Always call finish (#58)

src/algorithms/patience.rs

@@ -167,3 +167,32 @@ fn test_patience_out_of_bounds_bug() {
 
     insta::assert_debug_snapshot!(d.into_inner().ops());
 }
+
+#[test]
+fn test_finish_called() {
+    struct HasRunFinish(bool);
+
+    impl DiffHook for HasRunFinish {
+        type Error = ();
+        fn finish(&mut self) -> Result<(), Self::Error> {
+            self.0 = true;
+            Ok(())
+        }
+    }
+
+    let mut d = HasRunFinish(false);
+    let slice = &[1, 2];
+    let slice2 = &[1, 2, 3];
+    diff(&mut d, slice, 0..slice.len(), slice2, 0..slice2.len()).unwrap();
+    assert!(d.0);
+
+    let mut d = HasRunFinish(false);
+    let slice = &[1, 2];
+    diff(&mut d, slice, 0..slice.len(), slice, 0..slice.len()).unwrap();
+    assert!(d.0);
+
+    let mut d = HasRunFinish(false);
+    let slice: &[u8] = &[];
+    diff(&mut d, slice, 0..slice.len(), slice, 0..slice.len()).unwrap();
+    assert!(d.0);
+}