Increase test coverage

Author: benmwebb

test/input/missing_struct_ref.cif

@@ -38,6 +38,7 @@ _struct_ref.pdbx_align_begin
 _struct_ref.pdbx_seq_one_letter_code
 _struct_ref.details
 1 1 UNP Q90VU7_HV1 Q90VU7 26 . 'Protein NEF Human immunodeficiency virus type 1 (HIV-1)'
+2 1 PDB 1abc 1abc 1 . 'PDB sequence'
 #
 loop_
 _struct_ref_seq.align_id

test/test_reference.py

@@ -138,6 +138,13 @@ def test_uniprot_sequence_add_missing_sequence(self):
             details='foo')
         self._mocked_uniprot_urlopen('P52891.fasta', r.add_missing_sequence)
         self.assertEqual(r.details, 'foo')
+        # If sequence already present, should not be overwritten
+        r = ihm.reference.UniProtSequence(
+            db_code='NUP84_YEAST', accession='testacc', sequence='MEL',
+            details='foo')
+        self._mocked_uniprot_urlopen('P52891.fasta', r.add_missing_sequence)
+        self.assertEqual(r.sequence, 'MEL')
+        self.assertEqual(r.details, 'foo')
 
 
 if __name__ == '__main__':