102 lines
1.3 KiB
Markdown
102 lines
1.3 KiB
Markdown
---
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title: ExUnit
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category: Elixir
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layout: 2017/sheet
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updated: 2017-08-26
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---
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### Test cases
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```elixir
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defmodule MyTest do
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use ExUnit.Case
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use ExUnit.Case, async: true # for async
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test "the truth" do
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assert 1 + 1 == 2
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end
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end
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```
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### Capture IO
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```elixir
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import ExUnit.CaptureIO
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test "capture io" do
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result = capture_io(fn ->
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IO.puts "sup"
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end)
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assert result == "sup\n"
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end
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```
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### Capture logs
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```elixir
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config :ex_unit, capture_logs: true
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```
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### Async
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```elixir
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defmodule AssertionTest do
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# run concurrently with other test cases
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use ExUnit.Case, async: true
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end
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```
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### Assertions
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```elixir
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assert x == y
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refute x == y
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assert_raise ArithmeticError, fn ->
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1 + "test"
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end
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assert_raise ArithmeticError, "message", fn -> ...
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assert_raise ArithmeticError, ~r/message/, fn -> ...
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flunk "This should've been an error"
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```
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See: [Assertions](http://devdocs.io/elixir/ex_unit/exunit.assertions)
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## Setup
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### Pattern matching
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```elixir
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setup do
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{:ok, name: "John"}
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end
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```
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```elixir
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test "it works", %{name: name} do
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assert name == "John"
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end
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```
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### Setup
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```elixir
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describe "a block" do
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setup [:my_hook]
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end
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defp my_hook(context) do
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# Invoked in every block in "a block"
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end
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```
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## Also see
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{: .-one-column}
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- <http://devdocs.io/elixir/ex_unit/exunit#configure/1>
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