Update spec_helper with all rspec 3 features

MSP-13484

Copied from metasploit-cache.

spec/spec_helper.rb

@@ -14,13 +14,7 @@ require 'active_record/railtie'
 require File.expand_path('../../config/environment', __FILE__)
 
 # Don't `require 'rspec/rails'` as it includes support for pieces of rails that metasploit-framework doesn't use
-require 'rspec/core'
-require 'rails/version'
-require 'rspec/rails/adapters'
-require 'rspec/rails/extensions'
-require 'rspec/rails/fixture_support'
-require 'rspec/rails/matchers'
-require 'rspec/rails/mocks'
+require 'rspec/rails'
 
 require 'metasploit/framework/spec'
 
@@ -42,22 +36,63 @@ engines.each do |engine|
 end
 
 RSpec.configure do |config|
-  config.mock_with :rspec do |mocks|
-    mocks.yield_receiver_to_any_instance_implementation_blocks = true
+  config.raise_errors_for_deprecations!
+
+  config.expose_dsl_globally = false
+
+  # These two settings work together to allow you to limit a spec run
+  # to individual examples or groups you care about by tagging them with
+  # `:focus` metadata. When nothing is tagged with `:focus`, all examples
+  # get run.
+  config.filter_run :focus
+  config.run_all_when_everything_filtered = true
+
+  # allow more verbose output when running an individual spec file.
+  if config.files_to_run.one?
+    # RSpec filters the backtrace by default so as not to be so noisy.
+    # This causes the full backtrace to be printed when running a single
+    # spec file (e.g. to troubleshoot a particular spec failure).
+    config.full_backtrace = true
   end
 
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
   # Run specs in random order to surface order dependencies. If you find an
   # order dependency and want to debug it, you can fix the order by providing
   # the seed, which is printed after each run.
   #     --seed 1234
-  config.order = 'random'
+  config.order = :random
 
-  config.treat_symbols_as_metadata_keys_with_true_values = true
-
-  # If you're not using ActiveRecord, or you'd prefer not to run each of your
-  # examples within a transaction, remove the following line or assign false
-  # instead of true.
   config.use_transactional_fixtures = true
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+
+  config.expect_with :rspec do |expectations|
+    # Enable only the newer, non-monkey-patching expect syntax.
+    expectations.syntax = :expect
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Enable only the newer, non-monkey-patching expect syntax.
+    # For more details, see:
+    #   - http://teaisaweso.me/blog/2013/05/27/rspecs-new-message-expectation-syntax/
+    mocks.syntax = :expect
+
+    mocks.patch_marshal_to_support_partial_doubles = false
+
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object.
+    mocks.verify_partial_doubles = true
+  end
 end
 
 Metasploit::Framework::Spec::Constants::Suite.configure!