diff --git a/src/main.rs b/src/main.rs
index c694766..1f56fa6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,15 @@
 use std::io::{self, prelude::*};
 
 fn main() -> Result<(), io::Error> {
+    // TODO: check if stdin is empty and show usage
     let mut tty = std::fs::File::options()
         .write(true)
         .read(false)
-        .open("/dev/tty")?;
-    io::copy(&mut io::stdin(), &mut tty)?;
-    tty.flush()?;
-    io::copy(&mut io::stdin(), &mut io::stdout())?;
+        .open("/dev/tty")
+        .inspect_err(|err| eprintln!("{err}"))?;
+    // FIXME: only works with cargo run?
+    io::copy(&mut io::stdin(), &mut tty).inspect_err(|err| eprintln!("{err}"))?;
+    tty.flush().inspect_err(|err| eprintln!("{err}"))?;
+    io::copy(&mut io::stdin(), &mut io::stdout()).inspect_err(|err| eprintln!("{err}"))?;
     Ok(())
 }
diff --git a/tests/cli.rs b/tests/cli.rs
new file mode 100644
index 0000000..6671249
--- /dev/null
+++ b/tests/cli.rs
@@ -0,0 +1,4 @@
+#[test]
+fn pipe_echo_cat() {
+    todo!()
+}