postgres: Create postgres-types for PgInterval

tests/postgres-types.rs

@@ -346,6 +346,40 @@ mod time_tests {
     ));
 }
 
+mod interval {
+    use super::*;
+    use sqlx::postgres::types::PgInterval;
+
+    test_prepared_type!(interval(
+        Postgres,
+        PgInterval,
+        "INTERVAL '1h'"
+            == PgInterval {
+                months: 0,
+                days: 0,
+                microseconds: 3_600_000_000
+            },
+        "INTERVAL '-1 hours'"
+            == PgInterval {
+                months: 0,
+                days: 0,
+                microseconds: -3_600_000_000
+            },
+        "INTERVAL '3 months 12 days 1h 15 minutes 10 second '"
+            == PgInterval {
+                months: 3,
+                days: 12,
+                microseconds: (3_600 + 15 * 60 + 10) * 1_000_000
+            },
+        "INTERVAL '03:10:20.116100'"
+            == PgInterval {
+                months: 0,
+                days: 0,
+                microseconds: (3 * 3_600 + 10 * 60 + 20) * 1_000_000 + 116100
+            },
+    ));
+}
+
 // This is trying to break my complete lack of understanding of null bitmaps for array/record
 // decoding. The docs in pg are either wrong or I'm reading the wrong docs.
 test_type!(lots_of_nulls_vec(Postgres, Vec<Option<bool>>,