java - 如何实现 hamcrest 匹配器

Question

我想运行这行代码:

assertThat(contextPin.get(), equalTo(pinPage.getPinObjFromUi()));

但我想打印到日志中以提供信息

这意味着我可以知道哪些字段不相等。

所以我想到了实现一个匹配器。

我用谷歌搜索过，但写不正确

因为我的方法无法将 actual 和 expected 对象放在一起。

这是我的代码:

我怎样才能把它写干净？

public class PinMatcher extends TypeSafeMatcher<Pin> {

    private Pin actual;
    private Object item;

    public PinMatcher(Pin actual) {
        this.actual = actual;
    }

    @Override
    protected boolean matchesSafely(Pin item) {
        return false;
    }

    @Override
    public void describeTo(Description description) {

    }

//cannot override this way
    @Override
    public boolean matches(Object item){
       assertThat(actual.title, equalTo(expected.title));
return true;
    }

//cannot access actual when called like this:
// assertThat(contextPin.get(), new PinMatcher.pinMatches(pinPage.getPinObjFromUi()));
    @Override
    public boolean pinMatches(Object item){
        assertThat(actual.title, equalTo(expected.title));
return true;
    }
}

Answer 1

尝试更像这样的东西:

package com.mycompany.core;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;


public class PinMatcher extends TypeSafeMatcher<Pin> {

    private Pin actual;

    public PinMatcher(Pin actual) {
        this.actual = actual;
    }

    @Override
    protected boolean matchesSafely(Pin item) {
        return actual.title.equals(item.title);
    }

    @Override
    public void describeTo(Description description) {
        description.appendText("should match title ").appendText(actual.title);

    }
}