Add some initial type integration tests for Postgres

Cargo.toml

@@ -40,6 +40,10 @@ criterion = "0.3.0"
 name = "sql-macro-test"
 required-features = ["postgres", "uuid", "macros"]
 
+[[test]]
+name = "postgres-types"
+required-features = ["postgres"]
+
 [[bench]]
 name = "postgres_protocol"
 required-features = ["postgres", "unstable"]

tests/postgres-types.rs

@@ -0,0 +1,35 @@
+use sqlx::{Connection, Postgres};
+use std::env;
+
+macro_rules! test {
+    ($name:ident: $ty:ty: $($text:literal == $value:expr),+) => {
+        #[async_std::test]
+        async fn $name () -> sqlx::Result<()> {
+            let mut conn =
+                Connection::<Postgres>::open(&env::var("DATABASE_URL").unwrap()).await?;
+
+            $(
+                let row = sqlx::query(&format!("SELECT {} = $1, $1", $text))
+                    .bind($value)
+                    .fetch_one(&mut conn)
+                    .await?;
+
+                assert!(row.get::<bool>(0));
+                assert!($value == row.get::<$ty>(1));
+            )+
+
+            Ok(())
+        }
+    }
+}
+
+test!(postgres_bool: bool: "false::boolean" == false, "true::boolean" == true);
+
+test!(postgres_smallint: i16: "821::smallint" == 821_i16);
+test!(postgres_int: i32: "94101::int" == 94101_i32);
+test!(postgres_bigint: i64: "9358295312::bigint" == 9358295312_i64);
+
+test!(postgres_real: f32: "9419.122::real" == 9419.122_f32);
+test!(postgres_double: f64: "939399419.1225182::double precision" == 939399419.1225182_f64);
+
+test!(postgres_text: String: "'this is foo'" == "this is foo", "''" == "");