Enable strict_predicate_matchers when available

Author: marcandre

spec/spec_helper.rb

@@ -87,6 +87,9 @@ def handle_current_dir_change
   c.expect_with :rspec do |expectations|
     expectations.include_chain_clauses_in_custom_matcher_descriptions = true
     expectations.max_formatted_output_length = 1000
+    if expectations.respond_to? :strict_predicate_matchers=
+      expectations.strict_predicate_matchers = true
+    end
   end
 
   c.mock_with :rspec do |mocks|