public String toString() {
        return getFilePaths() == null || getFilePaths().length == 0
                ? "File Input (unknown file)"
                : "File Input (" + Arrays.toString(this.getFilePaths()) + ')';
    }
@Test
    void testToStringWithoutPathSet() {
        final DummyFileInputFormat format = new DummyFileInputFormat();
        assertThat(format.toString())
                .as("The toString() should be correct.")
                .isEqualTo("File Input (unknown file)");
    }