diff --git a/.changeset/short-lamps-kiss.md b/.changeset/short-lamps-kiss.md
new file mode 100644
index 0000000..a845151
--- /dev/null
+++ b/.changeset/short-lamps-kiss.md
@@ -0,0 +1,2 @@
+---
+---
diff --git a/src/command.rs b/src/command.rs
index 654ac65..7a889da 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -14,6 +14,32 @@ pub fn define_command(options: Command) -> Command {
   options
 }
 
+#[cfg(test)]
+mod tests {
+  use crate::command::{define_command, Command};
+  use crate::types::CommandMeta;
+
+  #[test]
+  fn test_define_command() {
+    let meta = CommandMeta {
+      name: Some("test".to_string()),
+      version: Some("1.0.0".to_string()),
+      about: Some("test case".to_string()),
+      styled: Some(false),
+    };
+    let cmd = Command {
+      meta: meta.clone(),
+      options: Default::default(),
+      callback: None,
+      subcommands: None,
+    };
+
+    let defined_cmd = define_command(cmd);
+
+    assert_eq!(defined_cmd.meta, meta);
+  }
+}
+
 /// Run command
 ///
 /// **NOTE**: If the given `args` is empty, it will use `process.argv` instead.
diff --git a/src/types.rs b/src/types.rs
index 25c354a..f283c0d 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -23,7 +23,7 @@ pub struct Context {
 
 /// Command metadata
 #[napi(object)]
-#[derive(Clone)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct CommandMeta {
   /// Command name
   ///
@@ -183,7 +183,7 @@ pub struct CommandOption {
 pub struct Command {
   pub meta: CommandMeta,
   pub options: HashMap<String, CommandOption>,
-  #[napi(ts_type = "(ctx: Context) => void")]
+  #[napi(ts_type = "(ctx: Context) => void ")]
   pub callback: Option<JsFunction>,
   pub subcommands: Option<HashMap<String, Command>>,
 }