Use API hostname and not hardcoded value

lib/brightbox-cli/servers.rb

@@ -45,7 +45,7 @@ def attributes
       a[:status] = fog_model.state
       a[:locked] = locked?
       a[:zone] = zone && zone["handle"]
-      a[:hostname] = id
+      a[:hostname] = hostname
       a[:public_hostname] = "public.#{fqdn}" unless cloud_ips.empty?
       a[:ipv6_hostname] = ipv6_fqdn if interfaces.any? { |i| i["ipv6_address"] }
       a

spec/unit/brightbox/server/hostname_spec.rb

@@ -0,0 +1,27 @@
+require "spec_helper"
+require "fog/brightbox/models/compute/server"
+
+RSpec.describe Brightbox::Server, "#hostname" do
+  let(:fog_model) { Fog::Brightbox::Compute::Server.new(fog_settings) }
+  let(:server) { described_class.new(fog_model) }
+
+  context "when hostname is not equal to id" do
+    let(:fog_settings) do
+      {
+        id: "srv-12345",
+        cloud_ips: [],
+        hostname: "server-hostname",
+        image_id: "img-12345",
+        interfaces: [],
+        server_type: "typ-12345"
+      }
+    end
+
+    it "returns the hostname" do
+      expect(server.attributes[:id]).to eq("srv-12345")
+      expect(server.attributes[:hostname]).to eq("server-hostname")
+
+      expect(server.hostname).to eq("server-hostname")
+    end
+  end
+end