diff --git a/tests/cli.rs b/tests/cli.rs
index f56ec50..a4e3af6 100644
--- a/tests/cli.rs
+++ b/tests/cli.rs
@@ -29,5 +29,13 @@ fn files() -> io::Result<()> {
     assert_eq!(tmp_decrypted.read(&mut buff)?, PLAINTEXT.len());
     assert_eq!(buff, PLAINTEXT);
 
+    Ok(())
+}
+
+#[test]
+fn argon2_params() -> io::Result<()> {
+    Command::cargo_bin("doby").unwrap().arg("-i").arg("0").assert().stderr("Invalid argon2 params: time cost is too small\n");
+    Command::cargo_bin("doby").unwrap().arg("-m").arg("0").assert().stderr("Invalid argon2 params: memory cost is too small\n");
+    Command::cargo_bin("doby").unwrap().arg("-t").arg("0").assert().stderr("Invalid argon2 params: too few lanes\n");
     Ok(())
 }
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