模拟文件类和 NullPointerException
我正在使用 Mockito 创建一个文件模拟对象，该对象将用作存储新文件的目录。
Folder folder = Mockito.mock(File.class);
File file = new Agent().createNewFile(folder, "fileName");
在我的 Agent 类中：
public File createNewFile(File folder, String filename){
return new File(folder, "testfile");
}
但是在 createNewFile 方法中创建新文件时，我在 File 的初始化块处收到 NullPointerException：
java.lang.NullPointerException at java.io.File.<init>(File.java:308)
我认为发生这种情况是因为 File 没有任何空构造函数，所以当模拟对象时，某些内部状态保持为空。
我是否采用了错误的方法来模拟 Filefolder 对象？我的目标是在创建新文件之前检查一些约束，但我不想依赖文件系统上现有的真实文件夹。
谢谢。
I'm creating a File mock object with Mockito that will be used as the directory to store a new File.
Folder folder = Mockito.mock(File.class);
File file = new Agent().createNewFile(folder, "fileName");
and inside my Agent class:
public File createNewFile(File folder, String filename){
return new File(folder, "testfile");
}
But I'm getting a NullPointerException at the initialization block of File when creating the new file inside createNewFile method:
java.lang.NullPointerException at java.io.File.<init>(File.java:308)
I think it happens because File doesn't have any empty constructor, so when mocking the object some internal state remains null.
Am I taking the wrong approach mocking the File folder object? My goal is to check some constraints before creating the new file, but I don't want to depend on an existing real folder on the file system.
Thank you.
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您需要定义文件夹的 getPath() 行为，因为它在 File 类中内部调用。
您可以这样做：
它只会在您没有真正创建新文件而仅调用 new File 时才起作用。
You need to define the behavior for getPath() for folder as it gets called internally in File class.
You can do it as:
It will work only till you don't really create a new file but only calling new File.