### Question:
ClientSettingsWrapper { public final void setFetchInterval(int intervalMs) { String intervalString = String.valueOf(intervalMs); properties.setProperty("fetchInterval", intervalString); } ClientSettingsWrapper(File settingsFile); final void setServerHostname(TankSelector tank, String hostname); final void setServerPort(TankSelector tank, int portServer); final void setFetchInterval(int intervalMs); final void setOverflowAlarm(TankSelector tank, boolean enabled); final void setUnderflowAlarm(TankSelector tank, boolean enabled); final void setOverheatingAlarm(TankSelector tank, boolean enabled); final void setUndercoolingAlarm(TankSelector tank, boolean enabled); final void setTempDiagram(TankSelector tank, boolean enabled); final void setFillLevelDiagram(TankSelector tank, boolean enabled); final int getFetchInterval(int defaultValue); final boolean getOverheatingAlarm(TankSelector tank, boolean defaultValue); final boolean getUndercoolingAlarm(TankSelector tank, boolean defaultValue); final boolean getOverflowAlarm(TankSelector tank, boolean defaultValue); final boolean getUnderflowAlarm(TankSelector tank, boolean defaultValue); final boolean getTempDiagram(TankSelector tank, boolean defaultValue); final boolean getFillLevelDiagram(TankSelector tank, boolean defaultValue); final String getHostname(TankSelector tank, String defaultValue); final int getPort(TankSelector tank, int defaultValue); final void saveSettings();  }### Answer:
@Test public void testSetFetchInterval() { wrapper.setFetchInterval(52); assertEquals(52, wrapper.getFetchInterval(-1)); }