diff --git a/chatmaild/src/chatmaild/metrics.py b/chatmaild/src/chatmaild/metrics.py
index 1d4132a9..e037724e 100644
--- a/chatmaild/src/chatmaild/metrics.py
+++ b/chatmaild/src/chatmaild/metrics.py
@@ -4,14 +4,16 @@ import time
 import sys
 
 
-def main():
-    vmail_dir = sys.argv[1]
+def main(vmail_dir=None):
+    if vmail_dir is None:
+        vmail_dir = sys.argv[1]
+
     accounts = 0
     ci_accounts = 0
 
     for path in Path(vmail_dir).iterdir():
         accounts += 1
-        if path.name.startswith("ci-"):
+        if path.name[:3] in ("ci-", "ac_"):
             ci_accounts += 1
 
     timestamp = int(time.time() * 1000)
diff --git a/chatmaild/src/chatmaild/tests/test_metrics.py b/chatmaild/src/chatmaild/tests/test_metrics.py
new file mode 100644
index 00000000..c48c4a77
--- /dev/null
+++ b/chatmaild/src/chatmaild/tests/test_metrics.py
@@ -0,0 +1,16 @@
+from chatmaild.metrics import main
+
+
+def test_main(tmp_path, capsys):
+    for x in ("ci-asllkj", "ac_12l3kj", "qweqwe", "ci-l1k2j31l2k3"):
+        tmp_path.joinpath(x).mkdir()
+    main(tmp_path)
+    out, _ = capsys.readouterr()
+    d = {}
+    for line in out.split("\n"):
+        if line.strip():
+            name, num, _ = line.split()
+            d[name] = int(num)
+
+    assert d["accounts"] == 4
+    assert d["ci_accounts"] == 3