java - 任何模拟 Files.write(...) 方法的方法？

Question

我需要有关单元测试用例的帮助。
我想模拟静态方法 write(Path path, byte[] bytes, OpenOption... options)的 java.nio.file.Files类(class)。

我试过例如。以这种方式:

PowerMockito.doReturn(path).when(Files.class, "write", path, someString.getBytes());

在这种情况下，找不到该方法。

PowerMockito.doReturn(path).when(Files.class, PowerMockito.method(Files.class, "write", Path.class, byte[]
            .class, OpenOption.class));

这次我有 UnfinishedStubbingException .

我该怎么做才能正确？

Answer 1

我只有一个写入文件系统的服务，所以我决定只使用 Mockito:

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Matchers.anyVararg;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import org.springframework.test.util.ReflectionTestUtils;

Path mockPath = mock(Path.class);
FileSystem mockFileSystem = mock(FileSystem.class);
FileSystemProvider mockFileSystemProvider = mock(FileSystemProvider.class);
OutputStream mockOutputStream = mock(OutputStream.class);
when(mockPath.getFileSystem()).thenReturn(mockFileSystem);
when(mockFileSystem.provider()).thenReturn(mockFileSystemProvider);
when(mockFileSystemProvider.newOutputStream(any(Path.class), anyVararg())).thenReturn(mockOutputStream);
when(mockFileSystem.getPath(anyString(), anyVararg())).thenReturn(mockPath);

// using Spring helper, but could use Java reflection
ReflectionTestUtils.setField(serviceToTest, "fileSystem", mockFileSystem);

只需确保您的服务执行以下调用:

Path path = fileSystem.getPath("a", "b", "c");
Files.write(path, bytes);