Add a dummy library for testing the macro

Cargo.lock

@@ -2,6 +2,14 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "gain"
+version = "0.1.0"
+dependencies = [
+ "nih_plug",
+ "nih_plug_derive",
+]
+
 [[package]]
 name = "nih_plug"
 version = "0.1.0"

Cargo.toml

@@ -1,2 +1,2 @@
 [workspace]
-members = ["nih_plug", "nih_plug_derive"]
+members = ["nih_plug", "nih_plug_derive", "plugins/gain"]

plugins/gain/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "gain"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+
+[dependencies.nih_plug]
+path = "../../nih_plug"
+
+[dependencies.nih_plug_derive]
+path = "../../nih_plug_derive"

plugins/gain/src/lib.rs

@@ -0,0 +1,33 @@
+use nih_plug::params::{FloatParam, IntParam, Params, Range};
+use nih_plug_derive::Params;
+
+#[derive(Params)]
+struct FooParams {
+    #[id("pain")]
+    pub pain: FloatParam,
+    #[id("pain_stages")]
+    pub pain_stages: IntParam,
+
+    #[id("identifiers_are_stable")]
+    pub but_field_names_can_change: FloatParam,
+}
+
+impl Default for FooParams {
+    fn default() -> Self {
+        Self {
+            pain: FloatParam {
+                value: 69.0,
+                range: Range::Linear {
+                    min: -420.0,
+                    max: 420.0,
+                },
+                name: "Pain",
+                unit: " Hertz",
+                value_to_string: None,
+                string_to_value: None,
+            },
+            pain_stages: todo!(),
+            but_field_names_can_change: todo!(),
+        }
+    }
+}