How do you Test Getter and Setter Interface in Java using Mockit

  • 时间：2020-09-08 11:08:55
  • 分类：网络文摘
  • 阅读：112 次

Usually, we unit tests the logics. An interface is without implementation details. A interface is just a binding a contract, but still, we can use Mockito to mock the interface, and test it.

For example, given the following simple Setter and Getter Interface:

1
2
3
4

interface GetAndSet {
    void setValue(String name);
    String getValue();
}
interface GetAndSet {
    void setValue(String name);
    String getValue();
}

We can test it like this – thanks to the Mockito mocking framework in Java. We use doAnswer method to intercept the invokation of a interface method i.e. setter, then at the time, we mock the getter.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

package com.helloacm;
 
import lombok.val;
import org.junit.jupiter.api.Test;
 
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.*;
 
interface GetAndSet {
    void setValue(String name);
    String getValue();
}
 
public class ExampleTest {
    @Test
    public void test_simple_getter_setter_interface() {
        val instance = mock(GetAndSet.class);
 
        doAnswer(invocation -> {
            // or use invocation.getArgument(0);
            val name = (String)invocation.getArguments()[0];
            when(instance.getValue()).thenReturn(name);
            return null;
        }).when(instance).setValue(anyString());
 
        instance.setValue("HelloACM.com");
        assertEquals("HelloACM.com", instance.getValue());
    }
}
package com.helloacm;

import lombok.val;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.*;

interface GetAndSet {
    void setValue(String name);
    String getValue();
}

public class ExampleTest {
    @Test
    public void test_simple_getter_setter_interface() {
        val instance = mock(GetAndSet.class);

        doAnswer(invocation -> {
            // or use invocation.getArgument(0);
            val name = (String)invocation.getArguments()[0];
            when(instance.getValue()).thenReturn(name);
            return null;
        }).when(instance).setValue(anyString());

        instance.setValue("HelloACM.com");
        assertEquals("HelloACM.com", instance.getValue());
    }
}

If the method we are mocking is not void – we can use when. For example:

1
2
3

when(instance.getValue()).thenAnswer(innocation -> {
     return "Hello";
});
when(instance.getValue()).thenAnswer(innocation -> {
     return "Hello";
});

–EOF (The Ultimate Computing & Technology Blog) —

推荐阅读：
CloudFlare Enterprise Plan Overview　 Powerful Integers by Bruteforce Algorithm using C++　 How to Check if Any Three Points can Make a Triangle?　 How to Convert Set to Vector in C++?　 Peeple App Embodies the Worst of Social Media　 10 Best Writing Quotes for Bloggers　 Will Dorsey be Twitter’s Next CEO?　 How to Use Email Etiquette in the Age of Email Overload　 Welcome to Twitter, Edward Snowden　 Goodbye, Book Clubs: Book Lovers Unite on Social Media　
评论列表
添加评论