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Module: Minitest::Assertions

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
BenchSpec, Benchmark, Spec, Test, Unit::TestCase
Defined in: lib/minitest/assertions.rb,
lib/minitest/mock.rb

Overview

::Minitest Assertions. All assertion methods accept a msg which is printed if the assertion fails.

Protocol: Nearly everything here boils up to #assert, which expects to be able to increment an instance accessor named assertions. This is not provided by Assertions and must be provided by the thing including Assertions. See Runnable for an example.

Constant Summary

Class Attribute Summary

Instance Attribute Summary

Instance Method Summary

Class Attribute Details

.diff (rw)

Returns the diff command to use in #diff. Tries to intelligently figure out what diff to use.

[ GitHub ] 

  


# File 'lib/minitest/assertions.rb', line 27



def self.diff
  return @diff if defined? @diff

  @diff = if (RbConfig::CONFIG["host_os"] =~ /mswin|mingw/ and
              system "diff.exe", __FILE__, __FILE__) then
            "diff.exe -u"
          elsif system "gdiff", __FILE__, __FILE__ then
            "gdiff -u" # solaris and kin suck
          elsif system "diff", __FILE__, __FILE__ then
            "diff -u"
          else
            nil
          end
end


  








  

    .diff=(o)   (rw)
  



  

    

Set the diff command to use in #diff.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 45



def self.diff= o
  @diff = o
end


  







Instance Attribute Details



  

    #skipped?  ⇒ Boolean  (readonly)
  



  

    

Was this testcase skipped? Meant for #teardown.


  





  


  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 851



def skipped?
  defined?(@skip) and @skip
end


  







Instance Method Details



  

    #_synchronize  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 181



def _synchronize # :nodoc:
  yield
end


  








  

    #_where  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 194



def _where # :nodoc:
  Minitest.filter_backtrace(caller).first
    .split(":in ", 2).first # clean up noise
end


  








  

    #assert(test, msg = nil)  
  



  

    

Fails unless test is truthy.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 171



def assert test, msg = nil
  self.assertions += 1
  unless test then
    msg ||= "Expected #{mu_pp test} to be truthy."
    msg = msg.call if Proc === msg
    raise Minitest::Assertion, msg
  end
  true
end


  








  

    #assert_empty(obj, msg = nil)  
  



  

    

Fails unless obj is empty.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 188



def assert_empty obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp obj} to be empty" }
  assert_respond_to obj, :empty?
  assert obj.empty?, msg
end


  








  

    #assert_equal(exp, act, msg = nil)  
  



  

    

Fails unless exp == act printing the difference between the two, if possible.



If there is no visible difference but the assertion fails, you should suspect that your #== is buggy, or your inspect output is missing crucial details.  For nicer structural diffing, set Test.make_my_diffs_pretty!



For floats use assert_in_delta.



See also: .diff


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 214



def assert_equal exp, act, msg = nil
  msg = message(msg, E) { diff exp, act }
  result = assert exp == act, msg

  if nil == exp then
    if Minitest::VERSION >= "6" then
      refute_nil exp, "Use assert_nil if expecting nil."
    else
      warn "DEPRECATED: Use assert_nil if expecting nil from #{_where}. This will fail in Minitest 6."
    end
  end

  result
end


  








  

    #assert_in_delta(exp, act, delta = 0.001, msg = nil)  
  



  

    

For comparing Floats.  Fails unless exp and act are within delta of each other.



assert_in_delta Math::PI, (22.0 / 7.0), 0.01


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 235



def assert_in_delta exp, act, delta = 0.001, msg = nil
  n = (exp - act).abs
  msg = message(msg) {
    "Expected |#{exp} - #{act}| (#{n}) to be <= #{delta}"
  }
  assert delta >= n, msg
end


  








  

    #assert_in_epsilon(exp, act, epsilon = 0.001, msg = nil)  
  



  

    

For comparing Floats.  Fails unless exp and act have a relative error less than epsilon.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 247



def assert_in_epsilon exp, act, epsilon = 0.001, msg = nil
  assert_in_delta exp, act, [exp.abs, act.abs].min * epsilon, msg
end


  








  

    #assert_includes(collection, obj, msg = nil)  
  



  

    

Fails unless collection includes obj.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 254



def assert_includes collection, obj, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp collection} to include #{mu_pp obj}"
  }
  assert_respond_to collection, :include?
  assert collection.include?(obj), msg
end


  








  

    #assert_instance_of(cls, obj, msg = nil)  
  



  

    

