Implement visitor for migration of Assert.assertEquals(Iterator, Iterator, String)

[Philzen]

JUnit 5 does not implement dedicated handling of iterators in Assertion.assertEquals(…) – i've done a quick UnitTest comparison, and if simply replaced, a test case that passed in TestNG will fail after the migration.

Following replacement works:

Before

void testMethod() {
    Iterator<?> actualIterator = Arrays.asList("Bar", "Foo").iterator();
    Iterator<?> expectedIterator = Arrays.asList("Bar", "Foo").iterator();
    
    Assert.assertEquals(actualIterator, expectedIterator, "Foo = equal");
}

After

void testMethod() {
    Iterator<?> actualIterator = Arrays.asList("Bar", "Foo").iterator();
    Iterator<?> expectedIterator = Arrays.asList("Bar", "Foo").iterator();
    
    Collection<Object> actualValues = new ArrayList<>();
    Collection<Object> expectedValues = new ArrayList<>();
    
    actual.forEachRemaining(actualValues::add);
    expected.forEachRemaining(expectedValues::add);
    
    Assertions.assertIterableEquals(iteratorElements, iterator2Elements, "Foo = equal");
}

IMHO it's unfortunately not possible to integrate this replacement into the Refaster Recipe, as that can only replace existing code with a single statement, therefore we'll need a dedicated visitor.

[Philzen]

Solved via d15e96c, thus will be implemented as part of #2