Asserting file content with AssertJ

FileTest.java

import java.io.File;
import org.junit.Test;

import static org.assertj.core.api.Assertions.*;

public class FileTest {

    @Test
    public void file() {
        File actualFile = new File("actual.txt");
        File expectedFile = new File("expected.txt");
        assertThat(actualFile).hasContentEqualTo(expectedFile);
    }

    @Test
    public void inline() {
        File actualFile = new File("actual.txt");
        assertThat(linesOf(actualFile)).containsExactly(
                "line 1",
                "line 2",
                "line 3"
        );
    }
}