diff --git a/proof-input/tests/sampling.rs b/proof-input/tests/sampling.rs
new file mode 100644
index 0000000..192918f
--- /dev/null
+++ b/proof-input/tests/sampling.rs
@@ -0,0 +1,70 @@
+use plonky2::hash::poseidon::PoseidonHash;
+use plonky2::plonk::config::PoseidonGoldilocksConfig;
+use plonky2_field::goldilocks_field::GoldilocksField;
+
+// types used in all tests
+type F = GoldilocksField;
+const D: usize = 2;
+type H = PoseidonHash;
+type C = PoseidonGoldilocksConfig;
+
+
+#[cfg(test)]
+mod sampling_tests {
+    use super::*;
+    use proof_input::input_generator::InputGenerator;
+
+    // Test sample cells (non-circuit)
+    #[test]
+    fn test_gen_verify_proof(){
+        let input_gen = InputGenerator::<F,D,H>::default();
+        let w = input_gen.gen_testing_circuit_input();
+        assert!(input_gen.verify_circuit_input(w));
+    }
+}
+
+#[cfg(test)]
+mod sampling_circuit_tests {
+    use super::*;
+    use std::time::Instant;
+    use plonky2::plonk::proof::ProofWithPublicInputs;
+    use codex_plonky2_circuits::circuit_helper::Plonky2Circuit;
+    use codex_plonky2_circuits::circuits::sample_cells::SampleCircuit;
+    use proof_input::input_generator::InputGenerator;
+    use proof_input::params::Params;
+
+    // Test sample cells in-circuit for a selected slot
+    #[test]
+    fn test_proof_in_circuit() -> anyhow::Result<()> {
+        // get input
+        let mut params = Params::default();
+        params.set_n_samples(10);
+        let input_params = params.input_params;
+        let circuit_params = params.circuit_params;
+        let input_gen = InputGenerator::<F,D,H>::new(input_params);
+        let circ_input = input_gen.gen_testing_circuit_input();
+
+        // build the circuit
+        let circ = SampleCircuit::<F,D,H>::new(circuit_params.clone());
+        let (targets, data) = circ.build_with_standard_config()?;
+        println!("circuit size = {:?}", data.common.degree_bits());
+
+        // separate the prover and verifier
+        let verifier_data = data.verifier_data();
+        let prover_data = data.prover_data();
+
+        // Prove the circuit using the circuit input
+        let start_time = Instant::now();
+        let proof_with_pis: ProofWithPublicInputs<F, C, D> = circ.prove(&targets, &circ_input, &prover_data)?;
+        println!("prove_time = {:?}", start_time.elapsed());
+
+        // Verify the proof
+        assert!(
+            verifier_data.verify(proof_with_pis).is_ok(),
+            "Merkle proof verification failed"
+        );
+
+        Ok(())
+    }
+
+}
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