it(`should render ${frequency} as ${frequency.displayValue}`, () => {
   expect(FrequencyViewFilter.render(frequency)).to.equal(frequency.displayValue)
 })
 expect(() => FrequencyViewFilter.renderPaymentFrequency(null)).to.throw(TypeError)
 () => {
   expect(FrequencyViewFilter.renderPaymentFrequency(
     Frequency.toPaymentFrequency(Frequency.of(PaymentFrequency.FOUR_WEEKS)
     ))).to.equal(Frequency.FOUR_WEEKLY.displayValue)
 }
 () => {
   expect(FrequencyViewFilter.renderPaymentFrequency(
     Frequency.toPaymentFrequency(Frequency.of(PaymentFrequency.MONTH)
     ))).to.equal(Frequency.MONTHLY.displayValue)
 }
 it(`should render payment frequency ${PaymentFrequency.WEEK} as ${Frequency.WEEKLY.displayValue}`, () => {
   expect(FrequencyViewFilter.renderPaymentFrequency(
     Frequency.toPaymentFrequency(Frequency.of(PaymentFrequency.WEEK)))).to.equal(Frequency.WEEKLY.displayValue)
 })