Fails unless obj is an instance of cls.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 265



def assert_instance_of cls, obj, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp obj} to be an instance of #{cls}, not #{obj.class}"
  }

  assert obj.instance_of?(cls), msg
end


  








  

    #assert_kind_of(cls, obj, msg = nil)  
  



  

    

Fails unless obj is a kind of cls.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 276



def assert_kind_of cls, obj, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp obj} to be a kind of #{cls}, not #{obj.class}"
  }

  assert obj.kind_of?(cls), msg
end


  








  

    #assert_match(matcher, obj, msg = nil)  
  



  

    

Fails unless matcher =~ obj.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 287



def assert_match matcher, obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp matcher} to match #{mu_pp obj}" }
  assert_respond_to matcher, :=~
  matcher = Regexp.new Regexp.escape matcher if String === matcher
  assert matcher =~ obj, msg

  Regexp.last_match
end


  








  

    #assert_mock(mock)  
  



  

    

Assert that the mock verifies correctly.


  



  [ GitHub ]


  

  


# File 'lib/minitest/mock.rb', line 253



def assert_mock mock
  assert mock.verify
end


  








  

    #assert_nil(obj, msg = nil)  
  



  

    

Fails unless obj is nil


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 299



def assert_nil obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp obj} to be nil" }
  assert obj.nil?, msg
end


  








  

    #assert_operator(o1, op, o2 = UNDEFINED, msg = nil)  
  



  

    

For testing with binary operators. Eg:



assert_operator 5, :<=, 4


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 309



def assert_operator o1, op, o2 = UNDEFINED, msg = nil
  return assert_predicate o1, op, msg if UNDEFINED == o2
  msg = message(msg) { "Expected #{mu_pp o1} to be #{op} #{mu_pp o2}" }
  assert o1.__send__(op, o2), msg
end


  








  

    #assert_output(stdout = nil, stderr = nil)  
  



  

    

Fails if stdout or stderr do not output the expected results. Pass in nil if you don’t care about that streams output. Pass in “” if you require it to be silent. Pass in a regexp if you want to pattern match.



assert_output(/hey/) { method_with_output }



NOTE: this uses #capture_io, not #capture_subprocess_io.



See also: #assert_silent


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 327



def assert_output stdout = nil, stderr = nil
  flunk "assert_output requires a block to capture output." unless
    block_given?

  out, err = capture_io do
    yield
  end

  err_msg = Regexp === stderr ? :assert_match : :assert_equal if stderr
  out_msg = Regexp === stdout ? :assert_match : :assert_equal if stdout

  y = send err_msg, stderr, err, "In stderr" if err_msg
  x = send out_msg, stdout, out, "In stdout" if out_msg

  (!stdout || x) && (!stderr || y)
rescue Assertion
  raise
rescue => e
  raise UnexpectedError, e
end


  








  

    #assert_path_exists(path, msg = nil)  
  



  

    

Fails unless path exists.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 351



def assert_path_exists path, msg = nil
  msg = message(msg) { "Expected path '#{path}' to exist" }
  assert File.exist?(path), msg
end


  








  

    #assert_pattern  
  



  

    

For testing with pattern matching (only supported with Ruby 3.0 and later)



# pass
assert_pattern { [1,2,3] => [Integer, Integer, Integer] }

# fail "length mismatch (given 3, expected 1)"
assert_pattern { [1,2,3] => [Integer] }



The bare => pattern will raise a NoMatchingPatternError on failure, which would normally be counted as a test error. This assertion rescues NoMatchingPatternError and generates a test failure. Any other exception will be raised as normal and generate a test error.


  





  
Raises:


    
  
  • 
    (NotImplementedError)
  
    • 





  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 370



def assert_pattern
  raise NotImplementedError, "only available in Ruby 3.0+" unless RUBY_VERSION >= "3.0"
  flunk "assert_pattern requires a block to capture errors." unless block_given?

  begin # TODO: remove after ruby 2.6 dropped
    yield
    pass
  rescue NoMatchingPatternError => e
    flunk e.message
  end
end


  








  

    #assert_predicate(o1, op, msg = nil)  
  



  

    

For testing with predicates. Eg:



assert_predicate str, :empty?



This is really meant for specs and is front-ended by assert_operator:



str.must_be :empty?


