crotest

A tiny and simple test framework for Crystal with common assertions and no pollution into Object class.

Example

require "crotest"

describe "DSL" do
  it "defines small test cases" do
    assert true
  end

  describe "nested describes for a better readability" do
    it "has only a few assertions" do
      var = false

      reject var
      assert_equal false, var
      assert_raise Exception do
        raise Exception.new("Boom!")
      end
    end
  end

  pending "tests are defined without a block"

  pending "tests can also be defined with a block, which will not be executed" do
    fail "This won't be executed :)"
  end
end

Installation

Add this to your application's shard.yml:

dependencies:
  crotest:
    github: emancu/crotest

Usage

require "crotest"

Run your tests with crystal spec.

Assertions

• assert
• reject
• assert_equal
• assert_raise

Custom assertions

Extend the assertions used by Crotest is really easy. You need to open the module Crotest::Assertions and add your assertions like the example below:

require "crotest"

module Crotest::Assertions
  macro assert_greater_than_4(value, file = __FILE__, line = __LINE__)
    assert {{value}} > 4, "#{{{value}}} <= 4", {{file}}, {{line}}
  end
end


it "supports my custom assertion" do
  assert_greater_than_4 5
end

Before/After blocks

If you need to run code before or after each test, declare each block like in the example below. Remember to define before/after blocks before the corresponding it blocks. Given this is not dynamically evaluated, we must define at the beginning of the file or describe block.

before do
  # First block to be executed
end

after do
  # Fifth and last block to be executed
end

describe "a nested context" do
  before do
    # Second block to be executed
  end

  after do
    # Fourth block to be executed
  end

  it "executes the before blocks and" do
    # Third block to be executed
  end
end

Contributing

1. Fork it ( https://github.com/emancu/crotest/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• emancu Emiliano Mancuso - creator, maintainer