Add invalid data test to CMP

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)]
@@ -74,3 +75,21 @@ impl CMP {
         })
     }
 }
+
+#[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());
+    }
+}