diff --git a/internal/ethapi/transaction_args_test.go b/internal/ethapi/transaction_args_test.go
index cb5b8da3a5..987aab196c 100644
--- a/internal/ethapi/transaction_args_test.go
+++ b/internal/ethapi/transaction_args_test.go
@@ -294,11 +294,16 @@ func TestSetFeeDefaults(t *testing.T) {
 		}
 		got := test.in
 		err := got.setFeeDefaults(ctx, b)
-		if err != nil && err.Error() == test.err.Error() {
-			// Test threw expected error.
+		if err != nil {
+			if test.err == nil {
+				t.Fatalf("test %d (%s): unexpected error: %s", i, test.name, err)
+			} else if err.Error() != test.err.Error() {
+				t.Fatalf("test %d (%s): unexpected error: (got: %s, want: %s)", i, test.name, err, test.err)
+			}
+			// Matching error.
 			continue
-		} else if err != nil {
-			t.Fatalf("test %d (%s): unexpected error: %s", i, test.name, err)
+		} else if test.err != nil {
+			t.Fatalf("test %d (%s): expected error: %s", i, test.name, test.err)
 		}
 		if !reflect.DeepEqual(got, test.want) {
 			t.Fatalf("test %d (%s): did not fill defaults as expected: (got: %v, want: %v)", i, test.name, got, test.want)