#!/usr/bin/ruby

#
# this script will run the unit tests in ../tests/*.rb.
#
# Tests for the platform differ from traditional ruby unit tests in a few ways:
#
# (1) at the end of every test function, you should call 'pass()'
# (2) you can specify test dependencies by calling depends_on("TestFirst") in the test class definition.
# (3) test functions are always run in alphabetical order.
# (4) any halt or error will stop the testing unless --continue is specified.
#

require 'minitest/unit'
require 'yaml'
require 'tsort'

##
## EXCEPTIONS
##

# this class is raised if a test file wants to be skipped entirely.
class SkipTest < Exception
end

# raised if --no-continue and there is an error
class TestError < Exception
end

# raised if --no-continue and there is a failure
class TestFailure < Exception
end

##
## CUSTOM UNIT TEST CLASS
##

#
# Our custom unit test class. All tests should be subclasses of this.
#
class LeapTest < MiniTest::Unit::TestCase
  class Pass < MiniTest::Assertion
  end

  #
  # Test class dependencies
  #
  def self.depends_on(*class_names)
    @dependencies ||= []
    @dependencies += class_names
  end
  def self.dependencies
    @dependencies || []
  end

  #
  # The default pass just does an `assert true`. In our case, we want to make the passes more explicit.
  #
  def pass
    raise LeapTest::Pass
  end

  #
  # Always runs test methods within a test class in alphanumeric order
  #
  def self.test_order
    :alpha
  end
end

#
# Custom test runner in order to modify the output.
#
class LeapRunner < MiniTest::Unit

  attr_accessor :passes

  def initialize
    @passes = 0
    super
  end

  #
  # call stack:
  #   MiniTest::Unit.new.run
  #     MiniTest::Unit.runner
  #       LeapTest._run
  #
  def _run args = []
    suites = LeapTest.send "test_suites"
    output.sync = true
    suites = TestDependencyGraph.new(suites).sorted
    results = _run_suites(suites, :test)
    @test_count      = results.inject(0) { |sum, (tc, _)| sum + tc }
    @assertion_count = results.inject(0) { |sum, (_, ac)| sum + ac }
    report.each {|msg| output.puts msg}
    status
  rescue Interrupt
    report.each {|msg| output.puts msg}
    abort 'Tests halted on interrupt.'
  rescue TestFailure
    report.each {|msg| output.puts msg}
    abort 'Tests halted on failure (because of --no-continue).'
  rescue TestError
    report.each {|msg| output.puts msg}
    abort 'Tests halted on error (because of --no-continue).'
  end

  #
  # override puke to change what prints out.
  #
  def puke(klass, meth, e)
    case e
      when MiniTest::Skip then
        @skips += 1
        #if @verbose
          @report << report_line("SKIP", klass, meth, e, e.message)
        #end
      when LeapTest::Pass then
        @passes += 1
        @report << report_line("PASS", klass, meth)
      when MiniTest::Assertion then
        @failures += 1
        @report << report_line("FAIL", klass, meth, e, e.message)
        if $halt_on_failure
          raise TestFailure.new
        end
      else
        @errors += 1
        bt = MiniTest::filter_backtrace(e.backtrace).join "\n"
        @report << report_line("ERROR", klass, meth, e, "#{e.class}: #{e.message}\n#{bt}")
        if $halt_on_failure
          raise TestError.new
        end
    end
    return "" # disable the marching ants
  end

  #
  # override default status slightly
  #
  def status(io = self.output)
    format = "%d tests, %d assertions, %d passes, %d failures, %d errors, %d skips"
    io.puts format % [test_count, assertion_count, passes, failures, errors, skips]
  end

  private

  #
  # returns a string for a PASS, SKIP, or FAIL error
  #
  def report_line(prefix, klass, meth, e=nil, message=nil)
    if e && message
      #indent = "\n" + (" " * (prefix.length+4))
      indent = "\n  "
      msg_txt = indent + message.split("\n").join(indent)
      "#{prefix}: #{readable(klass.name)} > #{readable(meth)} [#{File.basename(location(e))}]:#{msg_txt}\n"
    else
      "#{prefix}: #{readable(klass.name)} > #{readable(meth)}\n"
    end
  end

  #
  # Converts snake_case and CamelCase to something more pleasant for humans to read.
  #
  def readable(str)
    str.gsub(/([A-Z]+)([A-Z][a-z])/, '\1 \2').
    gsub(/([a-z])([A-Z])/, '\1 \2').
    gsub(/_/, ' ').
    sub(/^test /i, '').
    downcase
  end
end

##
## Dependency resolution
## Use a topographical sort to manage test dependencies
##

class TestDependencyGraph
  include TSort

  def initialize(test_classes)
    @dependencies = {}  # each key is a test class name, and the values
                        # are arrays of test class names that the key depends on.
    test_classes.each do |test_class|
      @dependencies[test_class.name] = test_class.dependencies
    end
  end

  def tsort_each_node(&block)
    @dependencies.each_key(&block)
  end

  def tsort_each_child(test_class_name, &block)
    @dependencies[test_class_name].each(&block)
  end

  def sorted
    self.tsort.collect {|class_name|
      Kernel.const_get(class_name)
    }
  end
end

##
## RUN THE TESTS
##

# load node data from hiera file
if File.exists?('/etc/leap/hiera.yaml')
  $node = YAML.load_file('/etc/leap/hiera.yaml')
else
  $node = {"services" => ['webapp'], "dummy" => true}
end

# load all test classes
Dir[File.expand_path('../../tests/*.rb', __FILE__)].each do |test_file|
  begin
    require test_file
  rescue SkipTest
  end
end

# parse command line options
$halt_on_failure = true
loop do
  case ARGV[0]
    when '--continue' then ARGV.shift; $halt_on_failure = false
    else break
  end
end

# run some tests already
MiniTest::Unit.runner = LeapRunner.new
MiniTest::Unit.new.run