Convert spec to test

#661

spec/models/nameserver_spec.rb

@@ -1,13 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Nameserver do
-  describe '::hostnames', db: false do
-    before :example do
-      expect(described_class).to receive(:pluck).with(:hostname).and_return('hostnames')
-    end
-
-    it 'returns names' do
-      expect(described_class.hostnames).to eq('hostnames')
-    end
-  end
-end

test/fixtures/nameservers.yml

@@ -1,3 +1,15 @@
 ns1:
   hostname: ns1.bestnames.test
+  ipv4:
+    - 192.0.2.1
+  ipv6:
+    - 2001:DB8::1
+  domain: shop
+
+ns2:
+  hostname: ns2.bestnames.test
+  ipv4:
+    - 192.0.2.2
+  ipv6:
+    - 2001:DB8::2
   domain: shop

test/models/nameserver_test.rb

@@ -20,4 +20,8 @@ class NameserverTest < ActiveSupport::TestCase
     @nameserver.validate
     assert @nameserver.invalid?
   end
+
+  def test_hostnames
+    assert_equal %w[ns1.bestnames.test ns2.bestnames.test], Nameserver.hostnames
+  end
 end