Add test for SchemaBuilder::override_description. #327

tests/use_type_description.rs

@@ -1,5 +1,6 @@
 use async_graphql::*;
 use async_std::stream::Stream;
+use chrono::{DateTime, Utc};
 
 #[async_std::test]
 pub async fn test_object() {
@@ -98,3 +99,45 @@ pub async fn test_subscription() {
         })
     );
 }
+
+#[async_std::test]
+pub async fn test_override_description() {
+    /// Haha
+    #[derive(SimpleObject)]
+    struct Query {
+        value: i32,
+        value2: DateTime<Utc>,
+    }
+
+    let schema = Schema::build(
+        Query {
+            value: 100,
+            value2: Utc::now(),
+        },
+        EmptyMutation,
+        EmptySubscription,
+    )
+    .override_description::<Query>("Hehe")
+    .override_description::<DateTime<Utc>>("DT")
+    .finish();
+
+    assert_eq!(
+        schema
+            .execute(r#"{ __type(name: "Query") { description } }"#)
+            .await
+            .data,
+        value!({
+            "__type": { "description": "Hehe" }
+        })
+    );
+
+    assert_eq!(
+        schema
+            .execute(r#"{ __type(name: "DateTime") { description } }"#)
+            .await
+            .data,
+        value!({
+            "__type": { "description": "DT" }
+        })
+    );
+}