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/producer/core/tests/file_contains_spec.rb

@@ -2,8 +2,7 @@ require 'spec_helper'
 
 module Producer::Core
   module Tests
-    describe FileContains do
-      let(:env)       { Env.new }
+    describe FileContains, :env do
       let(:filepath)  { 'some_file' }
       let(:content)   { 'some_content' }
       subject(:test)  { FileContains.new(env, filepath, content) }
@@ -11,13 +10,9 @@ module Producer::Core
       it_behaves_like 'test'
 
       describe '#verify' do
-        let(:fs) { double 'fs' }
-
-        before { allow(test).to receive(:fs) { fs } }
-
         context 'when file contains the content' do
           before do
-            allow(fs)
+            allow(remote_fs)
               .to receive(:file_read).with(filepath) { "foo#{content}bar" }
           end
 
@@ -28,7 +23,7 @@ module Producer::Core
 
         context 'when file does not contain the content' do
           before do
-            allow(fs).to receive(:file_read).with(filepath) { 'foo bar' }
+            allow(remote_fs).to receive(:file_read).with(filepath) { 'foo bar' }
           end
 
           it 'returns false' do
@@ -37,7 +32,9 @@ module Producer::Core
         end
 
         context 'when file does not exist' do
-          before { allow(fs).to receive(:file_read).with(filepath) { nil } }
+          before do
+            allow(remote_fs).to receive(:file_read).with(filepath) { nil }
+          end
 
           it 'returns false' do
             expect(test.verify).to be false

spec/producer/core/tests/has_dir_spec.rb

@@ -2,24 +2,21 @@ require 'spec_helper'
 
 module Producer::Core
   module Tests
-    describe HasDir do
-      let(:env)         { Env.new }
+    describe HasDir, :env do
       let(:path)        { 'some_directory' }
       subject(:has_dir) { HasDir.new(env, path) }
 
       it_behaves_like 'test'
 
-      describe '#verify', :ssh do
-        before { sftp_story }
-
+      describe '#verify' do
         it 'delegates the call on remote FS' do
-          expect(env.remote.fs).to receive(:dir?).with(path)
+          expect(remote_fs).to receive(:dir?).with(path)
           has_dir.verify
         end
 
         it 'returns the dir existence' do
           existence = double 'existence'
-          allow(env.remote.fs).to receive(:dir?) { existence }
+          allow(remote_fs).to receive(:dir?) { existence }
           expect(has_dir.verify).to be existence
         end
       end

spec/producer/core/tests/has_file_spec.rb

@@ -2,24 +2,21 @@ require 'spec_helper'
 
 module Producer::Core
   module Tests
-    describe HasFile do
-      let(:env)           { Env.new }
+    describe HasFile, :env do
       let(:filepath)      { 'some_file' }
       subject(:has_file)  { HasFile.new(env, filepath) }
 
       it_behaves_like 'test'
 
-      describe '#verify', :ssh do
-        before { sftp_story }
-
+      describe '#verify' do
         it 'delegates the call on remote FS' do
-          expect(env.remote.fs).to receive(:file?).with(filepath)
+          expect(remote_fs).to receive(:file?).with(filepath)
           has_file.verify
         end
 
         it 'returns the file existence' do
           existence = double 'existence'
-          allow(env.remote.fs).to receive(:file?) { existence }
+          allow(remote_fs).to receive(:file?) { existence }
           expect(has_file.verify).to be existence
         end
       end