@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);
}
