我正在学习Java的学习课程，此人在Hamcrest库中使用contains()方法。代码如下所示

import org.junit.Test;

public class ShipmentTest
{
    private Shipment shipment = new Shipment();

    @Test
    public void shouldAddItems() throws Exception
    {
        shipment.add(door);
        shipment.add(window);

        assertThat(shipment, contains(door, window));
    }

    @Test
    public void shouldReplaceItems() throws Exception
    {
        shipment.add(door);
        shipment.add(window);

        shipment.replace(door, floorPanel);

        assertThat(shipment, contains(floorPanel, window));
    }
}

我使用的是Eclipse，它不能识别contains()方法，因为它是Hamcrest库的一部分。然而，当我尝试实现它时，Eclipse在Hamcrest库中找不到Matchers。它找到Matcher、CoreMatchers和MatcherAssert，但找不到Matchers，Matchers应该使用contains()方法。我已经下载了hamcrest 1.3版的JAR文件，但即使我将其包含在构建路径中，它仍然找不到Matcher。我应该做些什么？