🔬 microtest

Version 1.2.9

A small testing framework inspired by minitest/minitest.cr.

Features

• This framework is opinionated
• It uses power asserts by default. There are no assert_equals, assert_xyz, just power asserts (except for assert_raises)
• It uses the spec syntax for test case structure (describe, test, before, after). Reasons: No test-case name-clashes when using describe. Not forgetting to call super in setup/teardown methods.
• No nesting of describe blocks. IMO nesting of those blocks is an anti-pattern.
• No let-definitions. Only before / after hooks. Use local variables mostly.
• Tests have to be started explicitly by Microtest.run!, no at-exit hook.
• Colorized and abbreviated exception stacktraces
• Randomized test order (SEED can be specified as environment variable)
• Focus individual tests (test! "my test" do ...)
• Different reportes (progress, descriptions, slow tests)

Installation

Add this to your application's shard.yml:

development_dependencies:
  microtest:
    github: ragmaanir/microtest
    version: ~> 1.2.9

And add this to your spec_helper.rb:

require "microtest"

include Microtest::DSL

Microtest.run!

Usage

class WaterPump
  getter name : String
  getter speed : Int32
  getter? enabled : Bool = false

  def initialize(@name, @speed = 10)
  end

  def enable
    @enabled = true
  end
end

describe WaterPump do
  test "enabling" do
    p = WaterPump.new("main")
    p.enable

    assert(p.enabled?)
  end

  test "pump speed" do
    p = WaterPump.new("main", speed: 100)

    assert(p.speed > 50)
  end

  test "this one is pending since it got no body"

  pending "this one is pending even though it has a body" do
    raise "should not raise"
  end
end

Run the test with:

crystal spec

You can provide the seed to run the tests in the same order:

SEED=123 crystal spec

Power Assert Output

describe AssertionFailure do
  test "assertion failure" do
    a = 5
    b = "aaaaaa"
    assert "a" * a == b
  end
end

Generates:

Microtest Test Output (microtest tests using progress reporter)

Reporters

Use common reporter combinations:

# both versions include error-list-, slow-tests- and summary-reporters:
Microtest.run!(:progress)
Microtest.run!(:descriptions)

Or select the used reporters explicitly:

Microtest.run!([
  Microtest::DescriptionReporter.new,
  Microtest::ErrorListReporter.new,
  Microtest::SlowTestsReporter.new,
  Microtest::SummaryReporter.new,
] of Microtest::Reporter)

describe First do
  test "success" do
  end

  test "skip this"
end

describe Second do
  def raise_an_error
    raise "Oh, this is wrong"
  end

  test "first failure" do
    a = 5
    b = 7
    assert a == b * 2
  end

  test "error" do
    raise_an_error
  end
end

Progress Reporter

Description Reporter

When focus active

describe Focus do
  test "not focused" do
  end

  test! "focused" do
  end

  test "focused too", :focus do
  end
end

Development

Run ./cli readme to run tests and generate README.md from README.md.ecr and generate the images of the test outputs (using an alpine docker image).