Entrypoint specs.

entrypoint.sh

@@ -10,7 +10,7 @@ if !ENV["GITHUB_TOKEN"]
   exit(1)
 end
 
-if ARGV[0]&.empty?
+if ARGV[0].nil? || ARGV[0].empty?
   puts "Missing message argument."
   exit(1)
 end

spec/commenter_spec.rb

@@ -1,6 +1,6 @@
-  require "spec_helper"
+require "spec_helper"
 
-  RSpec.describe Commenter do
+RSpec.describe Commenter do
   let(:github) do
     spy("GitHub", comments: [
       { "body" => "Oh, hi! I didn't see you there." },
@@ -82,4 +82,4 @@
     end
   end
 
-  end
+end

spec/entrypoint_spec.rb

@@ -0,0 +1,28 @@
+require "spec_helper"
+
+RSpec.describe "entrypoint.sh" do
+
+  def run_script(env = {}, args = [])
+    path = File.join(__dir__, "../entrypoint.sh")
+    Open3.capture3(env, path, *args)
+  end
+
+  let(:base_env) do
+    {
+      "GITHUB_TOKEN" => "secret",
+      "GITHUB_EVENT_PATH" => File.join(__dir__, "event.json")
+    }
+  end
+
+  it "fails without GITHUB_TOKEN" do
+    out, err, status = run_script
+    expect(out).to eq "Missing GITHUB_TOKEN\n"
+    expect(status.success?).to eq false
+  end
+
+  it "fails without message" do
+    out, err, status = run_script(base_env)
+    expect(out).to eq "Missing message argument.\n"
+    expect(status.success?).to eq false
+  end
+end

spec/event.json

@@ -0,0 +1,5 @@
+{
+  "respository": {
+    "full_name": "foo/bar"
+  }
+}

spec/spec_helper.rb

@@ -1,4 +1,5 @@
 require "json"
 require "octokit"
+require "open3"
 require_relative "../lib/github"
 require_relative "../lib/commenter"