diff --git a/src/secp256k1/curve.rs b/src/secp256k1/curve.rs
index b295a5cd..f87deb8a 100644
--- a/src/secp256k1/curve.rs
+++ b/src/secp256k1/curve.rs
@@ -275,63 +275,4 @@ crate::curve_testing_suite!(Secp256k1);
 crate::curve_testing_suite!(Secp256k1, "endo_consistency");
 
 #[cfg(test)]
-mod extra_tests {
-    use super::*;
-    use ff::FromUniformBytes;
-    use rand_core::OsRng;
-
-    #[test]
-    fn ecdsa_example() {
-        fn mod_n(x: Fp) -> Fq {
-            let mut x_repr = [0u8; 32];
-            x_repr.copy_from_slice(x.to_repr().as_ref());
-            let mut x_bytes = [0u8; 64];
-            x_bytes[..32].copy_from_slice(&x_repr[..]);
-            Fq::from_uniform_bytes(&x_bytes)
-        }
-
-        let g = Secp256k1::generator();
-
-        for _ in 0..1000 {
-            // Generate a key pair
-            let sk = Fq::random(OsRng);
-            let pk = (g * sk).to_affine();
-
-            // Generate a valid signature
-            // Suppose `m_hash` is the message hash
-            let msg_hash = Fq::random(OsRng);
-
-            let (r, s) = {
-                // Draw arandomness
-                let k = Fq::random(OsRng);
-                let k_inv = k.invert().unwrap();
-
-                // Calculate `r`
-                let r_point = (g * k).to_affine().coordinates().unwrap();
-                let x = r_point.x();
-                let r = mod_n(*x);
-
-                // Calculate `s`
-                let s = k_inv * (msg_hash + (r * sk));
-
-                (r, s)
-            };
-
-            {
-                // Verify
-                let s_inv = s.invert().unwrap();
-                let u_1 = msg_hash * s_inv;
-                let u_2 = r * s_inv;
-
-                let v_1 = g * u_1;
-                let v_2 = pk * u_2;
-
-                let r_point = (v_1 + v_2).to_affine().coordinates().unwrap();
-                let x_candidate = r_point.x();
-                let r_candidate = mod_n(*x_candidate);
-
-                assert_eq!(r, r_candidate);
-            }
-        }
-    }
-}
+crate::curve_testing_suite!(Secp256k1, "ecdsa_example");
diff --git a/src/secp256r1/curve.rs b/src/secp256r1/curve.rs
index b225f313..0b71b1f1 100644
--- a/src/secp256r1/curve.rs
+++ b/src/secp256r1/curve.rs
@@ -95,65 +95,4 @@ impl Secp256r1 {
 crate::curve_testing_suite!(Secp256r1);
 
 #[cfg(test)]
-mod extra_tests {
-    use super::*;
-    use crate::group::Curve;
-    use crate::secp256r1::{Fp, Fq, Secp256r1};
-    use ff::FromUniformBytes;
-    use rand_core::OsRng;
-
-    #[test]
-    fn ecdsa_example() {
-        fn mod_n(x: Fp) -> Fq {
-            let mut x_repr = [0u8; 32];
-            x_repr.copy_from_slice(x.to_repr().as_ref());
-            let mut x_bytes = [0u8; 64];
-            x_bytes[..32].copy_from_slice(&x_repr[..]);
-            Fq::from_uniform_bytes(&x_bytes)
-        }
-
-        let g = Secp256r1::generator();
-
-        for _ in 0..1000 {
-            // Generate a key pair
-            let sk = Fq::random(OsRng);
-            let pk = (g * sk).to_affine();
-
-            // Generate a valid signature
-            // Suppose `m_hash` is the message hash
-            let msg_hash = Fq::random(OsRng);
-
-            let (r, s) = {
-                // Draw arandomness
-                let k = Fq::random(OsRng);
-                let k_inv = k.invert().unwrap();
-
-                // Calculate `r`
-                let r_point = (g * k).to_affine().coordinates().unwrap();
-                let x = r_point.x();
-                let r = mod_n(*x);
-
-                // Calculate `s`
-                let s = k_inv * (msg_hash + (r * sk));
-
-                (r, s)
-            };
-
-            {
-                // Verify
-                let s_inv = s.invert().unwrap();
-                let u_1 = msg_hash * s_inv;
-                let u_2 = r * s_inv;
-
-                let v_1 = g * u_1;
-                let v_2 = pk * u_2;
-
-                let r_point = (v_1 + v_2).to_affine().coordinates().unwrap();
-                let x_candidate = r_point.x();
-                let r_candidate = mod_n(*x_candidate);
-
-                assert_eq!(r, r_candidate);
-            }
-        }
-    }
-}
+crate::curve_testing_suite!(Secp256r1, "ecdsa_example");
diff --git a/src/tests/curve.rs b/src/tests/curve.rs
index 5fda91de..f04c1228 100644
--- a/src/tests/curve.rs
+++ b/src/tests/curve.rs
@@ -465,4 +465,64 @@ macro_rules! curve_testing_suite {
             }
         }
     };
+
+    ($curve: ident, "ecdsa_example") => {
+        #[test]
+        fn ecdsa_example() {
+            use ff::FromUniformBytes;
+            use rand_core::OsRng;
+
+            fn mod_n(x: <$curve as CurveExt>::Base) -> <$curve as CurveExt>::ScalarExt {
+                let mut x_repr = [0u8; 32];
+                x_repr.copy_from_slice(x.to_repr().as_ref());
+                let mut x_bytes = [0u8; 64];
+                x_bytes[..32].copy_from_slice(&x_repr[..]);
+                <$curve as CurveExt>::ScalarExt::from_uniform_bytes(&x_bytes)
+            }
+
+            let g = $curve::generator();
+
+            for _ in 0..1000 {
+                // Generate a key pair
+                let sk = <$curve as CurveExt>::ScalarExt::random(OsRng);
+                let pk = (g * sk).to_affine();
+
+                // Generate a valid signature
+                // Suppose `m_hash` is the message hash
+                let msg_hash = <$curve as CurveExt>::ScalarExt::random(OsRng);
+
+                let (r, s) = {
+                    // Draw arandomness
+                    let k = <$curve as CurveExt>::ScalarExt::random(OsRng);
+                    let k_inv = k.invert().unwrap();
+
+                    // Calculate `r`
+                    let r_point = (g * k).to_affine().coordinates().unwrap();
+                    let x = r_point.x();
+                    let r = mod_n(*x);
+
+                    // Calculate `s`
+                    let s = k_inv * (msg_hash + (r * sk));
+
+                    (r, s)
+                };
+
+                {
+                    // Verify
+                    let s_inv = s.invert().unwrap();
+                    let u_1 = msg_hash * s_inv;
+                    let u_2 = r * s_inv;
+
+                    let v_1 = g * u_1;
+                    let v_2 = pk * u_2;
+
+                    let r_point = (v_1 + v_2).to_affine().coordinates().unwrap();
+                    let x_candidate = r_point.x();
+                    let r_candidate = mod_n(*x_candidate);
+
+                    assert_eq!(r, r_candidate);
+                }
+            }
+        }
+    }
 }