Revert "django_spanner: skip 57 expressions_case tests that assume se…

…rial pk"

This reverts commit b431999.

The tests have been edited to remove the serial pk assumption.

fixes #353

django_spanner/features.py

@@ -77,63 +77,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         'aggregation_regress.tests.AggregationTests.test_ticket_11293',
         'defer_regress.tests.DeferRegressionTest.test_ticket_23270',
         'distinct_on_fields.tests.DistinctOnTests.test_basic_distinct_on',
-        'expressions_case.tests.CaseDocumentationExamples.test_conditional_update_example',
-        'expressions_case.tests.CaseDocumentationExamples.test_simple_example',
-        'expressions_case.tests.CaseExpressionTests.test_annotate',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_exclude',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_aggregation_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_aggregation_in_predicate',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_aggregation_in_value',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_annotation_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_annotation_in_predicate',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_annotation_in_value',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_expression_as_condition',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_expression_as_value',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_in_clause',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_join_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_join_in_predicate',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_with_join_in_value',
-        'expressions_case.tests.CaseExpressionTests.test_annotate_without_default',
-        'expressions_case.tests.CaseExpressionTests.test_combined_expression',
-        'expressions_case.tests.CaseExpressionTests.test_combined_q_object',
-        'expressions_case.tests.CaseExpressionTests.test_filter',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_aggregation_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_aggregation_in_predicate',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_aggregation_in_value',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_annotation_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_annotation_in_predicate',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_expression_as_condition',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_expression_as_value',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_join_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_filter_with_join_in_predicate',
-        'expressions_case.tests.CaseExpressionTests.test_filter_without_default',
-        'expressions_case.tests.CaseExpressionTests.test_in_subquery',
-        'expressions_case.tests.CaseExpressionTests.test_lookup_different_fields',
-        'expressions_case.tests.CaseExpressionTests.test_lookup_in_condition',
-        'expressions_case.tests.CaseExpressionTests.test_update',
-        'expressions_case.tests.CaseExpressionTests.test_update_big_integer',
-        'expressions_case.tests.CaseExpressionTests.test_update_decimal',
-        'expressions_case.tests.CaseExpressionTests.test_update_duration',
-        'expressions_case.tests.CaseExpressionTests.test_update_email',
-        'expressions_case.tests.CaseExpressionTests.test_update_file',
-        'expressions_case.tests.CaseExpressionTests.test_update_file_path',
-        'expressions_case.tests.CaseExpressionTests.test_update_fk',
-        'expressions_case.tests.CaseExpressionTests.test_update_float',
-        'expressions_case.tests.CaseExpressionTests.test_update_generic_ip_address',
-        'expressions_case.tests.CaseExpressionTests.test_update_image',
-        'expressions_case.tests.CaseExpressionTests.test_update_null_boolean',
-        'expressions_case.tests.CaseExpressionTests.test_update_null_boolean_old',
-        'expressions_case.tests.CaseExpressionTests.test_update_positive_integer',
-        'expressions_case.tests.CaseExpressionTests.test_update_positive_small_integer',
-        'expressions_case.tests.CaseExpressionTests.test_update_slug',
-        'expressions_case.tests.CaseExpressionTests.test_update_small_integer',
-        'expressions_case.tests.CaseExpressionTests.test_update_text',
-        'expressions_case.tests.CaseExpressionTests.test_update_time',
-        'expressions_case.tests.CaseExpressionTests.test_update_url',
-        'expressions_case.tests.CaseExpressionTests.test_update_uuid',
-        'expressions_case.tests.CaseExpressionTests.test_update_with_expression_as_condition',
-        'expressions_case.tests.CaseExpressionTests.test_update_with_expression_as_value',
-        'expressions_case.tests.CaseExpressionTests.test_update_without_default',
         'generic_relations_regress.tests.GenericRelationTests.test_annotate',
         'get_earliest_or_latest.tests.TestFirstLast',
         'known_related_objects.tests.ExistingRelatedInstancesTests.test_reverse_one_to_one_multi_prefetch_related',