@BeforeAll
    public static void beforeAll() throws Exception {
        val key = IOUtils.toString(new ClassPathResource("account-key.json").getInputStream(), StandardCharsets.UTF_8);
        try (val writer = Files.newWriter(
                new File(FileUtils.getTempDirectory(), "account-key.json"), StandardCharsets.UTF_8)) {
            IOUtils.write(key, writer);
            writer.flush();
        }
    }
This is {@link GoogleFirebaseCloudMessagingNotificationSenderTests}.

@author Misagh Moayyed
@since 6.3.0
support/cas-server-support-notifications-fcm/src/test/java/org/apereo/cas/notifications/GoogleFirebaseCloudMessagingNotificationSenderTests.java