add unit specs for router

spec/unit/router/call_spec.rb

@@ -0,0 +1,42 @@
+require 'spec_helper'
+
+describe Zero::Router, '#call' do
+  subject { Zero::Router.new(routes) }
+  let(:result) { ['success'] }
+
+  let(:wrong_app) do
+    lambda {|env| [200, {'Content-Type' => 'text/html'}, 'Wrong'] }
+  end
+  let(:app) { SpecApp }
+
+  shared_examples_for "a sample app" do
+    it "returns a response" do
+      subject.call(env).to_a[2].should eq(result)
+    end
+  end
+
+  context "with a single route" do
+    let(:routes) {{ '/' => app }}
+    let(:env) { EnvGenerator.get('/') }
+    it_behaves_like "a sample app"
+  end
+
+  context "with multiple routes" do
+    let(:routes) {{ '/foo' => app, '/wrong' => wrong_app }}
+    let(:env) { EnvGenerator.get('/foo') }
+    it_behaves_like "a sample app"
+  end
+
+  context "with nested routes" do
+    let(:routes) {{ '/' => wrong_app, '/foo' => app, '/foo/bar' => wrong_app }}
+    let(:env) { EnvGenerator.get('/foo') }
+    it_behaves_like "a sample app"
+  end
+
+  context "with a route not found" do
+    let(:routes) {{ '/foo' => wrong_app, '/foo/bar/baz' => app }}
+    let(:env) { EnvGenerator.get('/foo/bar') }
+    let(:result) { ['Not found!'] }
+    it_behaves_like "a sample app"
+  end
+end