Add a be_sorted matcher

1 files changed, 14 insertions, 0 deletions

diff --git a/spec/support/matchers.rb b/spec/support/matchers.rb
index e91f04fb29..7316e43684 100644
--- a/spec/support/matchers.rb
+++ b/spec/support/matchers.rb
@@ -113,6 +113,20 @@ module Spec
       end
     end
 
+    RSpec::Matchers.define :be_sorted do
+      diffable
+      attr_reader :expected
+      match do |actual|
+        expected = block_arg ? actual.sort_by(&block_arg) : actual.sort
+        actual.==(expected).tap do
+          # HACK: since rspec won't show a diff when everything is a string
+          differ = RSpec::Support::Differ.new
+          @actual = differ.send(:object_to_string, actual)
+          @expected = differ.send(:object_to_string, expected)
+        end
+      end
+    end
+
     define_compound_matcher :read_as, [exist] do |file_contents|
       diffable