diff --git a/src/prerelease.rs b/src/prerelease.rs
index 76d5f2e..9848b1b 100644
--- a/src/prerelease.rs
+++ b/src/prerelease.rs
@@ -207,4 +207,15 @@ mod tests {
         assert_eq!("Rc".parse::<PreRelease>().unwrap(), PreRelease::RC(None));
         assert_eq!("RC".parse::<PreRelease>().unwrap(), PreRelease::RC(None));
     }
+
+    #[test]
+    fn equality() {
+        let a: u16 = PreRelease::Alpha(None).into();
+        let b: u16 = PreRelease::Alpha(Some(NonZeroU16::new(1).unwrap())).into();
+        assert_eq!(a, b);
+        assert_eq!(
+            PreRelease::Alpha(None),
+            PreRelease::Alpha(Some(NonZeroU16::new(1).unwrap())),
+        );
+    }
 }