diff --git a/crates/ef-testing/src/models/case.rs b/crates/ef-testing/src/models/case.rs
index a809abc6..f8835109 100644
--- a/crates/ef-testing/src/models/case.rs
+++ b/crates/ef-testing/src/models/case.rs
@@ -77,7 +77,7 @@ impl BlockchainTestCase {
                 | "mulmod.json" // kakarot #695
                 | "divByZero.json" // kakarot #695
                 | "jumpi.json" // kakarot #693
-                | "jump.json" // ef-tests #38 
+                | "jump.json" // ef-tests #38
                 | "jumpToPush.json" // ef-tests #61
                 | "signextend.json" // kakarot #677
                 | "mload.json" // ef-tests #31
@@ -88,6 +88,10 @@ impl BlockchainTestCase {
                 | "suicide.json" // ef-tests #57
                 | "blockInfo.json" // ef-tests #67
                 | "envInfo.json" // ef-tests #63
+                | "memCopySelf.json" // ef-tests #52
+                | "bufferSrcOffset.json" // ef-tests #51
+                | "buffer.json" // ef-tests #50
+                | "oog.json" // ef-tests #49
         )
     }
 
diff --git a/crates/ef-testing/src/utils/assert.rs b/crates/ef-testing/src/utils/assert.rs
index 9a030e57..43cc5ad3 100644
--- a/crates/ef-testing/src/utils/assert.rs
+++ b/crates/ef-testing/src/utils/assert.rs
@@ -31,10 +31,7 @@ pub fn assert_contract_post_state(
     if actual_nonce != account_nonce {
         return Err(RunnerError::Other(format!(
             "{} expected nonce {} for {:#20x}, got {}",
-            test_name,
-            account_nonce.to_string(),
-            evm_address,
-            actual_nonce.to_string()
+            test_name, account_nonce, evm_address, actual_nonce
         )));
     }
 
@@ -70,10 +67,7 @@ pub fn assert_contract_post_storage(
             if actual_state_value != value {
                 return Err(RunnerError::Other(format!(
                     "{} expected storage value {} for {:#20x}, got {}",
-                    test_name,
-                    value.to_string(),
-                    evm_address,
-                    actual_state_value.to_string()
+                    test_name, value, evm_address, actual_state_value
                 )));
             }
         }
diff --git a/crates/ef-testing/tests/tests.rs b/crates/ef-testing/tests/tests.rs
index 010d94bf..e11e2832 100644
--- a/crates/ef-testing/tests/tests.rs
+++ b/crates/ef-testing/tests/tests.rs
@@ -60,4 +60,5 @@ mod blockchain_tests {
     use super::*;
 
     blockchain_tests!(vm_tests, VMTests);
+    blockchain_tests!(memory_tests, stMemoryTest);
 }