My personal opinion is that this community still has a long way to go before it can reach the maturity of other languages like Java and even Javascript when it comes to testing. If you come from one of those, being more open minded will be of huge help since the tooling is rather different.

Non the less, you will find some people here, like @peerreynders who not only disagree with me, but also are very knowledgeable in the area of testing. I would start by checking out some of his posts if you like digging.

However, I am not here to give you just a shovel with my opinion attached
Let’s talk about tools!

There are a lot, but on the top of my head I really recommend you have a look at ElixirConf 2016 - Painless Test Driven Development with Elixir and Phoenix by Kat Tornwall.

You can also read some cool looking blogs:

• Tips and Tricks for Writing Elixir BDD Gherkin Tests with White Bread

And have a look at some of the very nice projects the community has in Github:

• GitHub - meadery/white-bread: 🍞 Story BDD tool for elixir using gherkin · GitHub
• GitHub - cabbage-ex/cabbage: Story BDD tool for executing elixir in ExUnit · GitHub
• ESpec - Elixir Behaviour Driven Development

You can also have a look at some forum topics:

• Learning resources for Test Driven Development (TDD) in Phoenix?

I know TDD is not the same as BDD, but I believe you can still take away something from those discussion.

Hope it helps!