無法在javavoid方法中使用mkdirs()呼叫模擬創建目錄

在嘗試為以下代碼運行我的測驗時。我在下面詳細介紹了一些錯誤。

當我嘗試運行我的測驗時，我觀察到它mkdirs()在我的代碼中引發呼叫。IllegalArgumentException

MyClass.java

package com.javaeasily.demos.junit;

import java.util.ArrayList;

public class MyClass {
    private final NodeHelper nodeHelper;
    private static final ArrayList<String> ACTIVE_SERVICES_POST_RECONFIGURE = new ArrayList<>();

    // Only allow construction if number is greater than one
    MyClass() {
        ACTIVE_SERVICES_POST_RECONFIGURE.add("my-node-"   NodeUtils.getMyNode());
        nodeHelper = new NodeHelper();
    }

    public void reconfigureNode() {
        if (ACTIVE_SERVICES_POST_RECONFIGURE.isEmpty()) {
            return;
        }
        try {
            nodeHelper.createStagingDir();
        } catch (Exception e) {
            throw new RuntimeException("Cannot reconfigure node");
        }
    }
}

NodeUtils.java

package com.javaeasily.demos.junit;


import org.apache.commons.lang3.StringUtils;

public class NodeUtils {
    private static final String HOSTNAME_PREFIX = "my-node-";

    public static String hostnameToNode(String hostname) {
        if (!hostname.startsWith(HOSTNAME_PREFIX)) {
            throw new IllegalArgumentException(hostname   " is not recognized hostname");
        }
        return StringUtils.removeStart(hostname, HOSTNAME_PREFIX);
    }

    public static String getHostname() {
        return System.getenv("HOSTNAME");
    }

    public static String getMyNode() {
        return hostnameToNode(getHostname());
    }
}

節點助手.java

package com.javaeasily.demos.junit;

import java.io.File;

public class NodeHelper {
    private static final String STAGING_DIR = "/staging/";

    public void createStagingDir() {
        File stagingDir = new File(STAGING_DIR);
        if (!stagingDir.exists() && !stagingDir.mkdirs()) {
            throw new IllegalArgumentException("Could not create staging dir");
        }
    }
}

MyClassTest.java

package com.javaeasily.demos.junit;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.MockedStatic;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
public class MyClassTest {
    private MyClass myclass;

    @BeforeEach
    public void SetUp() {
        try (MockedStatic<NodeUtils> nodeUtilsMockedStatic = Mockito.mockStatic(NodeUtils.class);) {
            nodeUtilsMockedStatic.when(NodeUtils::getMyNode).thenReturn("foo");
            myclass = new MyClass();
        }
    }

    @Test
    public void testReconfigureNode() {
        myclass.reconfigureNode();
    }
}

當我嘗試運行測驗時，出現以下錯誤：

java.lang.RuntimeException: Cannot reconfigure node

    at com.javaeasily.demos.junit.MyClass.reconfigureNode(MyClass.java:22)

除錯后我看到：

java.lang.IllegalArgumentException: Could not create staging dir

有人愿意告訴我我做錯了什么嗎？

uj5u.com熱心網友回復：

要模擬NodeHelper，您不應該在內部創建它MyClass，而是通過建構式從外部注入它。IE

MyClass(Nodehelper nodeHelper) {
    ACTIVE_SERVICES_POST_RECONFIGURE.add("my-node-"   NodeUtils.getMyNode());
    this.nodeHelper = nodeHelper;
}

這允許您NodeHelper在測驗中創建一個模擬，將其傳遞給MyClass并將所需的行為設定為預期。

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