Report class can define and retrieve header

lib/open_food_network/reports/report.rb

@@ -0,0 +1,14 @@
+module OpenFoodNetwork::Reports
+  class Report
+    # -- API
+    def header
+      @@header
+    end
+
+
+    # -- DSL
+    def self.header(*columns)
+      @@header = columns
+    end
+  end
+end

spec/lib/open_food_network/reports/report_spec.rb

@@ -0,0 +1,15 @@
+require 'open_food_network/reports/report'
+
+module OpenFoodNetwork::Reports
+  class TestReport < Report
+    header 'One', 'Two', 'Three'
+  end
+
+  describe Report do
+    let(:report) { TestReport.new }
+
+    it "returns the header" do
+      report.header.should == %w(One Two Three)
+    end
+  end
+end