diff --git a/certbot-apache/certbot_apache/tests/constants_test.py b/certbot-apache/certbot_apache/tests/constants_test.py
index c040030df..1c842aee9 100644
--- a/certbot-apache/certbot_apache/tests/constants_test.py
+++ b/certbot-apache/certbot_apache/tests/constants_test.py
@@ -25,3 +25,20 @@ class ConstantsTest(unittest.TestCase):
         os_info.return_value = ('Nonexistent Linux', '', '')
         self.assertEqual(constants.os_constant("vhost_root"),
                          "/etc/apache2/sites-available")
+
+    @mock.patch("certbot.util.get_os_info")
+    def test_get_default_constants(self, os_info):
+        os_info.return_value = ('Nonexistent Linux', '', '')
+        with mock.patch("certbot.util.get_systemd_os_like") as os_like:
+            # Get defaults
+            os_like.return_value = False
+            c_hm = constants.os_constant("handle_mods")
+            c_sr = constants.os_constant("server_root")
+            self.assertFalse(c_hm)
+            self.assertEqual(c_sr, "/etc/apache2")
+            # Use darwin as like test target
+            os_like.return_value = ["something", "nonexistent", "darwin"]
+            d_vr = constants.os_constant("vhost_root")
+            d_em = constants.os_constant("enmod")
+            self.assertFalse(d_em)
+            self.assertEqual(d_vr, "/etc/apache2/other")
diff --git a/certbot/tests/testdata/os-release b/certbot/tests/testdata/os-release
index cd5297acf..15bc5fb3c 100644
--- a/certbot/tests/testdata/os-release
+++ b/certbot/tests/testdata/os-release
@@ -1,7 +1,7 @@
 NAME="SystemdOS"
 VERSION="42.42.42 LTS, Unreal"
 ID=systemdos
-ID_LIKE=debian
+ID_LIKE="something nonexistent debian"
 VERSION_ID="42"
 HOME_URL="http://www.example.com/"
 SUPPORT_URL="http://help.example.com/"
diff --git a/certbot/tests/util_test.py b/certbot/tests/util_test.py
index 8e1b330ed..36676443a 100644
--- a/certbot/tests/util_test.py
+++ b/certbot/tests/util_test.py
@@ -359,6 +359,15 @@ class OsInfoTest(unittest.TestCase):
         with mock.patch('os.path.isfile', return_value=False):
             self.assertEqual(get_systemd_os_info(), ("", ""))
 
+    def test_systemd_os_release_like(self):
+        from certbot.util import get_systemd_os_like
+
+        with mock.patch('os.path.isfile', return_value=True):
+            id_likes = get_systemd_os_like(test_util.vector_path(
+                "os-release"))
+            self.assertEqual(len(id_likes), 3)
+            self.assertTrue("debian" in id_likes)
+
     @mock.patch("certbot.util.subprocess.Popen")
     def test_non_systemd_os_info(self, popen_mock):
         from certbot.util import (get_os_info, get_python_os_info,