diff --git a/spec/fabricators/zonefile_setting_fabricator.rb b/spec/fabricators/zonefile_setting_fabricator.rb
new file mode 100644
index 000000000..b8b04513a
--- /dev/null
+++ b/spec/fabricators/zonefile_setting_fabricator.rb
@@ -0,0 +1,10 @@
+Fabricator(:zonefile_setting) do
+  origin 'ee'
+  ttl 43200
+  refresh 3600
+  expire 1209600
+  minimum_ttl 3600
+  email 'hostmaster.eestiinternet.ee'
+  master_nameserver 'ns.tld.ee'
+  after_build { |x| x.retry = 900 }
+end
diff --git a/spec/models/zonefile_setting_spec.rb b/spec/models/zonefile_setting_spec.rb
index c8909f2eb..5ac895a8e 100644
--- a/spec/models/zonefile_setting_spec.rb
+++ b/spec/models/zonefile_setting_spec.rb
@@ -49,4 +49,34 @@ describe ZonefileSetting do
 
     @zonefile.scan(/^#{d.name}/).count.should == 0
   end
+
+  it 'does not create duplicate zones' do
+    Fabricate(:zonefile_setting)
+    expect { Fabricate(:zonefile_setting) }.to raise_error(ActiveRecord::RecordInvalid)
+  end
+
+  it 'does not allow deleting zone when it has existing domains' do
+    zs = ZonefileSetting.where({
+      origin: 'ee',
+      ttl: 43200,
+      refresh: 3600,
+      retry: 900,
+      expire: 1209600,
+      minimum_ttl: 3600,
+      email: 'hostmaster.eestiinternet.ee',
+      master_nameserver: 'ns.tld.ee'
+    }).first_or_create!
+
+    d = Fabricate(:domain)
+
+    zs.destroy.should == false
+
+    zs.errors.full_messages.should match_array(["There are 1 domains in this zone"])
+    ZonefileSetting.count.should == 1
+
+    d.destroy
+    zs.destroy
+
+    ZonefileSetting.count.should == 0
+  end
 end