Implement task evaluation feature

spec/producer/core/task_spec.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+module Producer::Core
+  describe Task do
+    let(:name)      { :some_task }
+    let(:block)     { }
+    subject(:task)  { Task.new(name, &block) }
+
+    describe '#name' do
+      it 'returns its name' do
+        expect(task.name).to eq name
+      end
+    end
+
+    describe 'evaluate' do
+      let(:block) { Proc.new { raise 'error from task' } }
+
+      it 'evaluates its block' do
+        expect { task.evaluate }.to raise_error(RuntimeError, 'error from task')
+      end
+    end
+  end
+end