activity_spec.rb

# activity.rb

  def full_duration
    return (duration_in_minutes.to_f / 60).round(1)
  end

# activity_spec.rb

  describe "full_duration()" do
    context "when duration_in_minutes is saved in the database" do
      let(:duration_in_rounded_fractional_hours) { mock "duration in rounded fractional hours" }
      let(:duration_in_fractional_hours)         { mock "duration in fractional hours", :round => duration_in_rounded_fractional_hours }
      let(:duration_in_minutes_as_float)         { mock "duration in minutes as float", :/     => duration_in_fractional_hours }
      let(:duration_in_minutes)                  { mock "duration in minutes",          :to_f  => duration_in_minutes_as_float }

      before :each do
        activity.stub :duration_in_minutes => duration_in_minutes
      end

      it "gets the duration_in_minutes from the database" do
        activity.should_receive :duration_in_minutes
        activity.full_duration
      end

      it "converts the duration minutes from an integer to a float" do
        duration_in_minutes.should_receive :to_f
        activity.full_duration
      end

      it "converts the minutes into fractional hours" do
        duration_in_minutes_as_float.should_receive :/
        activity.full_duration
      end

      it "rounds the fractional hours with a precision of 1" do
        duration_in_fractional_hours.should_receive(:round).with(1)
        activity.full_duration
      end

      it "returns the duration in rounded fractional hours" do
        activity.full_duration.should equal duration_in_rounded_fractional_hours
      end
    end

    context "started_on and ended_on refer to days only" do
    end

    context "started_on and ended_on refer to times" do
    end
  end