diff --git a/src/cmp.rs b/src/cmp.rs
index c3cd903..3bf52ef 100644
--- a/src/cmp.rs
+++ b/src/cmp.rs
@@ -6,6 +6,7 @@ use std::io::{Cursor, Seek, SeekFrom};
 use binrw::BinRead;
 use binrw::binrw;
 use crate::ByteSpan;
+use crate::chardat::CharacterData;
 
 #[binrw]
 #[br(little)]
@@ -73,4 +74,22 @@ impl CMP {
             parameters
         })
     }
-}
\ No newline at end of file
+}
+
+#[cfg(test)]
+mod tests {
+    use std::fs::read;
+    use std::path::PathBuf;
+
+    use super::*;
+
+    #[test]
+    fn test_invalid() {
+        let mut d = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        d.push("resources/tests");
+        d.push("random");
+
+        // Feeding it invalid data should not panic
+        CMP::from_existing(&read(d).unwrap());
+    }
+}