MiniTest::Chain

MiniTest::Chain gives you readable, RSpec-comparable, chainable assertions:

require 'minitest-chain'

class TestChain < MiniTest::Unit::TestCase
  include MiniTest::Chain
  
  def test_plus
    assert(2 + 2).equal(4)
    assert(2 + 2).not_equal(5)
  end

  def test_minus
    assert(2 - 2).is(:zero?)
    assert(2 - 1).is_not(:zero?)
  end

  def test_expect
    list = [1, 2, 3]
    expect(list.index(4)).nil
  end

  def test_expect_raise
    expect { 1 + '2' }.raises(TypeError)
  end
end

The following assertions are available:

#equal (assert_equal)
#match (assert_match)
#nil (assert_nil)
#close_to (assert_in_delta)
#within_epsilon (assert_in_epsilon)
#instance_of (assert_instance_of)
#kind_of (assert_kind_of)
#same (assert_same)
#empty (assert_empty)
#include (assert_includes)
#is (assert_operator / assert_predicate)
#respond_to (assert_respond_to)
#raises (assert_raises)
#throws (assert_throws)
#silent (assert_silent)
#output (assert_output)

You can negate the assertion by prepending the method name with not_ (e.g. not_equal). The only exception being is which can be negated by is_not.

You can use expect to start a chain without requiring a value to be truthy.

minitest-chain

Runtime

MiniTest::Chain