private static void deleteJsonFile() {
        val file = new File(FileUtils.getTempDirectory(), "trusted-device.json");
        if (file.exists()) {
            FileUtils.deleteQuietly(file);
        }
    }
Cleanup json file before and after test, quietly because of errors on Windows.
support/cas-server-support-trusted-mfa/src/test/java/org/apereo/cas/trusted/authentication/storage/JsonMultifactorAuthenticationTrustStorageTests.java