public function testConverged()
{
$mock = $this->getMockBuilder(StoppingCriteria::class)->setMethods(['converged'])->getMock();
$mock->expects($this->once())->method('converged')->with([0.01, 0.02, 0.03])->willReturn(true);
$stepped = new SteppedCriteria($mock, new Fixed(0.01));
$stepped->converged([1.0, 2.0, 3.0], []);
}