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 391



def assert_predicate o1, op, msg = nil
  msg = message(msg) { "Expected #{mu_pp o1} to be #{op}" }
  assert o1.__send__(op), msg
end


  








  

    #assert_raises(*exp)  
  



  

    

Fails unless the block raises one of exp. Returns the exception matched so you can check the message, attributes, etc.



exp takes an optional message on the end to help explain failures and defaults to StandardError if no exception class is passed. Eg:



assert_raises(CustomError) { method_with_custom_error }



With custom error message:



assert_raises(CustomError, 'This should have raised CustomError') { method_with_custom_error }



Using the returned object:



error = assert_raises(CustomError) do
  raise CustomError, 'This is really bad'
end

assert_equal 'This is really bad', error.message


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 418



def assert_raises *exp
  flunk "assert_raises requires a block to capture errors." unless
    block_given?

  msg = "#{exp.pop}.\n" if String === exp.last
  exp << StandardError if exp.empty?

  begin
    yield
  rescue *exp => e
    pass # count assertion
    return e
  rescue Minitest::Assertion # incl Skip & UnexpectedError
    # don't count assertion
    raise
  rescue SignalException, SystemExit
    raise
  rescue Exception => e
    flunk proc {
      exception_details(e, "#{msg}#{mu_pp exp} exception expected, not")
    }
  end

  exp = exp.first if exp.size == 1

  flunk "#{msg}#{mu_pp exp} expected but nothing was raised."
end


  








  

    #assert_respond_to(obj, meth, msg = nil, include_all: false)  
  



  

    

Fails unless obj responds to meth. include_all defaults to false to match Object#respond_to?


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 450



def assert_respond_to obj, meth, msg = nil, include_all: false
  msg = message(msg) {
    "Expected #{mu_pp obj} (#{obj.class}) to respond to ##{meth}"
  }
  assert obj.respond_to?(meth, include_all), msg
end


  








  

    #assert_same(exp, act, msg = nil)  
  



  

    

Fails unless exp and act are #equal?


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 460



def assert_same exp, act, msg = nil
  msg = message(msg) {
    data = [mu_pp(act), act.object_id, mu_pp(exp), exp.object_id]
    "Expected %s (oid=%d) to be the same as %s (oid=%d)" % data
  }
  assert exp.equal?(act), msg
end


  








  

    #assert_send(send_ary, m = nil)  
  



  

    

send_ary is a receiver, message and arguments.



Fails unless the call returns a true value


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 473



def assert_send send_ary, m = nil
  warn "DEPRECATED: assert_send. From #{_where}"

  recv, msg, *args = send_ary
  m = message(m) {
    "Expected #{mu_pp recv}.#{msg}(*#{mu_pp args}) to return true"
  }
  assert recv.__send__(msg, *args), m
end


  








  

    #assert_silent  
  



  

    

Fails if the block outputs anything to stderr or stdout.



See also: #assert_output


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 488



def assert_silent
  assert_output "", "" do
    yield
  end
end


  








  

    #assert_throws(sym, msg = nil)  
  



  

    

Fails unless the block throws sym


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 497



def assert_throws sym, msg = nil
  default = "Expected #{mu_pp sym} to have been thrown"
  caught = true
  value = catch sym do
    begin
      yield
    rescue ThreadError => e       # wtf?!? 1.8 + threads == suck
      default += ", not :#{e.message[/uncaught throw \`(\w+?)\'/, 1]}"
    rescue ArgumentError => e     # 1.9 exception
      raise e unless e.message.include? "uncaught throw"
      default += ", not #{e.message.split(/ /).last}"
    rescue NameError => e         # 1.8 exception
      raise e unless e.name == sym
      default += ", not #{e.name.inspect}"
    end
    caught = false
  end

  assert caught, message(msg) { default }
  value
rescue Assertion
  raise
rescue => e
  raise UnexpectedError, e
end


  








  

    #capture_io  
  



  

    

Captures $stdout and $stderr into strings:



out, err = capture_io do
  puts "Some info"
  warn "You did a bad thing"
end

assert_match %r%info%, out
assert_match %r%bad%, err



NOTE: For efficiency, this method uses StringIO and does not capture IO for subprocesses. Use #capture_subprocess_io for that.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 538



def capture_io
  _synchronize do
    begin
      captured_stdout, captured_stderr = StringIO.new, StringIO.new

      orig_stdout, orig_stderr = $stdout, $stderr
      $stdout, $stderr         = captured_stdout, captured_stderr

      yield

      return captured_stdout.string, captured_stderr.string
    ensure
      $stdout = orig_stdout
      $stderr = orig_stderr
    end
  end
end


  








  

    #capture_subprocess_io  
  



  

    

Captures $stdout and $stderr into strings, using Tempfile to ensure that subprocess IO is captured as well.



