add test set/reset distinct attribute

meilisearch-http/tests/settings/distinct.rs

@@ -0,0 +1,23 @@
+use crate::common::Server;
+use serde_json::{json, Value};
+
+#[actix_rt::test]
+async fn set_and_reset_distinct_attribute() {
+    let server = Server::new().await;
+    let index = server.index("test");
+
+    let (_response, _code) = index.update_settings(json!({ "distinctAttribute": "test"})).await;
+    index.wait_update_id(0).await;
+
+    let (response, _) = index.settings().await;
+
+    assert_eq!(response["distinctAttribute"], "test");
+
+    index.update_settings(json!({ "distinctAttribute": Value::Null })).await;
+
+    index.wait_update_id(1).await;
+
+    let (response, _) = index.settings().await;
+
+    assert_eq!(response["distinctAttribute"], Value::Null);
+}

meilisearch-http/tests/settings/get_settings.rs

@@ -20,6 +20,7 @@ async fn get_settings() {
     assert_eq!(settings["displayedAttributes"], json!(["*"]));
     assert_eq!(settings["searchableAttributes"], json!(["*"]));
     assert_eq!(settings["attributesForFaceting"], json!({}));
+    assert_eq!(settings["distinctAttribute"], serde_json::Value::Null);
     assert_eq!(
         settings["rankingRules"],
         json!([

meilisearch-http/tests/settings/mod.rs

@@ -1 +1,2 @@
 mod get_settings;
+mod distinct;