@Test void indexOf() { // GIVEN Supplier<LongIterator> items = () -> PrimitiveLongCollections.iterator( 10, 20, 30 ); // THEN assertEquals( -1, PrimitiveLongCollections.indexOf( items.get(), 55 ) ); assertEquals( 0, PrimitiveLongCollections.indexOf( items.get(), 10 ) ); assertEquals( 1, PrimitiveLongCollections.indexOf( items.get(), 20 ) ); assertEquals( 2, PrimitiveLongCollections.indexOf( items.get(), 30 ) ); }