diff --git a/src/semver.rs b/src/semver.rs
index 9c30acb..576b1eb 100644
--- a/src/semver.rs
+++ b/src/semver.rs
@@ -61,6 +61,14 @@ impl From<SemVer> for u64 {
     }
 }
 
+impl TryFrom<u64> for SemVer {
+    type Error = Error;
+
+    fn try_from(value: u64) -> Result<Self, Self::Error> {
+        todo!()
+    }
+}
+
 impl PartialEq for SemVer {
     fn eq(&self, other: &Self) -> bool {
         self.major == other.major
@@ -115,4 +123,38 @@ mod tests {
             }
         )
     }
+
+    #[test]
+    fn to_string() {
+        let mut s = SemVer {
+            major: 1,
+            minor: 0,
+            patch: 2,
+            pre: PreRelease::None,
+        };
+        assert_eq!(s.to_string(), "1.0.2");
+        s = SemVer {
+            major: 2,
+            minor: 1,
+            patch: 14,
+            pre: PreRelease::Beta(Some(NonZeroU16::new(2).unwrap())),
+        };
+        assert_eq!(s.to_string(), "2.1.14_beta2");
+    }
+
+    #[test]
+    fn eq() {
+        todo!()
+    }
+
+    #[test]
+    fn ord() {
+        let a: SemVer = "1.0.2".parse().unwrap();
+        let b: SemVer = "1.0.3".parse().unwrap();
+        let c: SemVer = "1.0.2_alpha1".parse().unwrap();
+        let d: SemVer = "1.0.2_alpha2".parse().unwrap();
+        assert!(a < b);
+        assert!(c < a);
+        assert!(d > c);
+    }
 }