```ruby
require 'spec_helper'

describe ReportsKit::ReportBuilder do
  subject { described_class.new(properties) }

  context 'with a datetime dimension' do
    let(:properties) do
      {
        measure: {
          key: 'issue',
          filters: [
            {
              key: 'opened_at',
              criteria: {
                operator: 'between',
                value: '-1w - now'
              }
            }
          ]
        }
      }
    end

    it 'transforms the filter criteria' do
      expect(subject.properties[:measures][0][:filters][0]).to eq({
        key: 'opened_at',
        criteria: {
          operator: 'between',
          value: "#{format_criteria_time(1.week.ago)} - #{format_criteria_time(Time.zone.now)}"
        }
      })
    end
  end
end
```

Improve scope of ReportBuilder example's expectation
user
```ruby
require 'spec_helper'

describe ReportsKit::ReportBuilder do
  subject { described_class.new(properties) }

  context 'with a datetime dimension' do
    let(:properties) do
      {
        measure: {
          key: 'issue',
          filters: [
            {
              key: 'opened_at',
              criteria: {
                operator: 'between',
                value: '-1w - now'
              }
            }
          ]
        }
      }
    end

    it 'transforms the filter criteria' do
      expect(subject.date_range('opened_at')).to include("#{format_criteria_time(1.week.ago)} - #{format_criteria_time(Time.zone.now)}")
    end
  end
end
```
assistant