Provisioner失敗時にエラーメッセージ出すようにした

lib/tsudura/errors/provisioning_failed.rb

@@ -1,6 +1,9 @@
 module Tsudura
   module Errors
     class ProvisioningFailed < StandardError
+      def message
+        "Provisioning failed. Please check provisioning setting."
+      end
     end
   end
 end

spec/tsudura/runner_spec.rb

@@ -0,0 +1,14 @@
+require File.expand_path(File.join('..', 'spec_helper'), File.dirname(__FILE__))
+
+describe Tsudura::Runner do
+  describe ".run" do
+    context "raise Tsudura::Errors::ProvisioningFailed" do
+      it do
+        allow(Tsudura::Runner).to receive(:run).and_raise(Tsudura::Errors::ProvisioningFailed)
+        expect { Tsudura::Runner.run }.to raise_error(
+          Tsudura::Errors::ProvisioningFailed, "Provisioning failed. Please check provisioning setting."
+        )
+      end
+    end
+  end
+end