用方法而不是值覆盖 Spock 模拟

Question

我知道使用 Spock 我可以创建一个 Mock 并在方法上设置返回值，例如

    idpClient.adminCreateUser(_) >> [
            user: new UserType()
    ]

如何在 Mock 上设置方法，以便自定义返回的值？我想做类似的事情：

    idpClient.metaClass.adminCreateUser = { AdminCreateUserRequest adminCreateUserRequest ->
        UserType user = new UserType()
        user.setUsername(adminCreateUserRequest.getUsername())
        AdminCreateUserResult result = new AdminCreateUserResult()
        result.setUser(user)
        return result
    }

虽然显然上述方法不起作用（它返回 null）。我查看了文档，但我发现的只是如何返回一个固定值（见上文）。

Answer 1

也许您应该阅读 Spock 手册。在computing return values 上有一个部分。无需使用元类，Spock DSL 为存根提供了句法手段。

我为你编了这个小例子作为MCVE：

package de.scrum_master.stackoverflow.q64961803;

class UserType {
  private String userName;
  public void setUserName(String userName) { this.userName = userName; }
  public String getUserName() { return userName; }
}

package de.scrum_master.stackoverflow.q64961803;

public class AdminCreateUserResult {
  private UserType user;
  public void setUser(UserType user) { this.user = user; }
  public UserType getUser() { return user; }
}

package de.scrum_master.stackoverflow.q64961803;

public class AdminCreateUserRequest {
  private String userName;
  public AdminCreateUserRequest(String userName) { this.userName = userName; }
  public String getUserName() { return userName; }
}

package de.scrum_master.stackoverflow.q64961803;

public class IDPClient {
  public AdminCreateUserResult adminCreateUser(AdminCreateUserRequest adminCreateUserRequest) {
    AdminCreateUserResult userResult = new AdminCreateUserResult();
    UserType userType = new UserType();
    userType.setUserName("real user");
    userResult.setUser(userType);
    return userResult;
  }
}

相应的 Spock 规范如下所示：

package de.scrum_master.stackoverflow.q64961803

import spock.lang.Specification

class IDPClientTest extends Specification {
  def test() {
    given: "mock IDPClient with stubbed method"
    IDPClient idpClient = Mock() {
      adminCreateUser(_) >> { AdminCreateUserRequest adminCreateUserRequest ->
        UserType user = new UserType()
        user.setUserName(adminCreateUserRequest.getUserName())
        AdminCreateUserResult result = new AdminCreateUserResult()
        result.setUser(user)
        result
      }
    }
    def request = new AdminCreateUserRequest("test user")

    expect: "real IDPClient behaves normally"
    new IDPClient().adminCreateUser(request).user.userName == "real user"

    and: "mock IDPClient displays stub behaviour"
    idpClient.adminCreateUser(request).user.userName == "test user"
  }
}