diff --git a/nih_plug_derive/tests/persist.rs b/nih_plug_derive/tests/persist.rs
new file mode 100644
index 00000000..b5a595c2
--- /dev/null
+++ b/nih_plug_derive/tests/persist.rs
@@ -0,0 +1,138 @@
+use std::collections::BTreeMap;
+use std::sync::Mutex;
+
+use nih_plug::prelude::*;
+
+#[derive(Params, Default)]
+struct WrapperParams {
+    #[nested(id_prefix = "foo")]
+    pub inner: InnerParams,
+}
+
+#[derive(Params, Default)]
+struct ArrayWrapperParams {
+    #[nested(array)]
+    pub inners: [InnerParams; 3],
+}
+
+#[derive(Default)]
+struct InnerParams {
+    /// The value `deserialize()` has been called with so we can check that the prefix has been
+    /// stripped correctly.
+    pub deserialize_called_with: Mutex<Option<BTreeMap<String, String>>>,
+}
+
+unsafe impl Params for InnerParams {
+    fn param_map(&self) -> Vec<(String, ParamPtr, String)> {
+        Vec::new()
+    }
+
+    fn serialize_fields(&self) -> BTreeMap<String, String> {
+        // When nested in another struct, the ID prefix will be added to `bar`
+        let mut data = BTreeMap::new();
+        data.insert(String::from("bar"), String::from("baz"));
+
+        data
+    }
+
+    fn deserialize_fields(&self, serialized: &BTreeMap<String, String>) {
+        *self.deserialize_called_with.lock().unwrap() = Some(serialized.clone());
+    }
+}
+
+mod persist {
+    mod nested_prefix {
+
+        use super::super::*;
+
+        #[test]
+        fn serialize() {
+            let params = WrapperParams::default();
+
+            // This should have had a prefix added to the serialized value
+            let serialized = params.serialize_fields();
+            assert_eq!(serialized.len(), 1);
+            assert_eq!(serialized["foo_bar"], "baz");
+        }
+
+        #[test]
+        fn deserialize() {
+            let mut serialized = BTreeMap::new();
+            serialized.insert(String::from("foo_bar"), String::from("aaa"));
+
+            let params = WrapperParams::default();
+            params.deserialize_fields(&serialized);
+
+            // This contains the values passed to the inner struct's deserialize function
+            let deserialized = params
+                .inner
+                .deserialize_called_with
+                .lock()
+                .unwrap()
+                .take()
+                .unwrap();
+            assert_eq!(deserialized.len(), 1);
+            assert_eq!(deserialized["bar"], "aaa");
+        }
+
+        #[test]
+        fn deserialize_mismatching_prefix() {
+            let mut serialized = BTreeMap::new();
+            serialized.insert(String::from("foo_bar"), String::from("aaa"));
+            serialized.insert(
+                String::from("something"),
+                String::from("this should not be there"),
+            );
+
+            let params = WrapperParams::default();
+            params.deserialize_fields(&serialized);
+
+            // The `something` key should not be passed to the child struct
+            let deserialized = params
+                .inner
+                .deserialize_called_with
+                .lock()
+                .unwrap()
+                .take()
+                .unwrap();
+            assert_eq!(deserialized.len(), 1);
+            assert_eq!(deserialized["bar"], "aaa");
+        }
+    }
+
+    mod array_suffix {
+        use super::super::*;
+
+        #[test]
+        fn serialize() {
+            let params = ArrayWrapperParams::default();
+
+            let serialized = params.serialize_fields();
+            assert_eq!(serialized.len(), 3);
+            assert_eq!(serialized["bar_1"], "baz");
+            assert_eq!(serialized["bar_2"], "baz");
+            assert_eq!(serialized["bar_2"], "baz");
+        }
+
+        #[test]
+        fn deserialize() {
+            let mut serialized = BTreeMap::new();
+            serialized.insert(String::from("bar_1"), String::from("aaa"));
+            serialized.insert(String::from("bar_2"), String::from("bbb"));
+            serialized.insert(String::from("bar_3"), String::from("ccc"));
+
+            let params = ArrayWrapperParams::default();
+            params.deserialize_fields(&serialized);
+            for (inner, expected_value) in params.inners.into_iter().zip(["aaa", "bbb", "ccc"]) {
+                let deserialized = inner
+                    .deserialize_called_with
+                    .lock()
+                    .unwrap()
+                    .take()
+                    .unwrap();
+                assert_eq!(deserialized.len(), 1);
+                assert_eq!(deserialized["bar"], expected_value);
+            }
+        }
+    }
+}