diff --git a/tests/client_test.go b/tests/client_test.go
index 99fd03ce..016b88aa 100644
--- a/tests/client_test.go
+++ b/tests/client_test.go
@@ -15,7 +15,15 @@ func subTestClient(t *testing.T, mc *mockServer) {
 }
 
 func client_valid_json_test(mc *mockServer) error {
-	if _, err := mc.Do("OUTPUT", "JSON"); err != nil {
+	if err := mc.DoBatch([][]interface{}{
+		// tests removal of "elapsed" member.
+		{"OUTPUT", "json"}, {`{"ok":true}`},
+		{"OUTPUT", "resp"}, {`OK`},
+	}); err != nil {
+		return err
+	}
+	// run direct commands
+	if _, err := mc.Do("OUTPUT", "json"); err != nil {
 		return err
 	}
 	res, err := mc.Do("CLIENT", "list")
diff --git a/tests/mock_test.go b/tests/mock_test.go
index f4f5f2d6..77825e87 100644
--- a/tests/mock_test.go
+++ b/tests/mock_test.go
@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/gomodule/redigo/redis"
+	"github.com/tidwall/sjson"
 	"github.com/tidwall/tile38/core"
 	tlog "github.com/tidwall/tile38/internal/log"
 	"github.com/tidwall/tile38/internal/server"
@@ -195,6 +196,12 @@ func (mc *mockServer) DoExpect(expect interface{}, commandName string, args ...i
 		}
 		return err
 	}
+	if b, ok := resp.([]byte); ok && len(b) > 1 && b[0] == '{' {
+		b, err = sjson.DeleteBytes(b, "elapsed")
+		if err == nil {
+			resp = b
+		}
+	}
 	oresp := resp
 	resp = normalize(resp)
 	if expect == nil && resp != nil {