Implement rspec TestEnvHelpers:

Allow use of our test environment, with a mocked remote and convenient
methods to write more concise expectations.

  #env, builds and returns a memoized test environment (with mocked
  remote)

  #output, returns env output as a string

  #remote_fs, returns env remote fs

  #expect_execution, setup a remote command execution expectation

spec/support/shared_action.rb

@@ -1,8 +1,7 @@
 module Producer::Core
   shared_examples 'action' do
-    let(:input)       { StringIO.new }
-    let(:output)      { StringIO.new }
-    let(:env)         { Env.new(input: input, output: output) }
+    include TestEnvHelpers
+
     let(:arguments)   { [:some, :arguments] }
     subject(:action)  { described_class.new(env, *arguments) }
 
@@ -20,25 +19,25 @@ module Producer::Core
 
     describe '#input' do
       it 'returns env input' do
-        expect(action.input).to be input
+        expect(action.input).to be env.input
       end
     end
 
     describe '#output' do
       it 'returns env output' do
-        expect(action.output).to be output
+        expect(action.output).to be env.output
       end
     end
 
     describe '#remote' do
       it 'returns env remote' do
-        expect(action.remote).to be action.env.remote
+        expect(action.remote).to be env.remote
       end
     end
 
     describe '#fs' do
       it 'returns env remote fs' do
-        expect(action.fs).to be action.env.remote.fs
+        expect(action.fs).to be env.remote.fs
       end
     end
   end

spec/support/shared_test.rb

@@ -1,6 +1,7 @@
 module Producer::Core
   shared_examples 'test' do
-    let(:env)         { Env.new }
+    include TestEnvHelpers
+
     let(:arguments)   { [:some, :arguments] }
     subject(:test)    { described_class.new(env, *arguments) }
 

spec/support/test_env_helpers.rb

@@ -0,0 +1,31 @@
+module TestEnvHelpers
+  require 'producer/core/testing'
+
+  def env
+    @_env ||= build_env
+  end
+
+  def output
+    env.output.string
+  end
+
+  def remote_fs
+    env.remote.fs
+  end
+
+  def expect_execution(command)
+    opts = { expected_from: caller.first }
+    RSpec::Mocks.expect_message(env.remote, :execute, opts).with(command)
+  end
+
+
+  private
+
+  def build_env
+    Producer::Core::Env.new(output: StringIO.new, remote: build_remote)
+  end
+
+  def build_remote
+    Producer::Core::Testing::MockRemote.new('some_host.test')
+  end
+end