Remove support for Mocha version < 1.0

Mocha 1.0 is 7 years old now https://rubygems.org/gems/mocha/versions/1.0.0

Author: pirj

Changelog.md

@@ -23,6 +23,7 @@ Breaking Changes:
   `alias_it_should_behave_like_to` configuration option. (Phil Pirozhkov, #2864)
 * Remove deprecated `treat_symbols_as_metadata_keys_with_true_values` configuration
   option. (Phil Pirozhkov, #2864)
+* Remove support for Mocha version < 1.0. (Phil Pirozhkov, #2864)
 
 Enhancements:
 

lib/rspec/core/mocking_adapters/mocha.rb

@@ -1,28 +1,4 @@
-# In order to support all versions of mocha, we have to jump through some
-# hoops here.
-#
-# mocha >= '0.13.0':
-#   require 'mocha/api' is required.
-#   require 'mocha/object' raises a LoadError b/c the file no longer exists.
-# mocha < '0.13.0', >= '0.9.7'
-#   require 'mocha/api' is required.
-#   require 'mocha/object' is required.
-# mocha < '0.9.7':
-#   require 'mocha/api' raises a LoadError b/c the file does not yet exist.
-#   require 'mocha/standalone' is required.
-#   require 'mocha/object' is required.
-begin
-  require 'mocha/api'
-
-  begin
-    require 'mocha/object'
-  rescue LoadError
-    # Mocha >= 0.13.0 no longer contains this file nor needs it to be loaded.
-  end
-rescue LoadError
-  require 'mocha/standalone'
-  require 'mocha/object'
-end
+require 'mocha/api'
 
 module RSpec
   module Core
@@ -33,12 +9,7 @@ def self.framework_name
           :mocha
         end
 
-        # Mocha::Standalone was deprecated as of Mocha 0.9.7.
-        begin
-          include ::Mocha::API
-        rescue NameError
-          include ::Mocha::Standalone
-        end
+        include ::Mocha::API
 
         def setup_mocks_for_rspec
           mocha_setup