Refs #5669; Add a preview for snapshots for easier debugging

5 files changed, 72 insertions, 1 deletions

diff --git a/app/controllers/snapshots_controller.rb b/app/controllers/snapshots_controller.rb
new file mode 100644
index 000000000..e453b4965
--- /dev/null
+++ b/app/controllers/snapshots_controller.rb
@@ -0,0 +1,14 @@
+class SnapshotsController < ApplicationController
+  if Rails.env.development? || Rails.env.test?
+    layout :which_layout
+    def show
+      tpl = params[:snap]
+      tpl = tpl.gsub Rails.root.to_s, ''
+      render file: tpl
+    end
+
+    def which_layout
+      "snapshots/#{params[:layout] || "default"}"
+    end
+  end
+end
diff --git a/app/views/layouts/snapshots/actions_links.html.slim b/app/views/layouts/snapshots/actions_links.html.slim
new file mode 100644
index 000000000..f1fa55e87
--- /dev/null
+++ b/app/views/layouts/snapshots/actions_links.html.slim
@@ -0,0 +1,21 @@
+doctype html
+html lang=I18n.locale
+  head
+    meta charset="utf-8"
+    meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
+
+    = csrf_meta_tag
+
+    title = t('brandname')
+
+    = stylesheet_link_tag 'base'
+    = stylesheet_link_tag 'application'
+
+    = javascript_pack_tag 'application'
+    = javascript_include_tag 'application'
+
+  body
+    = render 'layouts/navigation/main_nav'
+    = render 'layouts/flash_messages', flash: flash
+    div.page_header
+      = yield
diff --git a/app/views/layouts/snapshots/default.html.slim b/app/views/layouts/snapshots/default.html.slim
new file mode 100644
index 000000000..9e4565dcb
--- /dev/null
+++ b/app/views/layouts/snapshots/default.html.slim
@@ -0,0 +1,19 @@
+doctype html
+html lang=I18n.locale
+  head
+    meta charset="utf-8"
+    meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
+
+    = csrf_meta_tag
+
+    title = t('brandname')
+
+    = stylesheet_link_tag 'base'
+    = stylesheet_link_tag 'application'
+
+    = javascript_pack_tag 'application'
+    = javascript_include_tag 'application'
+
+  body
+    = yield
+    
diff --git a/config/routes.rb b/config/routes.rb
index 5fc39ba92..2715ca428 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -241,6 +241,10 @@ ChouetteIhm::Application.routes.draw do
 
   root :to => "dashboards#show"
 
+  if Rails.env.development? || Rails.env.test?
+    get "/snap" => "snapshots#show"
+  end
+
   get '/help/(*slug)' => 'help#show'
 
   if Rails.application.config.development_toolbar
diff --git a/spec/support/snapshot_support.rb b/spec/support/snapshot_support.rb
index f1a6b1469..c37bb075c 100644
--- a/spec/support/snapshot_support.rb
+++ b/spec/support/snapshot_support.rb
@@ -6,14 +6,27 @@ RSpec::Matchers.define :match_actions_links_snapshot do |name|
 
   failure_message do |actual|
     out = ["Snapshots did not match."]
-    expected = File.read(File.dirname(method_missing(:class).metadata[:file_path]) + "/__snapshots__/#{name}.snap")
+    snap_path = File.dirname(method_missing(:class).metadata[:file_path]) + "/__snapshots__/#{name}.snap"
+    temp_path = Pathname.new "#{Rails.root}/tmp/__snapshots__/#{name}.failed.snap"
+    FileUtils.mkdir_p temp_path.dirname
+    tmp = File.new temp_path, "w"
+    tmp.write @content
+    tmp.close()
+    expected = File.read snap_path
     out << "Expected: #{expected}"
     out << "Actual: #{@content}"
     out << "\n\n --- DIFF ---"
     out << differ.diff_as_string(@content, expected)
+    out << "\n\n --- Previews : ---"
+    out << "Expected: \n" + snapshot_url(snap: snap_path, layout: :actions_links)
+    out << " \nActual:  \n" + snapshot_url(snap: tmp.path, layout: :actions_links)
     out.join("\n")
   end
 
+  def snapshot_url snap:, layout:
+    "http://localhost:3000/snap/?snap=#{URI.encode(snap.to_s)}&layout=#{URI.encode(layout.to_s)}"
+  end
+
   def differ
     RSpec::Support::Differ.new(
         :object_preparer => lambda { |object| RSpec::Matchers::Composable.surface_descriptions_in(object) },