fix for unit tests: do not call NewAccessWitness in NewEVMTxContext (#49

)

* potential fix: do not call NewAccessWitness in NewEVMTxContext

* more fixes: check for the existence of Accesses

* fix absence of witness in copy

* fix another witness issue

* workaround: ensure the prefetcher is off in verkle mode

* fix the remaining issues in tests

* review feedback

* fix witness allocation in stateless test

miner/worker_test.go

@@ -267,10 +267,7 @@ func testGenerateBlockAndImport(t *testing.T, isClique bool) {
 			if _, err := chain.InsertChain([]*types.Block{block}); err != nil {
 				t.Fatalf("failed to insert new mined block %d: %v", block.NumberU64(), err)
 			}
-		// TODO(gballet) the timeout had to be increased from 3s to 7s with verkle
-		// trees, presumably because calculating an address is orders of magnitude
-		// slower with perdersen_hash not using the multi-exponentiation.
-		case <-time.After(5 * time.Second): // Worker needs 1s to include new changes.
+		case <-time.After(3 * time.Second): // Worker needs 1s to include new changes.
 			t.Fatalf("timeout")
 		}
 	}