out, err = capture_subprocess_io do
  system "echo Some info"
  system "echo You did a bad thing 1>&2"
end

assert_match %r%info%, out
assert_match %r%bad%, err



NOTE: This method is approximately 10x slower than #capture_io so only use it when you need to test the output of a subprocess.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 571



def capture_subprocess_io
  _synchronize do
    begin
      require "tempfile"

      captured_stdout, captured_stderr = Tempfile.new("out"), Tempfile.new("err")

      orig_stdout, orig_stderr = $stdout.dup, $stderr.dup
      $stdout.reopen captured_stdout
      $stderr.reopen captured_stderr

      yield

      $stdout.rewind
      $stderr.rewind

      return captured_stdout.read, captured_stderr.read
    ensure
      $stdout.reopen orig_stdout
      $stderr.reopen orig_stderr

      orig_stdout.close
      orig_stderr.close
      captured_stdout.close!
      captured_stderr.close!
    end
  end
end


  








  

    #diff(exp, act)  
  



  

    

Returns a diff between exp and act. If there is no known diff command or if it doesn’t make sense to diff the output (single line, short output), then it simply returns a basic comparison between the two.



See #things_to_diff for more info.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 57



def diff exp, act
  result = nil

  expect, butwas = things_to_diff exp, act

  return "Expected: #{mu_pp exp}\n  Actual: #{mu_pp act}" unless
    expect

  Tempfile.open "expect" do |a|
    a.puts expect
    a.flush

    Tempfile.open "butwas" do |b|
      b.puts butwas
      b.flush

      result = `#{Minitest::Assertions.diff} #{a.path} #{b.path}`
      result.sub!(/^\-\-\- .+/, "--- expected")
      result.sub!(/^\\\+ .+/, "+++ actual")

      if result.empty? then
        klass = exp.class
        result = [
                   "No visible difference in the #{klass}#inspect output.\n",
                   "You should look at the implementation of #== on ",
                   "#{klass} or its members.\n",
                   expect,
                 ].join
      end
    end
  end

  result
end


  








  

    #exception_details(e, msg)  
  



  

    

Returns details for exception e


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 603



def exception_details e, msg
  [
    msg,
    "Class: <#{e.class}>",
    "Message: <#{e.message.inspect}>",
    "---Backtrace---",
    Minitest.filter_backtrace(e.backtrace),
    "---------------",
  ].join "\n"
end


  








  

    #fail_after(y, m, d, msg)  
  



  

    

Fails after a given date (in the local time zone). This allows you to put time-bombs in your tests if you need to keep something around until a later date lest you forget about it.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 619



def fail_after y, m, d, msg
  flunk msg if Time.now > Time.local(y, m, d)
end


  








  

    #flunk(msg = nil)  
  



  

    

Fails with msg.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 626



def flunk msg = nil
  msg ||= "Epic Fail!"
  assert false, msg
end


  








  

    #message(msg = nil, ending = nil, &default)  
  



  

    

Returns a proc that will output msg along with the default message.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 634



def message msg = nil, ending = nil, &default
  proc {
    msg = msg.call.chomp(".") if Proc === msg
    custom_message = "#{msg}.\n" unless msg.nil? or msg.to_s.empty?
    "#{custom_message}#{default.call}#{ending || "."}"
  }
end


  








  

    #mu_pp(obj)  
  



  

    

This returns a human-readable version of obj. By default #inspect is called. You can override this to use #pretty_inspect if you want.



See Test.make_my_diffs_pretty!


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 127



def mu_pp obj
  s = obj.inspect.encode Encoding.default_external

  return s unless String === obj &&
    (obj.encoding != Encoding.default_external || !obj.valid_encoding?)

  enc = "# encoding: #{obj.encoding}"
  val = "#    valid: #{obj.valid_encoding?}"

  [enc, val, s].join "\n"
end


  








  

    #mu_pp_for_diff(obj)  
  



  

    

This returns a diff-able more human-readable version of obj. This differs from the regular mu_pp because it expands escaped newlines and makes hex-values (like object_ids) generic. This uses mu_pp to do the first pass and then cleans it up.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 145



def mu_pp_for_diff obj
  str = mu_pp obj

  # both '\n' & '\\n' (_after_ mu_pp (aka inspect))
  single = str.match?(/(?<!\\|^)\\n/)
  double = str.match?(/(?<=\\|^)\\n/)

  process =
    if single ^ double then
      if single then
        lambda { |s| s == "\\n"   ? "\n"    : s } # unescape
      else
        lambda { |s| s == "\\\\n" ? "\\n\n" : s } # unescape a bit, add nls
      end
    else
      :itself                                     # leave it alone
    end

  str
    .gsub(/\\?\\n/, &process)
    .gsub(/:0x[a-fA-F0-9]{4,}/m, ":0xXXXXXX") # anonymize hex values
end


