build ip updating logic, own dyn dns

spec/jobs/dns_update_job_spec.rb

@@ -1,5 +1,30 @@
 require 'rails_helper'
 
 RSpec.describe DnsUpdateJob, type: :job do
-  pending "add some examples to (or delete) #{__FILE__}"
+  ActiveJob::Base.queue_adapter = :test
+  let(:my_ip){"85.76.133.88"}
+
+  it "should get ip" do
+    res = DnsUpdateJob.new.my_ip
+    expect(res).to eq my_ip
+  end
+
+  it "should init client" do
+    client = DnsUpdateJob.new.client
+    expect(client.class).to be Dnsimple::Client
+  end
+
+  it "should find domain" do
+    zone = DnsUpdateJob.new.find_record("gateway","hubfeenix.fi")
+    expect(zone.class).to eq Dnsimple::Struct::ZoneRecord
+    expect(zone.name).to eq "gateway"
+    expect(zone.content).to eq my_ip
+  end
+
+  it "update ip" do
+    updater = DnsUpdateJob.new
+    updater.update_ip
+    zone = updater.find_record("gateway","hubfeenix.fi")
+    expect(zone.content).to eq my_ip
+  end
 end