February 19, 2024

Defining Preferred CLI Environments for Mix Aliases in Elixir

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Defining Preferred CLI Environments for Mix Aliases in Elixir

Source: elixirstreams.com

The content focuses on a common issue Elixir developers might face when they try to run a specific subset of tests using mix aliases. When developers create an alias, such as 'mix test.live' for feature tests tagged with 'live', they often encounter an error because it runs in the 'dev' environment by default. The article suggests a workaround to avoid having to specify 'MIX_ENV=test' each time by using 'preferred_cli_envs' in the project definition. Moreover, it highlights an update since Elixir 1.15, where a 'cli/0' function can be used instead to specify the preferred environment directly. The piece provides a practical solution to streamline the testing process in Elixir applications.

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