在 Spock 中模拟 RestOperations.exchange（带有可变参数的重载方法）答案

【问题标题】：Mocking RestOperations.exchange in Spock (overloaded method with varargs)在 Spock 中模拟 RestOperations.exchange（带有可变参数的重载方法）
【发布时间】：2020-04-10 07:16:50
【问题描述】：

我正在尝试在 Spock 中模拟 org.springframework.web.client.RestOperations.exchange。 Spock 失败了

Too few invocations for:

1 * restOperations.exchange("https://test.com", HttpMethod.POST, _ as HttpEntity, String)   (0 invocations)

Unmatched invocations (ordered by similarity):

1 * restOperations.exchange('https://test.com', POST, <whatever,[]>, class java.lang.String, [])

我认为问题与exchange 方法重载和我尝试调用的版本具有可变参数有关。

如何定义这种交互，以便测试成功？

MySubject.java：


import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.web.client.RestOperations;

public class MySubject {
    private final RestOperations rest;

    public MySubject(RestOperations rest) {
        this.rest = rest;
    }

    public void doStuff() {
        HttpEntity<String> httpEntity = new HttpEntity<>("whatever");
        rest.exchange("https://test.com", HttpMethod.POST, httpEntity);
    }
}

MyTest.groovy：


import org.apache.http.HttpEntity
import org.springframework.http.HttpMethod
import org.springframework.web.client.RestOperations
import spock.lang.Specification

class MyTest extends Specification {
    RestOperations restOperations = Mock(RestOperations)
    MySubject subject = new MySubject(restOperations)

    def "test"() {
        when:
        subject.doStuff()
        then:
        1 * restOperations.exchange("https://test.com", HttpMethod.POST, _ as HttpEntity, String)
    }
}

【问题讨论】：

标签： spring-mvc mocking spock

【解决方案1】：

你有多个问题：

在您导入的应用程序中org.springframework.http.HttpEntity，在测试中org.apache.http.HttpEntity。你需要纠正它。
您的应用程序中的调用 rest.exchange("https://test.com", HttpMethod.POST, httpEntity); 甚至无法编译，因为在 RestOperations 类中没有这样的签名。需要添加参数String.class。
在测试中您需要反映方法签名，包括可变参数，即真正的方法签名有 5 个参数。

如果你解决了所有这些问题，你的测试就会顺利运行：

package de.scrum_master.stackoverflow.q61135628;

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.web.client.RestOperations;

public class MySubject {
  private final RestOperations rest;

  public MySubject(RestOperations rest) {
    this.rest = rest;
  }

  public void doStuff() {
    HttpEntity<String> httpEntity = new HttpEntity<>("whatever");
    rest.exchange("https://test.com", HttpMethod.POST, httpEntity, String.class);
  }
}

package de.scrum_master.stackoverflow.q61135628

import org.springframework.http.HttpMethod
import org.springframework.web.client.RestOperations
import spock.lang.Specification

class MyTest extends Specification {
  RestOperations restOperations = Mock()
  MySubject subject = new MySubject(restOperations)

  def "test"() {
    when:
    subject.doStuff()

    then:
    1 * restOperations.exchange("https://test.com", HttpMethod.POST, _, String, _)
    // Or if you want to be more specific:
//  1 * restOperations.exchange("https://test.com", HttpMethod.POST, _, String, [])
  }
}

【讨论】：