diff --git a/test/domain_test.rb b/test/domain_test.rb
index 8ddf72c..4565d6c 100644
--- a/test/domain_test.rb
+++ b/test/domain_test.rb
@@ -219,3 +219,80 @@ def test_membership_for_posixGroups
       "Expected `#{@cn}` to not include the member `#{user.dn}`"
   end
 end
+
+class GitHubLdapOpenTest < GitHub::Ldap::Test
+  def setup
+    @ldap = GitHub::Ldap.new(options)
+    @domain = @ldap.domain("dc=github,dc=com")
+    @dn = "cn=nested-groups,ou=Groups,dc=github,dc=com"
+    @groups = ["nested-group1", "nested-group2"]
+  end
+
+  def test_membership_for_first_nested_group
+    assert user = @ldap.domain('uid=user1,ou=People,dc=github,dc=com').bind
+
+    assert @domain.is_member?(user, @groups)
+
+    @ldap.open do
+      assert @domain.is_member?(user, @groups)
+    end
+  end
+
+  def test_membership_for_last_nested_group
+    assert user = @ldap.domain('uid=user10,ou=People,dc=github,dc=com').bind
+
+    assert @domain.is_member?(user, @groups)
+
+    @ldap.open do
+      assert @domain.is_member?(user, @groups)
+    end
+  end
+
+  def test_members_match_when_open_and_close
+    members_close = @ldap.group(@dn).members.map(&:uid).flatten
+
+    members_open =
+      @ldap.open do
+        @ldap.group(@dn).members.map(&:uid).flatten
+      end
+
+    assert_equal members_close, members_open
+  end
+
+  def test_open_with_subsearches
+    base   = "dc=github,dc=com"
+    filter = "(|(cn=nested-group1)(cn=nested-group2))"
+
+    close_results = {}
+    @ldap.search(filter: filter, base: base) do |entry|
+      close_results[entry.dn] = []
+      entry['member'].each do |child_dn|
+        @ldap.search(base: child_dn, scope: Net::LDAP::SearchScope_BaseObject) do |child|
+          close_results[entry.dn] << child.dn
+        end
+      end
+    end
+
+    open_results = {}
+    @ldap.open do
+      @ldap.search(filter: filter, base: base) do |entry|
+        open_results[entry.dn] = []
+        entry['member'].each do |child_dn|
+          @ldap.search(base: child_dn, scope: Net::LDAP::SearchScope_BaseObject) do |child|
+            open_results[entry.dn] << child.dn
+          end
+        end
+      end
+    end
+
+    if ENV.fetch('VERBOSE', '0') == '1'
+      require 'pp'
+      puts
+      pp close_results
+      puts "******"
+      pp open_results
+    end
+
+    assert_equal close_results, open_results
+  end
+end
diff --git a/test/fixtures/common/seed.ldif b/test/fixtures/common/seed.ldif
index 29284bb..cc5c3dc 100644
--- a/test/fixtures/common/seed.ldif
+++ b/test/fixtures/common/seed.ldif
@@ -226,6 +226,10 @@ member: uid=user2,ou=People,dc=github,dc=com
 member: uid=user3,ou=People,dc=github,dc=com
 member: uid=user4,ou=People,dc=github,dc=com
 member: uid=user5,ou=People,dc=github,dc=com
+
+dn: cn=nested-group2,ou=Groups,dc=github,dc=com
+cn: nested-group2
+objectClass: groupOfNames
 member: uid=user6,ou=People,dc=github,dc=com
 member: uid=user7,ou=People,dc=github,dc=com
 member: uid=user8,ou=People,dc=github,dc=com
@@ -236,6 +240,7 @@ dn: cn=nested-groups,ou=Groups,dc=github,dc=com
 cn: nested-groups
 objectClass: groupOfNames
 member: cn=nested-group1,ou=Groups,dc=github,dc=com
+member: cn=nested-group2,ou=Groups,dc=github,dc=com
 
 dn: cn=n-member-nested-group1,ou=Groups,dc=github,dc=com
 cn: n-member-nested-group1