public static Mono<Boolean> deleteFileSilently(Path file) {
        return deleteFileSilently(file, Schedulers.boundedElastic());
    }
@Test
    void deleteFileSilentlyTest() throws IOException {
        StepVerifier.create(deleteFileSilently(null))
            .expectNext(false)
            .verifyComplete();

        StepVerifier.create(deleteFileSilently(tempDirectory))
            .expectNext(false)
            .verifyComplete();

        StepVerifier.create(
                deleteFileSilently(Files.createFile(tempDirectory.resolve("for-deleting"))))
            .expectNext(true)
            .verifyComplete();
    }