String status check fails to check

I have a method for checking a group string:

public String validateGrouper(String grouper)
    {
        if(grouper!=null)
            grouper = grouper.trim();
        if(grouper==null || grouper.equals("") || !grouper.equalsIgnoreCase("AND") || !grouper.equalsIgnoreCase("OR"))
        {
            System.out.println("Trap for grouper validation triggered with grouper: "+grouper);
            grouper="AND";
        }
        else
            grouper = grouper.toUpperCase();
        return grouper;
    }

      

        
        
        
      

    

I am running it against this test:

@Test
public void testValidateGrouper(){
    DBUtils dbUtils = new DBUtils();
    assertEquals("Expect empty string to be replaced by AND","AND",dbUtils.validateGrouper(""));
    assertEquals("Expect spaced out string to be replaced by AND","AND",dbUtils.validateGrouper("   "));
    assertEquals("Expect the lower case and to be used as AND","AND",dbUtils.validateGrouper("and"));
    assertEquals("Expect the upper case AND to be used as AND","AND",dbUtils.validateGrouper("AND"));
    assertEquals("Expect the word CART to be ignored and replaced by AND","AND",dbUtils.validateGrouper("CART"));
    assertEquals("Expect AND to be used as the grouper if no grouper is provided","AND",dbUtils.validateGrouper(null));
    assertEquals("Expect the lower case or to be used as OR","OR",dbUtils.validateGrouper("or"));
    assertEquals("Expect the upper case OR to be used as OR","OR",dbUtils.validateGrouper("OR"));
}

      

        
        
        
      

    

I found that the condition always fires despite using AND

and OR

. I don't understand why the condition is failing.