用参数模拟构造函数 [英] Mock a constructor with parameter

问题描述

我有一个课程如下：

public class A {
    public A(String test) {
        bla bla bla
    }

    public String check() {
        bla bla bla
    }
}

构造函数中的逻辑 A（字符串测试）和 check（）是我试图模仿的东西。我想要任何调用，如： new A（$$$任何字符串$$$）.check（）返回一个虚拟字符串test。

The logic in the constructor A(String test) and check() are the things I am trying to mock. I want any calls like: new A($$$any string$$$).check() returns a dummy string "test".

我试过：

 A a = mock(A.class); 
 when(a.check()).thenReturn("test");

 String test = a.check(); // to this point, everything works. test shows as "tests"

 whenNew(A.class).withArguments(Matchers.anyString()).thenReturn(rk);
 // also tried:
 //whenNew(A.class).withParameterTypes(String.class).withArguments(Matchers.anyString()).thenReturn(rk);

 new A("random string").check();  // this doesn't work

但它似乎不起作用。 new A（$$$任何字符串$$$）.check（）仍然通过构造函数逻辑而不是获取 A的模拟对象。

But it doesn't seem to be working. new A($$$any string$$$).check() is still going through the constructor logic instead of fetch the mocked object of A.

推荐答案

您发布的代码适用于最新版本的Mockito和Powermockito。也许你还没准备好A？
试试这个：

The code you posted works for me with the latest version of Mockito and Powermockito. Maybe you haven't prepared A? Try this:

A.java

public class A {
     private final String test;

    public A(String test) {
        this.test = test;
    }

    public String check() {
        return "checked " + this.test;
    }
}

MockA.java

MockA.java

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(A.class)
public class MockA {
    @Test
    public void test_not_mocked() throws Throwable {
        assertThat(new A("random string").check(), equalTo("checked random string"));
    }
    @Test
    public void test_mocked() throws Throwable {
         A a = mock(A.class); 
         when(a.check()).thenReturn("test");
         PowerMockito.whenNew(A.class).withArguments(Mockito.anyString()).thenReturn(a);
         assertThat(new A("random string").check(), equalTo("test"));
    }
}

两个测试都应该通过mockito 1.9.0，powermockito 1.4.12和junit 4.8.2

Both tests should pass with mockito 1.9.0, powermockito 1.4.12 and junit 4.8.2

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