Flow Ecto like assertions in ExUnit

[Pedro Carvalho]

It would be nice if you could assert fields of structures in a piped ecto like style.

Ex:

my_struct

|> assert_not_nil([:some_field,:other_field]

|> assert_exists([:another_field])
|> do_something()
|> assert_expression([new_struct],  new_struct.another_field != my_struct.another_field  )

[Ben Wilson]

Seems like a good opportunity for a library. There's not anything I'm seeing there that would require changes to the core language. Building a library is a good way to test out if it's a popular idea and work though any of the design challenges.