An ambiguous method when testing

I am trying to test a method calculate

from MyClass

:

// TestClass {
@Test
public void testCalculate() {
    MyClass tester = new MyClass();
    assertEquals((long)123, tester.calculate().get(5));
}

// MyClass
public ArrayList<Long> calculate() {} // signature

      

        
        
        
      

    

Unfortunately I am getting the following error:

The method assertEquals(Object, Object) is ambiguous for the type TestClass

      

        
        
        
      

    

What am I doing wrong? The return type calculate

is ArrayList

with long

-values ​​and I expect the long

number 123.

When I do the following it works:

// TestClass {
@Test
public void testCalculate() {
    MyClass tester = new MyClass();
    ArrayList<Long> arr = new ArrayList<Long>();
    arr.add((long) 123);
    assertEquals(arr.get(0), tester.calculate().get(5));
}