Test adding and removing annotator from projects part way & check utility for repeat annotation

[twinkarma]

Resolves #322, resolves #323

I've downloaded a db backup from the production site and tried to reproduce the error from #322 and #323 but can't seem to reproduced it. I've contacted Mughda about this and we may be able to get the annotator to check if they're still getting the same errors.

Changes

• Added backend tests for:
  • Removing an annotator from a project they've partially annotated in and adding them to another one
  • Rejecting an annotator from a project they've partially annotated in and adding them to another one
• Added CLI command check_util repeat_annotation to check whether there are any repeat annotations, i.e. a document has multiple annotations from the same annotator (status COMPLETED, PENDING or REJECTED only)
• When checking the test score, only completed annotation should be checked

[twinkarma]

Failing test not related to this PR, will be resolved in #372

[twinkarma]

I'm now getting a different error, will be looking into this:

=================================== FAILURES ===================================
______________ TestProjectModel.test_get_annotator_document_score ______________

self = <backend.tests.test_models.TestProjectModel testMethod=test_get_annotator_document_score>

    def test_get_annotator_document_score(self):
        annotator = self.annotators[0]
        # No annotations == 0
        self.assertEqual(0, self.project.get_annotator_document_score(annotator, DocumentType.TEST))
    
        incorrect_data = {
            "label1": "Incorrect",
            "label2": "Incorrect"
        }
    
        # All incorrect
        for doc in self.test_docs:
            anno = Annotation.objects.create(user=annotator, document=doc)
            anno.data = incorrect_data
    
        self.assertEqual(0, self.project.get_annotator_document_score(annotator, DocumentType.TEST))
    
        # All correct
        annotator2 = self.annotators[1]
        for doc in self.test_docs:
            correct_annotation_data = {
                "label1": doc.data["gold"]["label1"]["value"],
                "label2": doc.data["gold"]["label2"]["value"],
            }
            anno = Annotation.objects.create(user=annotator2, document=doc)
            anno.data = correct_annotation_data
    
>       self.assertEqual(self.num_test_docs, self.project.get_annotator_document_score(annotator2, DocumentType.TEST))
E       AssertionError: 7 != 0

backend/tests/test_models.py:696: AssertionError

[twinkarma]

The issue should have been fixed with previous commits, this is then just an extra tests to check for the exact conditions described in the issues.

The current failing test is due to be fixed in #372