sourceDir[0] = projectDir;
}
VirtualFile ext_src = LocalFileSystem.getInstance().refreshAndFindFileByIoFile(new File(testDir + "/ext_src"));
final ModuleRootManager rootManager = ModuleRootManager.getInstance(myModule);
final ModifiableRootModel rootModel = rootManager.getModifiableModel();
rootModel.clear();
// configure source and output path
final ContentEntry contentEntry = rootModel.addContentEntry(projectDir);
contentEntry.addSourceFolder(sourceDir[0], false);
if (ext_src != null) {
contentEntry.addSourceFolder(ext_src, false);