Increase the default formatted output's length

Warning text that includes file paths was cut off when a spec was
failing due to a Ruby warning.

Author: pirj

spec/spec_helper.rb

@@ -86,6 +86,7 @@ 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
   end
 
   c.mock_with :rspec do |mocks|