Implement `yaml_eq' condition keyword

spec/producer/core/tests/yaml_eq_spec.rb

@@ -0,0 +1,47 @@
+require 'spec_helper'
+
+module Producer::Core
+  module Tests
+    describe YAMLEq, :env do
+      let(:filepath)  { 'some_file' }
+      let(:data)      { { foo: 'bar' } }
+      subject(:test)  { described_class.new(env, filepath, data, {}) }
+
+      it_behaves_like 'test'
+
+      describe '#verify' do
+        context 'when file content matches' do
+          before do
+            allow(remote_fs)
+              .to receive(:file_read).with(filepath) { ':foo: bar' }
+          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: baz' }
+          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