// Test with null
        searchRenderData.setExecTime(null);
        assertNull(searchRenderData.getExecTime());

        // Test with empty string
        searchRenderData.setExecTime("");
        assertEquals("", searchRenderData.getExecTime());

        // Test with formatted time string
        searchRenderData.setExecTime("0.123 sec");
        assertEquals("0.123 sec", searchRenderData.getExecTime());