Running tests in an umbrella app
From the collection Elixir

mix task
tdd
elixir
umbrella apps

Running tests in an umbrella app

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To run all tests

mix cmd --app child_app_name mix test --color

Specific file/line

mix cmd --app child_app_name mix test test/child_app_name_nice_test.exs:69 --color

We can also define a Mix task to make our life easier!

def aliases do
  [
    child_test: "cmd --app child_app_name mix test --color"
  ]
end

Then you call 
mix child_test
or
mix child_test test/child_app_name_nice_test.exs:69


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