feat(storage): add revision number to documents

ref #13

pkg/storage/testsuite/document_store_ops.go

@@ -185,8 +185,13 @@ var documentStoreOpsTestCases = []documentStoreOpsTestCase{
 				return errors.Errorf("upsertedDoc[\"attr1\"]: expected '%v', got '%v'", e, g)
 			}
 
+			upsertedDocRevision, _ := upsertedDoc.Revision()
+			if e, g := 0, upsertedDocRevision; e != g {
+				return errors.Errorf("upsertedDoc.Revision(): expected '%v', got '%v'", e, g)
+			}
+
 			// Check that document does not have unexpected properties
-			if e, g := 4, len(upsertedDoc); e != g {
+			if e, g := 5, len(upsertedDoc); e != g {
 				return errors.Errorf("len(upsertedDoc): expected '%v', got '%v'", e, g)
 			}
 
@@ -217,6 +222,11 @@ var documentStoreOpsTestCases = []documentStoreOpsTestCase{
 				return errors.New("upsertedDoc2.UpdatedAt() should have been different than upsertedDoc.UpdatedAt()")
 			}
 
+			upsertedDoc2Revision, _ := upsertedDoc2.Revision()
+			if e, g := 1, upsertedDoc2Revision; e != g {
+				return errors.Errorf("upsertedDoc.Revision(): expected '%v', got '%v'", e, g)
+			}
+
 			// Verify that there is no additional created document in the collection
 
 			results, err := store.Query(ctx, collection, nil)
@@ -228,6 +238,11 @@ var documentStoreOpsTestCases = []documentStoreOpsTestCase{
 				return errors.Errorf("len(results): expected '%v', got '%v'", e, g)
 			}
 
+			firstResultRevision, _ := results[0].Revision()
+			if e, g := 1, firstResultRevision; e != g {
+				return errors.Errorf("results[0].Revision(): expected '%v', got '%v'", e, g)
+			}
+
 			return nil
 		},
 	},
@@ -437,7 +452,6 @@ func testDocumentStoreOps(ctx context.Context, t *testing.T, store storage.Docum
 	for _, tc := range documentStoreOpsTestCases {
 		func(tc documentStoreOpsTestCase) {
 			t.Run(tc.Name, func(t *testing.T) {
-				t.Parallel()
 				if err := tc.Run(ctx, store); err != nil {
 					t.Errorf("%+v", errors.WithStack(err))
 				}