Class: Megatest::Runtime

Inherits:
Object
  • Object
show all
Defined in:
lib/megatest/runtime.rb

Defined Under Namespace

Classes: Expression

Constant Summary collapse

EMPTY_BACKTRACE = 
[].freeze
UNSET = 
BasicObject.new

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, test_case, result) ⇒ Runtime

Returns a new instance of Runtime.



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# File 'lib/megatest/runtime.rb', line 9

def initialize(config, test_case, result)
  @config = config
  @test_case = test_case
  @result = result
  @asserting = false
  @on_teardown = []
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/megatest/runtime.rb', line 7

def config
  @config
end

#on_teardown ⇒ Object (readonly)

Returns the value of attribute on_teardown.



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# File 'lib/megatest/runtime.rb', line 7

def on_teardown
  @on_teardown
end

#result ⇒ Object (readonly)

Returns the value of attribute result.



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# File 'lib/megatest/runtime.rb', line 7

def result
  @result
end

#test_case ⇒ Object (readonly)

Returns the value of attribute test_case.



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# File 'lib/megatest/runtime.rb', line 7

def test_case
  @test_case
end

Instance Method Details

#assert(uplevel: 1) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 27

def assert(uplevel: 1)
  if @asserting
    yield
  else
    @asserting = true
    @result.assertions_count += 1
    begin
      yield
    rescue Assertion => failure
      if failure.backtrace.empty?
        failure.set_backtrace(caller_locations(uplevel + 2))
      end
      raise
    ensure
      @asserting = false
    end
  end
end

#build_message(strings) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 132

def build_message(strings)
  return if strings.empty?

  if (strings.size + strings.sum(&:size)) < 80
    strings.join(" ")
  else
    strings.join("\n\n")
  end
end

#diff(expected, actual) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 240

def diff(expected, actual)
  @config.diff(expected, actual)
end

#expect_no_failures ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 105

def expect_no_failures
  was_asserting = @asserting
  @asserting = false
  yield
rescue Assertion, *Megatest::IGNORED_ERRORS
  raise # Exceptions we shouldn't rescue
rescue Exception => unexpected_error
  raise UnexpectedError, unexpected_error, EMPTY_BACKTRACE
ensure
  @asserting = was_asserting
end

#expression(expression, block) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 177

def expression(expression, block)
  if String === expression
    Expression.new(expression, block)
  else
    expression
  end
end

#fail(user_message, *message) ⇒ Object

Raises:



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# File 'lib/megatest/runtime.rb', line 119

def fail(user_message, *message)
  message = build_message(message)
  if user_message
    user_message = user_message.call if user_message.respond_to?(:call)
    user_message = String(user_message)
    if message && !user_message.end_with?("\n")
      user_message += "\n"
    end
    message = "#{user_message}#{message}"
  end
  raise(Assertion, message, EMPTY_BACKTRACE)
end

#minitest_compatibility? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/megatest/runtime.rb', line 185

def minitest_compatibility?
  @config.minitest_compatibility
end

#msg(positional, keyword) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 95

def msg(positional, keyword)
  if positional.nil?
    keyword
  elsif !keyword.nil?
    raise ArgumentError, "Can't pass both a positional and keyword assertion message"
  else
    positional # TODO: deprecation mechanism
  end
end

#pp(object) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 189

def pp(object)
  @config.render_object(object)
end

#pp_expression(callable) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 193

def pp_expression(callable)
  case callable
  when Expression
    callable.string
  when Proc
    # Logic borrowed from Active Support.
    if defined?(RubyVM::InstructionSequence)
      iseq = RubyVM::InstructionSequence.of(callable)
      return pp(callable) unless iseq

      source = if RubyVM::InstructionSequence.method_defined?(:script_lines) && iseq.script_lines
        iseq.script_lines.join("\n")
      elsif File.readable?(iseq.absolute_path)
        File.read(iseq.absolute_path)
      end
      return pp(callable) unless source

      location = iseq.to_a[4][:code_location]
      return pp(callable) unless location

      lines = source.lines[(location[0] - 1)..(location[2] - 1)]
      lines[-1] = lines[-1].byteslice(0...location[3])
      lines[0] = lines[0].byteslice(location[1]...-1)
      source = lines.join.strip

      # Ruby 4.1.0dev includes the `->`
      source.delete_prefix!("->")
      source.strip!

      # We ignore procs defined with do/end as they are likely multi-line anyway.
      if source.start_with?("{")
        source.delete_suffix!("}")
        source.delete_prefix!("{")
        source.strip!
        # It won't read nice if the callable contains multiple
        # lines, and it should be a rare occurrence anyway.
        # Same if it takes arguments.
        if !source.include?("\n") && !source.start_with?("|")
          return source
        end
      end
    end
  end

  pp(callable)
end

#record_failures(downlevel: 1, &block) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 252

def record_failures(downlevel: 1, &block)
  expect_no_failures(&block)
rescue Assertion => assertion
  error = assertion
  while error
    error = strip_backtrace(error, __FILE__, __LINE__ - 4, downlevel + 2)
    error = error.cause
  end

  @result.failures << Failure.new(assertion)
  true
else
  false
end

#safe_yield ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 142

def safe_yield
  yield
rescue Assertion, *IGNORED_ERRORS
  raise
rescue ::Exception => unexepected_exception
  raise UnexpectedError, unexepected_exception
end

#set?(arg) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/megatest/runtime.rb', line 160

def set?(arg)
  !UNSET.equal?(arg)
end

#strip_backtrace(error, yield_file, yield_line, downlevel) ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 46

def strip_backtrace(error, yield_file, yield_line, downlevel)
  if backtrace = error.backtrace_locations
    rindex = backtrace.rindex { |l| l.lineno == yield_line && l.path == yield_file }
    backtrace = backtrace.slice(0..rindex)
    backtrace.pop(downlevel) unless downlevel.zero?
    error.set_backtrace(backtrace)
  elsif backtrace = error.backtrace
    yield_point = "#{yield_file}:#{yield_line}:"
    rindex = backtrace.rindex { |l| l.start_with?(yield_point) }
    backtrace = backtrace.slice(0..rindex)
    backtrace.pop(downlevel) unless downlevel.zero?
    error.set_backtrace(backtrace)
  end

  error
end

#teardown ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 244

def teardown
  until @on_teardown.empty?
    record_failures do
      @on_teardown.pop.call
    end
  end
end

#unset ⇒ Object 



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# File 'lib/megatest/runtime.rb', line 152

def unset
  UNSET
end

#unset?(arg) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/megatest/runtime.rb', line 156

def unset?(arg)
  UNSET.equal?(arg)
end