为什么我在这里得到 UnfinishedStubbingException？

Question

测试代码为：

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.time.LocalTime;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import org.junit.runner.RunWith;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
public class HelloWorldByHour {

    private static LocalTime REST_START_TIME = LocalTime.of(14, 0);
    private static LocalTime REST_END_TIME = LocalTime.of(16, 0);

    public static void main(String[] args) throws Exception {
        HttpServer server = HttpServer.create(new InetSocketAddress(8080), 0);
        server.createContext("/greeting", new MyHandler());
        server.setExecutor(null); // creates a default executor
        server.start();
    }

    private static class MyHandler implements HttpHandler {
        public void handle(HttpExchange t) throws IOException {
            LocalTime time = LocalTime.now();
            String response;

            if (time.isAfter(REST_START_TIME) && time.isBefore(REST_END_TIME)) {
                response = "Nap time";
            } else {
                response = "Hello World";
            }

            t.sendResponseHeaders(200, response.length());
            OutputStream os = t.getResponseBody();
            os.write(response.getBytes());
            os.close();
        }
    }

}

当运行我得到的测试：

org.mockito.exceptions.misusing.UnfinishedStubbingException: Unfinished stubbing detected here: -> at HelloWorldByHourTest.testMain(HelloWorldByHourTest.java:35)

E.g. thenReturn() may be missing. Examples of correct stubbing: when(mock.isOk()).thenReturn(true); when(mock.isOk()).thenThrow(exception); doThrow(exception).when(mock).someVoidMethod(); Hints: 1. missing thenReturn() 2. you are trying to stub a final method, you naughty developer! 3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed

我的pom.xml是

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>server</groupId>
    <artifactId>server</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>(whatever version is current)</version>
                <configuration>
                    <!-- or whatever version you use -->
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito</artifactId>
            <version>1.6.5</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-core</artifactId>
            <version>1.6.5</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>1.6.5</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
    </dependencies>
</project>

测试代码为：

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.time.LocalTime;

import static org.powermock.api.mockito.PowerMockito.mockStatic;
import static org.powermock.api.mockito.PowerMockito.when;

@RunWith(PowerMockRunner.class)
@PrepareForTest(LocalTime.class)
public class HelloWorldByHourTest {

    private String sendRequest() throws IOException {
        URL url = new URL("localhost:8080/greeting");
        BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
        String strTemp = "";
        StringBuilder sb = new StringBuilder();
        while (null != (strTemp = br.readLine())) {
            sb.append(strTemp);
        }
        return sb.toString();
    }

    @Test
    public void testMain() throws Exception {

        mockStatic(LocalTime.class);
        when(LocalTime.now()).thenReturn(LocalTime.of(15, 0));
        HelloWorldByHour.main(null);
        String response = sendRequest();
        Assert.assertEquals("Nap time", response);
    }
}

知道哪里出了问题吗？

Answer 1

问题是您在 when 和 thenReturn

中对 LocalDate 调用了静态方法

尝试这样的事情：

    LocalTime time = LocalTime.of(15,0);
    mockStatic(LocalTime.class);
    when(LocalTime.now()).thenReturn(time);

Answer 2

通过此电话 when(LocalTime.now()).thenReturn(LocalTime.of(15, 0)); 您比较适合：

3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed.

基本上你已经静态地模拟了 LocalTime class 但你也在调用静态 LocalTime.of(15, 0) 方法同时定义 LocalTime.now().

根据你想做什么，我想一个解决方法是在模拟静态方法之前创建一个 LocalTime 的模拟，类似于：

@Test
public void testMain() throws Exception {
    // create a mock
    LocalTime mockLocalTime = mock(LocalTime.class);
    // TODO define behaviour of mockLocalTime

    // mock the static methods
    mockStatic(LocalTime.class);
    when(LocalTime.now()).thenReturn(mockLocalTime);

    // invoke object under test
    HelloWorldByHour.main(null);
    String response = sendRequest();

    // interaction verification and/or assersions
    Assert.assertEquals("Nap time", response);
}

为什么我在这里得到 UnfinishedStubbingException？

Why do I get UnfinishedStubbingException here?

java

junit

unit-testing

maven

powermockito