@Test public void setToNullRepresentationAssignsNull() { variables.put("a", NULL); verify(exec).assign("a", null); }
@Test public void symbolsCanBeSet() { variables.put("a", "2"); verify(exec).assign("a", "2"); verifyNoMoreInteractions(exec); }
@Test public void setToNullAssignsNull() { variables.put("a", null); verify(exec).assign("a", null); }