### Question:
SpringModelAdjuster implements ModelAdjuster { public String getModelKey() { return modelKey; }  @Override @Nullable Object adjust(@Nullable final Object obj); void setModelKey(final String modelKey); String getModelKey();  }### Answer:
@Test public void defaultModelKey() throws Exception { Assert.assertEquals("model key should be 'model'", "model", springModelAdjuster.getModelKey()); }