// test translation
Transform3D transform3D = new Transform3D();
transformGroup.getTransform(transform3D);
Vector3d translationVector = new Vector3d();
transform3D.get(translationVector);
TreeBranch treeBranch = mockTree.getBranches().get(nbBranchesFound);
Vector3d expectedTranslationVector = treeBranch.getBranch3D().getTranslationVector();
VectorTestHelper.assertVectorEquals(expectedTranslationVector, translationVector);
// test one branch found
Structure3DHelper.assertExactlyOneGroup(transformGroup);
Group specificGroupForTheBranch = (Group) transformGroup.getChild(0);