如何使用Mock()测试这些文件i/o方法？使用groovy和spock

import spock.lang.Specification
import spock.mock.Mock
import java.nio.file.Files
import java.nio.file.Path
import java.nio.file.StandardOpenOption

class FileIOTest extends Specification {
    // 在测试中使用@Mock注解来创建一个模拟对象
    @Mock
    Path mockFilePath

    def setup() {
        // 在setup()方法中设置模拟对象的行为
        // 例如，当调用mockFilePath.toFile()时，返回一个模拟的文件对象
        mockFilePath.toFile() >> new File("mockFile.txt")
    }

    def "test file read"() {
        given:
        def fileIO = new FileIO()

        when:
        def result = fileIO.readFile(mockFilePath)

        then:
        result == "Mocked file content"
    }

    def "test file write"() {
        given:
        def fileIO = new FileIO()

        when:
        fileIO.writeFile(mockFilePath, "Mocked file content")

        then:
        1 * mockFilePath.toFile()
        1 * mockFilePath.toFile().newOutputStream(_ as StandardOpenOption[])
        1 * mockFilePath.toFile().newOutputStream(_ as StandardOpenOption[]).write(_ as byte[])
    }
}

import java.nio.file.Path

class FileIO {
    String readFile(Path filePath) {
        // 读取文件的逻辑
        // 返回文件内容
    }

    void writeFile(Path filePath, String content) {
        // 写入文件的逻辑
    }
}