anchor.diff:      // Exercise system
       sut.Customize(fixtureStub)
       // Verify outcome
  -    Assert.Empty(customizations)
  +    verify <@ customizations |> Seq.isEmpty @>
       // Teardown
   
  
positive.code:     // Exercise system
      let result = sut.Relay
      // Verify outcome
      Assert.IsType<FilteringSpecimenBuilder>(result)
      // Teardown
  
  [<Fact>]
  
negative.code:     // Exercise system
      let sut = AutoFoqCustomization()
      // Verify outcome
      verify <@ typeof<ICustomization>.IsAssignableFrom(sut.GetType()) @>
      // Teardown
  
  [<Fact>]
  let InitializeWithNullRelayThrows() =
      // Fixture setup
      // Exercise system and verify outcome
      raises<ArgumentNullException> <@ AutoFoqCustomization(null) @>
      // Teardown
  
  [<Fact>]
  