View Source Criterion
A library to write ExUnit tests BDD style
Installation
The package can be installed
by adding criterion
to your list of dependencies in mix.exs
:
def deps do
[
{:criterion, "~> 0.1.0", only: [:test, :dev]}
]
end
Usage
Feature file
test/features/Math.feature
Feature: Math
Scenario: Square
Given a number greater than 1
When the number is multiplied by it self
Then the result is greater than the number
And pi is a constant
Shared steps
test/support/shared_steps.ex
defmodule Criterion.SharedSteps do
import Criterion
defstep "Given a number", _context, args do
min = args[:min] || 0
%{number: min + Enum.random(0..100)}
end
end
Test
test/criterion_test.exs
defmodule CriterionTest do
use ExUnit.Case
import Criterion
alias Criterion.SharedSteps
feature "Math" do
setup do
{:ok, pi: 3.14}
end
scenario "Square" do
step("Given a number greater than 1",
from: SharedSteps, # use only if the reusable step is in another module
via: "Given a number" # use only if the reusable step has a different step name,
where: [min: 2] # use only when you want to pass arguments to the reusable step,
)
step "When the number is multiplied by it self", %{number: number} do
result = number * number
%{result: result} # will be merged to the test context
end
step "Then the result is greater than the number", %{result: result, number: number} do
assert result > number
end
# you can access data from the initial context of the test
step "And pi is a constant", %{pi: pi} do
assert pi == 3.14
end
end
end
end
Generating feature files
mix criterion.gen.features
Options
--dir
- specify the directory to read test files from. default istest
--file
- to generate feature files for a list of test files--output
- specify the directory to generate feature files in. default istest/features
Generating test files
mix criterion.gen.tests
Options
--dir
- specify the directory to read feature files from. default istest/features
--file
- to generate test for a list of files--output
- specify the directory to generate the test files in. default istest/features