progress-back-to-back ... 
  - Foo 1
  - Foo 2
  - Foo 3
  - Foo 4
progress-back-to-back ... ok
all 1 tests successful
---
  % cat .stderr
  [btest] -- Foo 1
  [btest] -- Foo 1 -- 2019-08-27T04:12:51.015Z
  [btest] -- Foo 2
  [btest] -- Foo 2 -- 2019-08-27T04:12:51.024Z
  [btest] -- Foo 3
  [btest] -- Foo 3 -- 2019-08-27T04:12:51.034Z
  [btest] -- Foo 4
  [btest] -- Foo 4 -- 2019-08-27T04:12:51.042Z

all 1 tests successful
---
progress-back-to-back ...
  > bash %INPUT >&2
  - Foo 1
  - Foo 2
  - Foo 3
  - Foo 4
... progress-back-to-back ok
all 1 tests successful
---
---
