If you're talking about the Sample tests, maybe you edited it? Click Reset of change it manually.

In my case, test 5 still had the number 2 as the expected answer.
Thank you very much.

Are you sure about that? I've tried your current Java code and it worked.

This is the fixed test with that input:

    @Test
    public void test5() {
        List<String> a =  new ArrayList<String>();
        a.add(":)"); a.add(":)"); a.add("x-]"); a.add(":ox"); a.add(";-("); a.add(";-)"); a.add(";~("); a.add(":~D");
        assertEquals(4, SmileFaces.countSmileys(a));
    }

And you can see the expected answer is 4 there.

In this case, there should be four happy faces: [:), :), x-], :ox, ;-(, ;-), ;~(, :~D]
:), :), ;-), :~D
However, according to the test case, there are only two.

Even if we remove the repeated one, there are still three faces that meet the condition.