Add tests for #select_backend_config

spec/invoker/power/url_rewriter_spec.rb

@@ -46,6 +46,19 @@
       expect(match[0]).to eq("hello-world")
     end
 
+    it "should match lots of dots" do
+      match = rewriter.extract_host_from_domain("a.b.c.d.dev")
+      expect(match).to_not be_empty
+
+      expect(match[0]).to eq("a.b.c.d")
+      expect(match[1]).to eq("d")
+    end
+
+    it "should not match foo.local" do
+      match = rewriter.extract_host_from_domain("foo.local")
+      expect(match).to be_empty
+    end
+
     context 'user sets up a custom top level domain' do
       before(:all) do
         @original_invoker_config = Invoker.config
@@ -66,5 +79,51 @@
         Invoker.config = @original_invoker_config
       end
     end
+
+    context '#select_backend_config' do
+      before(:all) do
+        @original_invoker_config = Invoker.dns_cache
+        @processes = [
+          { label: 'foo',     port: 1 },
+          { label: 'api.foo', port: 2 },
+          { label: 'bar.foo', port: 3 },
+        ].map{ |p| OpenStruct.new(p) }
+        Invoker.config.stubs(:processes).returns(@processes)
+        Invoker.dns_cache = Invoker::DNSCache.new(nil)
+      end
+
+      before do
+        def rewriter.dns_check(*args)
+          socket = StringIO.new
+          Invoker::IPC::DnsCheckCommand.new(socket).run_command(Invoker::IPC::Message::DnsCheck.new(*args))
+          socket.rewind
+          Invoker::IPC.message_from_io socket
+        end
+      end
+
+      after(:all) do
+        Invoker.dns_cache = @original_invoker_config
+      end
+
+      it 'matches foo.dev' do
+        match = rewriter.select_backend_config('foo.dev')
+        expect(match.port).to eql(1)
+      end
+
+      it 'matches api.foo.dev' do
+        match = rewriter.select_backend_config('api.foo.dev')
+        expect(match.port).to eql(2)
+      end
+
+      it 'matches bar.foo.dev' do
+        match = rewriter.select_backend_config('bar.foo.dev')
+        expect(match.port).to eql(3)
+      end
+
+      it 'matches baz.foo.dev' do
+        match = rewriter.select_backend_config('baz.foo.dev')
+        expect(match.port).to eql(1)
+      end
+    end
   end
 end