Include duration in budgets table

spec/components/admin/budgets/duration_component_spec.rb

@@ -0,0 +1,57 @@
+require "rails_helper"
+
+describe Admin::Budgets::DurationComponent, type: :component do
+  describe "#dates" do
+    it "shows both dates when both are defined" do
+      durable = double(
+        starts_at: Time.zone.local(2015, 8, 1, 12, 0, 0),
+        ends_at: Time.zone.local(2016, 9, 30, 16, 30, 00)
+      )
+
+      dates = Admin::Budgets::DurationComponent.new(durable).dates
+
+      render dates
+
+      expect(page.text).to eq "2015-08-01 12:00:00 - 2016-09-30 16:29:59"
+      expect(dates).to be_html_safe
+    end
+
+    it "shows the start date when no end date is defined" do
+      durable = double(starts_at: Time.zone.local(2015, 8, 1, 12, 0, 0), ends_at: nil)
+      render Admin::Budgets::DurationComponent.new(durable).dates
+
+      expect(page.text).to eq "2015-08-01 12:00:00 - "
+    end
+
+    it "shows the end date when no start date is defined" do
+      durable = double(starts_at: nil, ends_at: Time.zone.local(2016, 9, 30, 16, 30, 00))
+
+      render Admin::Budgets::DurationComponent.new(durable).dates
+
+      expect(page.text).to eq "- 2016-09-30 16:29:59"
+    end
+  end
+
+  describe "#duration" do
+    it "describes the total duration in human language" do
+      durable = double(
+        starts_at: Time.zone.local(2015, 8, 1, 12, 0, 0),
+        ends_at: Time.zone.local(2016, 9, 30, 16, 30, 00)
+      )
+
+      render Admin::Budgets::DurationComponent.new(durable).duration
+
+      expect(page.text).to eq "about 1 year"
+    end
+  end
+
+  attr_reader :content
+
+  def render(content)
+    @content = content
+  end
+
+  def page
+    Capybara::Node::Simple.new(content)
+  end
+end