diff --git a/examples/materials.json b/examples/materials.json
new file mode 100644
index 0000000..6bd17a6
--- /dev/null
+++ b/examples/materials.json
@@ -0,0 +1,20 @@
+{
+	"materials": {
+		"metal": {
+			"reflectivity": 1.0
+		},
+		"plastic": {
+			"reflectivity": 0.5
+		}
+	},
+	"entities": [
+		{
+			"name": "hero",
+			"material": "metal"
+		},
+		{
+			"name": "monster",
+			"material": "plastic"
+		}
+	]
+}
diff --git a/examples/materials.ron b/examples/materials.ron
new file mode 100644
index 0000000..b7d7f4c
--- /dev/null
+++ b/examples/materials.ron
@@ -0,0 +1,20 @@
+Scene( // class name is optional
+	materials: { // this is a map
+		"metal": (
+			reflectivity: 1.0,
+		),
+		"plastic": (
+			reflectivity: 0.5,
+		),
+	},
+	entities: [ // this is an array
+		(
+			name: "hero",
+			material: "metal",
+		),
+		(
+			name: "monster",
+			material: "plastic",
+		),
+	],
+)
diff --git a/src/lib.rs b/src/lib.rs
index c9c34be..bb9ab7b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,7 @@ use clap::{Parser, ValueEnum};
 use serde::de::Deserializer;
 use std::io::{Read, Write};
 
-#[derive(Parser)]
+#[derive(Debug, Parser)]
 #[clap(author, version, about, long_about = None)]
 pub struct Opt {
     /// Input type
diff --git a/tests/integration.rs b/tests/integration.rs
new file mode 100644
index 0000000..a66359d
--- /dev/null
+++ b/tests/integration.rs
@@ -0,0 +1,36 @@
+use tradaf::*;
+
+fn example_to_vec(file: &str) -> Vec<u8> {
+    use std::fs::File;
+    use std::io::prelude::*;
+
+    let mut f = File::open(file).unwrap();
+    let mut buffer = vec![];
+    f.read_to_end(&mut buffer).unwrap();
+    buffer
+}
+
+fn example_to_string(file: &str) -> String {
+    let buffer = example_to_vec(file);
+    String::from_utf8(buffer).unwrap()
+}
+
+#[test]
+fn ron_to_json() {
+    let opt = Opt {
+        input: Input::Ron,
+        output: Output::Json,
+        pretty: true,
+        no_newline: false,
+    };
+
+    let input = example_to_vec("examples/materials.ron");
+
+    let mut output = vec![];
+    transcode(opt, &mut input.as_slice(), &mut output);
+    let out = String::from_utf8(output).unwrap();
+
+    let control = example_to_string("examples/materials.json");
+
+    assert_eq!(control, out);
+}