How to mock Scanner scanner = new Scanner(file，"UTF-8")在Roboelectric中

import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.shadows.ShadowFile;
import org.robolectric.shadows.ShadowScanner;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;

import static org.junit.Assert.assertEquals;

@RunWith(RobolectricTestRunner.class)
public class ScannerTest {

    @Test
    public void testScannerCreation() throws IOException {
        String fileContent = "Hello World!";
        File file = ShadowFile.newFile("/path/to/file.txt", fileContent.getBytes(StandardCharsets.UTF_8));

        // 模拟创建Scanner对象
        Scanner scanner = new Scanner(file, "UTF-8");
        
        // 使用模拟的Scanner对象读取文件内容
        String content = scanner.nextLine();
        
        assertEquals(fileContent, content);
    }
}