diff --git a/Cargo.lock b/Cargo.lock
index 91e72450a..a76ad8709 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -911,6 +911,7 @@ dependencies = [
  "rayon",
  "serde",
  "serde_json",
+ "serde_test",
  "stderrlog",
  "structopt",
  "tempfile",
@@ -2079,6 +2080,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_test"
+version = "1.0.125"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4bb5fef7eaf5a97917567183607ac4224c5b451c15023930f23b937cce879fe"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_urlencoded"
 version = "0.6.1"
diff --git a/http-ui/Cargo.toml b/http-ui/Cargo.toml
index 02a799091..748564c03 100644
--- a/http-ui/Cargo.toml
+++ b/http-ui/Cargo.toml
@@ -37,3 +37,6 @@ fst = "0.4.5"
 
 # Temporary fix for bitvec, remove once fixed. (https://github.com/bitvecto-rs/bitvec/issues/105)
 funty = "=1.1"
+
+[dev-dependencies]
+serde_test = "1.0.125"
diff --git a/http-ui/src/main.rs b/http-ui/src/main.rs
index 6e9a07855..1b77e443e 100644
--- a/http-ui/src/main.rs
+++ b/http-ui/src/main.rs
@@ -242,7 +242,7 @@ enum UpdateMetaProgress {
     },
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 #[serde(deny_unknown_fields)]
 #[serde(rename_all = "camelCase")]
 struct Settings {
@@ -993,3 +993,62 @@ async fn main() -> anyhow::Result<()> {
     let addr = SocketAddr::from_str(&opt.http_listen_addr)?;
     Ok(warp::serve(routes).run(addr).await)
 }
+
+#[cfg(test)]
+mod tests {
+    use serde_test::{assert_de_tokens, assert_ser_tokens, Token};
+
+    use milli::update::Setting;
+
+    use crate::Settings;
+
+    #[test]
+    fn serialize_settings() {
+        let settings = Settings {
+            displayed_attributes: Setting::Set(vec!["name".to_string()]),
+            searchable_attributes: Setting::Reset,
+            faceted_attributes: Setting::NotSet,
+            criteria: Setting::NotSet,
+            stop_words: Default::default(),
+        };
+
+        assert_ser_tokens(&settings, &[
+            Token::Struct { name: "Settings", len: 3 },
+            Token::Str("displayedAttributes"),
+            Token::Some,
+            Token::Seq { len: Some(1) },
+            Token::Str("name"),
+            Token::SeqEnd,
+            Token::Str("searchableAttributes"),
+            Token::None,
+            Token::Str("facetedAttributes"),
+            Token::None,
+            Token::StructEnd,
+        ]);
+    }
+
+    #[test]
+    fn deserialize_settings() {
+        let settings = Settings {
+            displayed_attributes: Setting::Set(vec!["name".to_string()]),
+            searchable_attributes: Setting::Reset,
+            faceted_attributes: Setting::Reset,
+            criteria: Setting::NotSet,
+            stop_words: Setting::NotSet,
+        };
+
+        assert_de_tokens(&settings, &[
+            Token::Struct { name: "Settings", len: 3 },
+            Token::Str("displayedAttributes"),
+            Token::Some,
+            Token::Seq { len: Some(1) },
+            Token::Str("name"),
+            Token::SeqEnd,
+            Token::Str("searchableAttributes"),
+            Token::None,
+            Token::Str("facetedAttributes"),
+            Token::None,
+            Token::StructEnd,
+        ]);
+    }
+}
diff --git a/milli/src/update/settings.rs b/milli/src/update/settings.rs
index f73d0f4d2..5ad942ad6 100644
--- a/milli/src/update/settings.rs
+++ b/milli/src/update/settings.rs
@@ -14,11 +14,11 @@ use crate::facet::FacetType;
 use crate::update::{ClearDocuments, IndexDocuments, UpdateIndexingStep};
 use crate::update::index_documents::{IndexDocumentsMethod, Transform};
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub enum Setting<T> {
     Set(T),
-    NotSet,
     Reset,
+    NotSet,
 }
 
 impl<T> Default for Setting<T> {