diff --git a/src/sections.zig b/src/sections.zig
index d41e794..2c9ffb3 100644
--- a/src/sections.zig
+++ b/src/sections.zig
@@ -258,11 +258,13 @@ test "test corpus" {
     try testing.expectEqualStrings(membersOfAll[0].name, "Name" ** 8);
     try testing.expectEqualStrings(membersOfAll[1].name, "svc-bar");
     try testing.expectEqualStrings(membersOfAll[2].name, "vidmantas");
+    try testing.expectEqual(corpus.groupname2users.get("404"), null);
 
     const groupsOfVidmantas = corpus.username2groups.get("vidmantas").?.items;
     try testing.expectEqual(groupsOfVidmantas[0].gid, 1000);
     try testing.expectEqual(groupsOfVidmantas[1].gid, 1234);
     try testing.expectEqual(groupsOfVidmantas[2].gid, 9999);
+    try testing.expectEqual(corpus.username2groups.get("404"), null);
 }
 
 fn testUser(name: []const u8) User {