JUnit Test For Sorted ArrayList-CodePudding

so, I have method:

public List<Map.Entry<String, Integer>> sortMap(HashMap<String, Integer> map) {
        List<Map.Entry<String, Integer>> list = new ArrayList<>(map.entrySet());
        list.sort((o1, o2) -> {
            int value = o2.getValue().compareTo(o1.getValue());
            if (value != 0) {
                return value;
            }
            return o1.getKey().compareTo(o2.getKey());
        });
        return list;
    }

I need a JUnit test for him. Actually, I started code it, but i dont know how to finish it right

       @Test
        public void shouldReturnCurrentList() {
            Object object = new Object();
                List<Map.Entry<String, Integer>> testList = new ArrayList<>(testMap.entrySet());
                testMap.put("One", 1);
                testMap.put("Two", 2);
                testMap.put("Three", 3);
                testMap.put("Four", 4);
        
                object.sortMap(testMap); 
}

CodePudding user response：

Create the Map. In this case I'm adding an element that has a duplicated value.

  Map<String,Integer> map = new HashMap<>();
  map.put("One", 1);
  map.put("Two", 2);
  map.put("Three", 3);
  map.put("Four", 4);
  map.put("AnotherFour", 4);

Now invoke the method

List<Map.Entry<String, Integer>> actual = SUT.sortMap(map);

Now test the order based on how we expect the Map to be processed. For out map, the order of the keys should be "One", "Two", "Three", "AnotherFour", "Four" and the order of the values should be 1, 2, 3, 4, 4.

Assert.assertEquals("One", actual.get(0).getKey());
Assert.assertEquals(1, actual.get(0).getValue()); 
Assert.assertEquals("Two", actual.get(1).getKey());
Assert.assertEquals(2, actual.get(1).getValue()); 
Assert.assertEquals("Three", actual.get(2).getKey());
Assert.assertEquals(3, actual.get(2).getValue()); 
Assert.assertEquals("AnotherFour", actual.get(3).getKey());
Assert.assertEquals(4, actual.get(3).getValue()); 
Assert.assertEquals("Four", actual.get(4).getKey());
Assert.assertEquals(4, actual.get(4).getValue());