Instrumentation run failed due to 'java.lang.ClassNotFoundException'

Question

I have 3 test classes for a particular package from my main application. My first test class is running just fine, the other 2 aren't.

When I try to run those 2 tests, I get the following error:

Instrumentation run failed due to 'java.lang.ClassNotFoundException'

I already verified:

• if the build path was properly configured,
• if the target package is correct,
• if I had problems with importing jUnit.

Any guess about what the problem is?

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Solution:

I changed the version of jUnit I was using and the tests perform as they should.

Answer 1

You need to add JUnit library to your package as following:

On Eclipse, right click on your test project, choose Properties --> Java Build Path, on Order and Export tab, please check on JUnit 4 and click OK.

After that, clean or rebuild your test project and run.