Implement `file_eq' condition keyword

features/test_file_eq.feature

@@ -0,0 +1,26 @@
+@sshd
+Feature: `file_eq' condition keyword
+
+  Background:
+    Given a recipe with:
+      """
+      task :file_eq_test do
+        condition { file_eq 'some_file', 'some content' }
+
+        echo 'evaluated'
+      end
+      """
+
+  Scenario: succeeds when file content is expected content
+    Given a remote file named "some_file" with "some content"
+    When I successfully execute the recipe on remote target
+    Then the output must contain "evaluated"
+
+  Scenario: fails when file content is not expected content
+    Given a remote file named "some_file" with "some content padded"
+    When I successfully execute the recipe on remote target
+    Then the output must not contain "evaluated"
+
+  Scenario: fails when file does not exist
+    When I successfully execute the recipe on remote target
+    Then the output must not contain "evaluated"

lib/producer/core.rb

@@ -18,6 +18,7 @@ require 'producer/core/actions/file_writer'
 require 'producer/core/test'
 require 'producer/core/tests/condition_test'
 require 'producer/core/tests/file_contains'
+require 'producer/core/tests/file_eq'
 require 'producer/core/tests/has_dir'
 require 'producer/core/tests/has_env'
 require 'producer/core/tests/has_executable'

lib/producer/core/condition/dsl.rb

@@ -25,6 +25,7 @@ module Producer
         define_test :`,               Tests::ShellCommandStatus
         define_test :sh,              Tests::ShellCommandStatus
         define_test :file_contains,   Tests::FileContains
+        define_test :file_eq,         Tests::FileEq
         define_test :env?,            Tests::HasEnv
         define_test :executable?,     Tests::HasExecutable
         define_test :dir?,            Tests::HasDir

lib/producer/core/tests/file_eq.rb

@@ -0,0 +1,22 @@
+module Producer
+  module Core
+    module Tests
+      class FileEq < Test
+        def verify
+          file_content ? file_content == expected_content : false
+        end
+
+
+        private
+
+        def file_content
+          @file_content ||= fs.file_read(arguments[0])
+        end
+
+        def expected_content
+          arguments[1]
+        end
+      end
+    end
+  end
+end

spec/producer/core/condition/dsl_spec.rb

@@ -11,6 +11,7 @@ module Producer::Core
         `
         sh
         file_contains
+        file_eq
         dir?
         env?
         executable?

spec/producer/core/tests/file_eq_spec.rb

@@ -0,0 +1,45 @@
+require 'spec_helper'
+
+module Producer::Core
+  module Tests
+    describe FileEq, :env do
+      let(:filepath)  { 'some_file' }
+      let(:content)   { 'some content' }
+      subject(:test)  { FileEq.new(env, filepath, content) }
+
+      it_behaves_like 'test'
+
+      describe '#verify' do
+        context 'when file content matches' do
+          before do
+            allow(remote_fs).to receive(:file_read).with(filepath) { content }
+          end
+
+          it 'returns true' do
+            expect(test.verify).to be true
+          end
+        end
+
+        context 'when file content does not match' do
+          before do
+            allow(remote_fs).to receive(:file_read).with(filepath) { 'foo bar' }
+          end
+
+          it 'returns false' do
+            expect(test.verify).to be false
+          end
+        end
+
+        context 'when file does not exist' do
+          before do
+            allow(remote_fs).to receive(:file_read).with(filepath) { nil }
+          end
+
+          it 'returns false' do
+            expect(test.verify).to be false
+          end
+        end
+      end
+    end
+  end
+end