add simple test

Author: molpopgen

tests/test_tables.rs

@@ -323,7 +323,11 @@ mod test_metadata_round_trips {
                 let row = tables.$adder(&md);
                 match_block_impl!(tables, $table, $adder, row, md);
                 let mut lending_iter = tables.$table().lending_iter();
+                let mut iter = tables.$table().iter();
                 while let Some(row) = lending_iter.next() {
+                    if let Some(row_from_iter) = iter.next() {
+                        assert_eq!(row.id, row_from_iter.id);
+                    }
                     if let Some(metadata) = row.metadata {
                         assert_eq!(MyMetadata::decode(metadata).unwrap(), md);
                     }else {
@@ -342,7 +346,11 @@ mod test_metadata_round_trips {
                 let row =  tables.$adder($($payload ), *, &md);
                 match_block_impl!(tables, $table, $adder, row, md);
                 let mut lending_iter = tables.$table().lending_iter();
+                let mut iter = tables.$table().iter();
                 while let Some(row) = lending_iter.next() {
+                    if let Some(row_from_iter) = iter.next() {
+                        assert_eq!(row.id, row_from_iter.id);
+                    }
                     if let Some(metadata) = row.metadata {
                         assert_eq!(MyMetadata::decode(metadata).unwrap(), md);
                     }else {