Add more tests

spec/pigeon/message_spec.rb

@@ -1,26 +1,33 @@
 require "spec_helper"
 
 RSpec.describe Pigeon::Message do
-  it "signs a message" do
+  let(:message) do
     message = Pigeon::Message.create(kind: "unit_test")
     hash = Pigeon::Storage.current.set_blob(File.read("./logo.png"))
-    expectations = {
-      author: Pigeon::KeyPair.current.public_key,
-      kind: "unit_test",
-      body: {
-        "a" => "bar".to_json,
-        "b" => hash,
-      },
-      depth: 0,
-      prev: Pigeon::Message::EMPTY_MESSAGE,
-    }
     message.append("a", "bar")
     message.append("b", hash)
     message.sign
+    message
+  end
+  it "signs a message" do
+    test_me = message
     raise "need better assertions!"
   end
+  MSG = ["author @CXOkNU2zetuk0g30KqLsWxEMdJC0r_0wVe6syzjYGn0=.ed25519",
+         "kind unit_test",
+         "prev NONE",
+         "depth 0",
+         "\n",
+         "a:\"bar\"",
+         "b:&6462a5f5174b53702fc25afe67a8f9a29f572610a65bafefff627531552f096f.sha256",
+         "\n",
+         "signature ZZesWjxcHY22oi6GCjWSSXs-avks6E3ijHwJJJJd04WkmJIMMIKZamIw85fr4LnWydhfRML_HUW2nQxPDeCEBQ==.sig.ed25519 "].join
+
+  it "renders a first message" do
+    expect(message.render).to eq(MSG)
+    raise "Now attach a second message and make sure that it renders correctly"
+  end
 
-  it "renders a message"
   it "creates a new message" do
     message = Pigeon::Message.create(kind: "unit_test")
     hash = Pigeon::Storage.current.set_blob(File.read("./logo.png"))