1 files changed, 48 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/tests/unit/test_TelemetryScalars_impressionId.js b/toolkit/components/telemetry/tests/unit/test_TelemetryScalars_impressionId.js
new file mode 100644
index 0000000000..8717d34501
--- /dev/null
+++ b/toolkit/components/telemetry/tests/unit/test_TelemetryScalars_impressionId.js
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/
+*/
+
+const CATEGORY = "telemetry.test";
+const MAIN_ONLY = `${CATEGORY}.main_only`;
+const IMPRESSION_ID_ONLY = `${CATEGORY}.impression_id_only`;
+
+add_task(async function test_multistore_basics() {
+  Telemetry.clearScalars();
+
+  const expectedUint = 3785;
+  const expectedString = "{some_impression_id}";
+  Telemetry.scalarSet(MAIN_ONLY, expectedUint);
+  Telemetry.scalarSet(IMPRESSION_ID_ONLY, expectedString);
+
+  const mainScalars = Telemetry.getSnapshotForScalars("main").parent;
+  const impressionIdScalars =
+    Telemetry.getSnapshotForScalars("deletion-request").parent;
+
+  Assert.ok(
+    MAIN_ONLY in mainScalars,
+    `Main-store scalar ${MAIN_ONLY} must be in main snapshot.`
+  );
+  Assert.ok(
+    !(MAIN_ONLY in impressionIdScalars),
+    `Main-store scalar ${MAIN_ONLY} must not be in deletion-request snapshot.`
+  );
+  Assert.equal(
+    mainScalars[MAIN_ONLY],
+    expectedUint,
+    `Main-store scalar ${MAIN_ONLY} must have correct value.`
+  );
+
+  Assert.ok(
+    IMPRESSION_ID_ONLY in impressionIdScalars,
+    `Deletion-request store scalar ${IMPRESSION_ID_ONLY} must be in deletion-request snapshot.`
+  );
+  Assert.ok(
+    !(IMPRESSION_ID_ONLY in mainScalars),
+    `Deletion-request scalar ${IMPRESSION_ID_ONLY} must not be in main snapshot.`
+  );
+  Assert.equal(
+    impressionIdScalars[IMPRESSION_ID_ONLY],
+    expectedString,
+    `Deletion-request store scalar ${IMPRESSION_ID_ONLY} must have correct value.`
+  );
+});