public function testWithValue()
{
$this->assertArrayNotHasKey('five', $this->struct);
$copy = $this->struct->withValue('five', 5);
$this->assertNotSame($this->struct, $copy);
$this->assertArrayHasKey('five', $copy);
// Setting the same values should not copy
$another = $copy->withValue('five', 5);
$this->assertSame($copy, $another);
}
