Check out the test branch in SourceTree. Al ways make sure you are working on test branch.
The developer would then open the project in Eclipse by clicking File ->Open Projects from File System.
In Import source, type in the directory of the source code checked out from BitBucket (or click the Directory button to browse). Check the project folder as shown, and click the Finish button.
The project now is shown in Project Explorer
If there are errors that refer to libraries, add the libraries (checked out from Bitbucket repo) to the build path by select the jar libraries, Control-Click, then select Build Path -> Add to Buid Path