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diff --git a/third_party/rust/glean/tests/init_fails.rs b/third_party/rust/glean/tests/init_fails.rs
new file mode 100644
index 0000000000..ccd4c2e3a8
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+++ b/third_party/rust/glean/tests/init_fails.rs
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+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//! This integration test should model how the RLB is used when embedded in another Rust application
+//! (e.g. FOG/Firefox Desktop).
+//!
+//! We write a single test scenario per file to avoid any state keeping across runs
+//! (different files run as different processes).
+
+mod common;
+
+use std::{thread, time::Duration};
+
+use glean::Configuration;
+
+/// Some user metrics.
+mod metrics {
+    use glean::private::*;
+    use glean::{Lifetime, TimeUnit};
+    use glean_core::CommonMetricData;
+    use once_cell::sync::Lazy;
+
+    #[allow(non_upper_case_globals)]
+    pub static initialization: Lazy<TimespanMetric> = Lazy::new(|| {
+        TimespanMetric::new(
+            CommonMetricData {
+                name: "initialization".into(),
+                category: "sample".into(),
+                send_in_pings: vec!["validation".into()],
+                lifetime: Lifetime::Ping,
+                disabled: false,
+                ..Default::default()
+            },
+            TimeUnit::Nanosecond,
+        )
+    });
+}
+
+mod pings {
+    use glean::private::PingType;
+    use once_cell::sync::Lazy;
+
+    #[allow(non_upper_case_globals)]
+    pub static validation: Lazy<PingType> =
+        Lazy::new(|| glean::private::PingType::new("validation", true, true, vec![]));
+}
+
+/// Test scenario: Glean initialization fails.
+///
+/// App tries to initialize Glean, but that somehow fails.
+#[test]
+fn init_fails() {
+    common::enable_test_logging();
+
+    metrics::initialization.start();
+
+    // Create a custom configuration to use a validating uploader.
+    let dir = tempfile::tempdir().unwrap();
+    let tmpname = dir.path().display().to_string();
+
+    let cfg = Configuration {
+        data_path: tmpname,
+        application_id: "".into(), // An empty application ID is invalid.
+        upload_enabled: true,
+        max_events: None,
+        delay_ping_lifetime_io: false,
+        channel: Some("testing".into()),
+        server_endpoint: Some("invalid-test-host".into()),
+        uploader: None,
+    };
+    common::initialize(cfg);
+
+    metrics::initialization.stop();
+
+    pings::validation.submit(None);
+
+    // We don't test for data here, as that would block on the dispatcher.
+
+    // Give it a short amount of time to actually finish initialization.
+    thread::sleep(Duration::from_millis(500));
+
+    glean::shutdown();
+}