### Question:
JoiningExpressionImpl implements JoiningExpression<T> { @Override public List<ToString<T>> expressions() { return expressions; } JoiningExpressionImpl(
            final CharSequence separator,
            final CharSequence prefix,
            final CharSequence suffix,
            final List<ToString<T>> expressions); @Override List<ToString<T>> expressions(); @Override CharSequence prefix(); @Override CharSequence suffix(); @Override CharSequence separator(); @Override String apply(T object);  }### Answer:
@Test void expressions() { assertEquals(2, instance.expressions().size()); }