diff --git a/halo2_proofs/tests/compress_selectors.rs b/halo2_proofs/tests/compress_selectors.rs
index 19083d76b..1d264f403 100644
--- a/halo2_proofs/tests/compress_selectors.rs
+++ b/halo2_proofs/tests/compress_selectors.rs
@@ -19,7 +19,7 @@ use halo2_proofs::plonk::{
 use halo2_proofs::poly::kzg::commitment::{KZGCommitmentScheme, ParamsKZG};
 use halo2_proofs::poly::kzg::multiopen::{ProverSHPLONK, VerifierSHPLONK};
 use halo2_proofs::poly::kzg::strategy::SingleStrategy;
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 use halo2curves::bn256::{Bn256, Fr, G1Affine};
 
 #[derive(Debug, Clone)]
@@ -425,15 +425,15 @@ How the `compress_selectors` works in `MyCircuit` under the hood:
 #[test]
 fn test_success() -> Result<(), halo2_proofs::plonk::Error> {
     // vk & pk keygen both WITH compress
-    assert_eq!(
+    assert_test_proof(
         "8083f3ecb002d25d66682a08581d9dfdf9c621e7d290db62238f8bc7b671eb1b",
-        test_mycircuit(true, true).map(keccak_hex)?
+        test_mycircuit(true, true)?,
     );
 
     // vk & pk keygen both WITHOUT compress
-    assert_eq!(
+    assert_test_proof(
         "dbb85c029aa10ad0d5aa3f9711472f39dfe67cd82dc27a66ea403ad0ec499dc9",
-        test_mycircuit(false, false).map(keccak_hex)?
+        test_mycircuit(false, false)?,
     );
 
     Ok(())
diff --git a/halo2_proofs/tests/frontend_backend_split.rs b/halo2_proofs/tests/frontend_backend_split.rs
index 9a5f7b477..fd757d5f4 100644
--- a/halo2_proofs/tests/frontend_backend_split.rs
+++ b/halo2_proofs/tests/frontend_backend_split.rs
@@ -28,7 +28,7 @@ use halo2_frontend::{
     },
 };
 use halo2_middleware::{ff::Field, poly::Rotation};
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 use std::collections::HashMap;
 
 #[derive(Clone)]
@@ -545,12 +545,10 @@ fn test_mycircuit_full_legacy() {
     .expect("verify succeeds");
     println!("Verify: {:?}", start.elapsed());
 
-    if cfg!(feature = "thread-safe-region") {
-        assert_eq!(
-            "c5c11281474b586795a5d97bdefeee80456d2921584b3a8b00523eebd49f2fac",
-            keccak_hex(proof)
-        );
-    }
+    assert_test_proof(
+        "c5c11281474b586795a5d97bdefeee80456d2921584b3a8b00523eebd49f2fac",
+        proof,
+    );
 }
 
 #[test]
@@ -632,10 +630,8 @@ fn test_mycircuit_full_split() {
     .expect("verify succeeds");
     println!("Verify: {:?}", start.elapsed());
 
-    if cfg!(feature = "thread-safe-region") {
-        assert_eq!(
-            "e612e9d5ebcdcff5ed9823c527218cdbaaf9fe76cc5e42d05a60f652dcc92660",
-            keccak_hex(proof)
-        );
-    }
+    assert_test_proof(
+        "e612e9d5ebcdcff5ed9823c527218cdbaaf9fe76cc5e42d05a60f652dcc92660",
+        proof,
+    );
 }
diff --git a/halo2_proofs/tests/plonk_api.rs b/halo2_proofs/tests/plonk_api.rs
index 3686de5d5..cf0a96b89 100644
--- a/halo2_proofs/tests/plonk_api.rs
+++ b/halo2_proofs/tests/plonk_api.rs
@@ -23,7 +23,7 @@ use halo2_proofs::transcript::{
     TranscriptWriterBuffer,
 };
 use halo2_test_utils::test_rng;
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 use rand_core::RngCore;
 use std::marker::PhantomData;
 
@@ -602,9 +602,9 @@ fn plonk_api() {
             AccumulatorStrategy<_>,
         >(&verifier_params, pk.get_vk(), &proof[..]);
 
-        assert_eq!(
+        assert_test_proof(
             "07382b50df5d591f5f54f99b09577f971986e4c343e8d050fb064432fda4be95",
-            keccak_hex(proof)
+            proof,
         );
     }
 
@@ -636,9 +636,9 @@ fn plonk_api() {
             AccumulatorStrategy<_>,
         >(&verifier_params, pk.get_vk(), &proof[..]);
 
-        assert_eq!(
+        assert_test_proof(
             "32bb491e0f52a10f3361fc0aea6ea5aee3128f431e0fb846338e501c810dba49",
-            keccak_hex(proof)
+            proof,
         );
     }
 
diff --git a/halo2_proofs/tests/serialization.rs b/halo2_proofs/tests/serialization.rs
index e2856c28a..1a2d1e1fe 100644
--- a/halo2_proofs/tests/serialization.rs
+++ b/halo2_proofs/tests/serialization.rs
@@ -23,7 +23,7 @@ use halo2_proofs::{
     },
     SerdeFormat,
 };
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 use halo2curves::bn256::{Bn256, Fr, G1Affine};
 
 #[derive(Clone, Copy)]
@@ -190,8 +190,8 @@ fn test_serialization() {
     )
     .is_ok());
 
