From 590ff858cf0fe71b420f8a59d393319e190f68aa Mon Sep 17 00:00:00 2001
From: Zog
Date: Mon, 22 Jan 2018 21:11:28 +0100
Subject: Refs #5669; Add a preview for snapshots for easier debugging

---
 spec/support/snapshot_support.rb | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'spec/support')

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) },
-- 
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