REPL with the testing enviroment of a package

Is there a way to activate the environment which is used for tests in a REPL (i.e. loading the packages specified in the [extra] section of Project.toml)? (or, asked differently: When you work on PRs, in which environment is it best to work?)

Use TestEnv.jl, you can do TestEnv.activate() or TestEnv.activate("PackageName").

I normally work in the package environment and then use TestEnv when I have test specific dependencies.

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Perfect, thanks!