diff --git a/tests/evil.rs b/tests/evil.rs
new file mode 100644
index 0000000..f35a8be
--- /dev/null
+++ b/tests/evil.rs
@@ -0,0 +1,131 @@
+use std::num::FpCategory;
+use std::ops::{Add, Div, Mul, Neg, Rem, Sub};
+use num_traits::float::FloatCore;
+use num_traits::{Num, NumCast, One, ToPrimitive, Zero};
+use ordered_float::{NotNan};
+
+#[derive(PartialOrd, PartialEq)]
+struct EvilFloat(f32);
+
+impl Zero for EvilFloat {
+    fn zero() -> Self {
+        todo!()
+    }
+
+    fn is_zero(&self) -> bool {
+        todo!()
+    }
+}
+
+impl Add for EvilFloat {
+    type Output = Self;
+
+    fn add(self, _: Self) -> Self::Output {
+        todo!()
+    }
+}
+
+impl One for EvilFloat {
+    fn one() -> Self {
+        todo!()
+    }
+}
+
+impl Mul for EvilFloat {
+    type Output = Self;
+
+    fn mul(self, _: Self) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Sub for EvilFloat {
+    type Output = Self;
+
+    fn sub(self, _: Self) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Div for EvilFloat {
+    type Output = Self;
+
+    fn div(self, _: Self) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Rem for EvilFloat {
+    type Output = Self;
+
+    fn rem(self, _: Self) -> Self::Output {
+        todo!()
+    }
+}
+
+impl NumCast for EvilFloat {
+    fn from<T: ToPrimitive>(_: T) -> Option<Self> {
+        todo!()
+    }
+}
+
+impl ToPrimitive for EvilFloat {
+    fn to_i64(&self) -> Option<i64> {
+        todo!()
+    }
+
+    fn to_u64(&self) -> Option<u64> {
+        todo!()
+    }
+}
+
+impl Neg for EvilFloat {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Copy for EvilFloat {}
+
+impl Clone for EvilFloat {
+    fn clone(&self) -> Self {
+        todo!()
+    }
+}
+
+impl FloatCore for EvilFloat {
+    fn is_nan(self) -> bool {
+        false
+    }
+  fn infinity() -> Self { todo!() }
+  fn neg_infinity() -> Self { todo!() }
+  fn nan() -> Self { todo!() }
+  fn neg_zero() -> Self { todo!() }
+  fn min_value() -> Self { todo!() }
+  fn min_positive_value() -> Self { todo!() }
+  fn epsilon() -> Self { todo!() }
+  fn max_value() -> Self { todo!() }
+  fn classify(self) -> FpCategory { todo!() }
+  fn to_degrees(self) -> Self { todo!() }
+  fn to_radians(self) -> Self { todo!() }
+  fn integer_decode(self) -> (u64, i16, i8) { todo!() }
+
+}
+
+impl Num for EvilFloat {
+    type FromStrRadixErr = ();
+
+    fn from_str_radix(_: &str, _: u32) -> Result<Self, Self::FromStrRadixErr> {
+        todo!()
+    }
+}
+
+#[test]
+#[should_panic]
+fn test_cmp_panic() {
+    let evil_value = NotNan::new(EvilFloat(f32::NAN)).unwrap();
+    let x = NotNan::new(EvilFloat(0.0)).unwrap();
+    let _ = evil_value.cmp(&x);
+}