1 files changed, 38 insertions, 0 deletions
diff --git a/comm/mailnews/db/msgdb/test/unit/test_mailTelemetry.js b/comm/mailnews/db/msgdb/test/unit/test_mailTelemetry.js
new file mode 100644
index 0000000000..c0bc034bad
--- /dev/null
+++ b/comm/mailnews/db/msgdb/test/unit/test_mailTelemetry.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Test telemetry related to mails read.
+ */
+
+let { TelemetryTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TelemetryTestUtils.sys.mjs"
+);
+
+/**
+ * Check that we're counting mails read.
+ */
+add_task(async function test_mails_read() {
+  Services.telemetry.clearScalars();
+
+  localAccountUtils.loadLocalMailAccount();
+
+  const NUM_MAILS = 5;
+  let headers =
+    "from: alice@t1.example.com\r\n" +
+    "to: bob@t2.example.net\r\n" +
+    "return-path: alice@t1.example.com\r\n" +
+    "Disposition-Notification-To: alice@t1.example.com\r\n";
+  for (let i = 0; i < NUM_MAILS; i++) {
+    localAccountUtils.inboxFolder.addMessage(
+      "From \r\n" + headers + "\r\nhello\r\n"
+    );
+  }
+  localAccountUtils.inboxFolder.markAllMessagesRead(null);
+  const scalars = TelemetryTestUtils.getProcessScalars("parent");
+  Assert.equal(
+    scalars["tb.mails.read"],
+    NUM_MAILS,
+    "Count of mails read must be correct."
+  );
+});