-    assert_eq!(
+    assert_test_proof(
         "09e497a9a52d56f23d3f2cf832b5849a1ebbaab2086dec90144b3eb1a38b5331",
-        keccak_hex(proof)
+        proof,
     )
 }
diff --git a/halo2_proofs/tests/shuffle.rs b/halo2_proofs/tests/shuffle.rs
index 69bb5c476..97d8ce604 100644
--- a/halo2_proofs/tests/shuffle.rs
+++ b/halo2_proofs/tests/shuffle.rs
@@ -18,7 +18,7 @@ use halo2_proofs::{
         Blake2bRead, Blake2bWrite, Challenge255, TranscriptReadBuffer, TranscriptWriterBuffer,
     },
 };
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 use rand_chacha::ChaCha20Rng;
 use rand_core::{RngCore, SeedableRng};
 use std::iter;
@@ -333,9 +333,9 @@ fn test_shuffle() {
     {
         test_mock_prover(K, circuit.clone(), Ok(()));
         let proof = test_prover::<EqAffine, W, H>(K, circuit.clone(), true);
-        assert_eq!(
+        assert_test_proof(
             "dba3dbe7a83a719ec028317511e260b8c8e6207dc62b2d1ecd8ba0fa6ddc39ed",
-            keccak_hex(proof)
+            proof,
         );
     }
 
@@ -361,9 +361,9 @@ fn test_shuffle() {
             )]),
         );
         let proof = test_prover::<EqAffine, W, H>(K, circuit, false);
-        assert_eq!(
+        assert_test_proof(
             "0b4e97f2d561fae56fe893333eba2df5228c78e80f8bd7c509d4d40d127dff92",
-            keccak_hex(proof)
+            proof,
         );
     }
 }
diff --git a/halo2_proofs/tests/shuffle_api.rs b/halo2_proofs/tests/shuffle_api.rs
index 988bbd67e..c405d23e3 100644
--- a/halo2_proofs/tests/shuffle_api.rs
+++ b/halo2_proofs/tests/shuffle_api.rs
@@ -22,7 +22,7 @@ use halo2_proofs::{
         Blake2bRead, Blake2bWrite, Challenge255, TranscriptReadBuffer, TranscriptWriterBuffer,
     },
 };
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 use halo2curves::{pasta::EqAffine, CurveAffine};
 
 struct ShuffleChip<F: Field> {
@@ -219,8 +219,8 @@ fn test_shuffle_api() {
     prover.assert_satisfied();
     let proof = test_prover::<EqAffine>(K, circuit, true);
 
-    assert_eq!(
+    assert_test_proof(
         "10866a2a15d9cf36b36045277cae71057702f61a41ef56b04f813c30a5f8daa0",
-        keccak_hex(proof)
+        proof,
     );
 }
diff --git a/halo2_proofs/tests/vector-ops-unblinded.rs b/halo2_proofs/tests/vector-ops-unblinded.rs
index 83babafa4..86fffb7c9 100644
--- a/halo2_proofs/tests/vector-ops-unblinded.rs
+++ b/halo2_proofs/tests/vector-ops-unblinded.rs
@@ -21,7 +21,7 @@ use halo2_proofs::{
         Blake2bRead, Blake2bWrite, Challenge255, TranscriptReadBuffer, TranscriptWriterBuffer,
     },
 };
-use halo2_test_utils::{keccak_hex, one_rng};
+use halo2_test_utils::{assert_test_proof, one_rng};
 
 // ANCHOR: instructions
 trait NumericInstructions<F: Field>: Chip<F> {
@@ -547,16 +547,16 @@ fn test_vector_ops_unbinded() {
 
     // the commitments will be the first columns of the proof transcript so we can compare them easily
     let proof_1 = test_prover::<halo2curves::pasta::EqAffine>(k, mul_circuit, true, c_mul);
-    assert_eq!(
+    assert_test_proof(
         "845349549e3776ba45e5bc03d44fd44f8e65f6338e8b7b8975dcc4f310094bf3",
-        keccak_hex(&proof_1)
+        &proof_1,
     );
 
     // the commitments will be the first columns of the proof transcript so we can compare them easily
     let proof_2 = test_prover::<halo2curves::pasta::EqAffine>(k, add_circuit, true, c_add);
-    assert_eq!(
+    assert_test_proof(
         "55f4b12e359be5541f539f74ae2b4afd2206160609faa1b902d90e91bfd4a641",
-        keccak_hex(&proof_2)
+        &proof_2,
     );
 
     // the commitments will be the first columns of the proof transcript so we can compare them easily
diff --git a/halo2_test_utils/src/lib.rs b/halo2_test_utils/src/lib.rs
index 14e52b4bd..61f1c3bbe 100644
--- a/halo2_test_utils/src/lib.rs
+++ b/halo2_test_utils/src/lib.rs
@@ -21,14 +21,24 @@ pub fn one_rng() -> BlockRng<OneNg> {
     BlockRng::<OneNg>::new(OneNg {})
 }
 
+// Random number generator for testing
+
 pub fn test_rng() -> OsRng {
     OsRng
 }
 
-pub fn keccak_hex<D: AsRef<[u8]>>(data: D) -> String {
+fn keccak_hex<D: AsRef<[u8]>>(data: D) -> String {
     let mut hash = [0u8; 32];
     let mut hasher = tiny_keccak::Keccak::v256();
     hasher.update(data.as_ref());
     hasher.finalize(&mut hash);
     hex::encode(hash)
 }
+
+// Check the a test proof against a known hash
+// Note that this function is only called in CI in "cargo test --all-fetaures"
+pub fn assert_test_proof<D: AsRef<[u8]>>(hex: &str, data: D) {
+    if cfg!(all(feature = "thread-safe-region", not(coverage))) {
+        assert_eq!(keccak_hex(data), hex);
+    }
+}