add tests

src/core/src/collection.rs

@@ -372,7 +372,7 @@ mod test {
         assert_eq!(cl.len(), 0);
     }
 
-    // lock down 'into_iter' implementation :sweat_smile:
+    // lock down 'iter' implementation :sweat_smile:
     #[test]
     fn collection_iter() {
         // load test sigs
@@ -388,7 +388,28 @@ mod test {
         // all sigs should remain
         assert_eq!(cl.len(), 4);
 
+        let _v: Vec<(Idx, &Record)> = cl.iter().into_iter().collect();
+        let _i = cl.len();
+    }
+
+    // lock down 'into_iter' implementation :sweat_smile:
+    #[test]
+    fn collection_into_iter() {
+        // load test sigs
+        let mut filename = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        // four num=500 sigs
+        filename.push("../../tests/test-data/genome-s11.fa.gz.sig");
+        let file = File::open(filename).unwrap();
+        let reader = BufReader::new(file);
+        let sigs: Vec<Signature> = serde_json::from_reader(reader).expect("Loading error");
+        assert_eq!(sigs.len(), 4);
+        // load sigs into collection + select compatible signatures
+        let cl = Collection::from_sigs(sigs).unwrap();
+        // all sigs should remain
+        assert_eq!(cl.len(), 4);
+
         let _v: Vec<(Idx, Record)> = cl.into_iter().into_iter().collect();
+        // let _i = cl.len(); // cl is consumed w/into_iter.
     }
 
     #[test]