  








  

    #pass(_msg = nil)  
  



  

    

used for counting assertions


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 645



def pass _msg = nil
  assert true
end


  








  

    #refute(test, msg = nil)  
  



  

    

Fails if test is truthy.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 652



def refute test, msg = nil
  msg ||= message { "Expected #{mu_pp test} to not be truthy" }
  assert !test, msg
end


  








  

    #refute_empty(obj, msg = nil)  
  



  

    

Fails if obj is empty.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 660



def refute_empty obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp obj} to not be empty" }
  assert_respond_to obj, :empty?
  refute obj.empty?, msg
end


  








  

    #refute_equal(exp, act, msg = nil)  
  



  

    

Fails if exp == act.



For floats use refute_in_delta.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 671



def refute_equal exp, act, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp act} to not be equal to #{mu_pp exp}"
  }
  refute exp == act, msg
end


  








  

    #refute_in_delta(exp, act, delta = 0.001, msg = nil)  
  



  

    

For comparing Floats.  Fails if exp is within delta of act.



refute_in_delta Math::PI, (22.0 / 7.0)


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 683



def refute_in_delta exp, act, delta = 0.001, msg = nil
  n = (exp - act).abs
  msg = message(msg) {
    "Expected |#{exp} - #{act}| (#{n}) to not be <= #{delta}"
  }
  refute delta >= n, msg
end


  








  

    #refute_in_epsilon(a, b, epsilon = 0.001, msg = nil)  
  



  

    

For comparing Floats.  Fails if exp and act have a relative error less than epsilon.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 695



def refute_in_epsilon a, b, epsilon = 0.001, msg = nil
  refute_in_delta a, b, a * epsilon, msg
end


  








  

    #refute_includes(collection, obj, msg = nil)  
  



  

    

Fails if collection includes obj.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 702



def refute_includes collection, obj, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp collection} to not include #{mu_pp obj}"
  }
  assert_respond_to collection, :include?
  refute collection.include?(obj), msg
end


  








  

    #refute_instance_of(cls, obj, msg = nil)  
  



  

    

Fails if obj is an instance of cls.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 713



def refute_instance_of cls, obj, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp obj} to not be an instance of #{cls}"
  }
  refute obj.instance_of?(cls), msg
end


  








  

    #refute_kind_of(cls, obj, msg = nil)  
  



  

    

Fails if obj is a kind of cls.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 723



def refute_kind_of cls, obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp obj} to not be a kind of #{cls}" }
  refute obj.kind_of?(cls), msg
end


  








  

    #refute_match(matcher, obj, msg = nil)  
  



  

    

Fails if matcher =~ obj.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 731



def refute_match matcher, obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp matcher} to not match #{mu_pp obj}" }
  assert_respond_to matcher, :=~
  matcher = Regexp.new Regexp.escape matcher if String === matcher
  refute matcher =~ obj, msg
end


  








  

    #refute_nil(obj, msg = nil)  
  



  

    

Fails if obj is nil.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 741



def refute_nil obj, msg = nil
  msg = message(msg) { "Expected #{mu_pp obj} to not be nil" }
  refute obj.nil?, msg
end


  








  

    #refute_operator(o1, op, o2 = UNDEFINED, msg = nil)  
  



  

    

Fails if o1 is not op o2. Eg:



refute_operator 1, :>, 2 #=> pass
refute_operator 1, :<, 2 #=> fail


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 776



def refute_operator o1, op, o2 = UNDEFINED, msg = nil
  return refute_predicate o1, op, msg if UNDEFINED == o2
  msg = message(msg) { "Expected #{mu_pp o1} to not be #{op} #{mu_pp o2}" }
  refute o1.__send__(op, o2), msg
end


  








  

    #refute_path_exists(path, msg = nil)  
  



  

    

Fails if path exists.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 785



def refute_path_exists path, msg = nil
  msg = message(msg) { "Expected path '#{path}' to not exist" }
  refute File.exist?(path), msg
end


  








  

    #refute_pattern  
  



  

    

For testing with pattern matching (only supported with Ruby 3.0 and later)



# pass
refute_pattern { [1,2,3] => [String] }

# fail "NoMatchingPatternError expected, but nothing was raised."
refute_pattern { [1,2,3] => [Integer, Integer, Integer] }



This assertion expects a NoMatchingPatternError exception, and will fail if none is raised. Any other exceptions will be raised as normal and generate a test error.


  





  
Raises:


    
  
  • 
    (NotImplementedError)
  
    • 





  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 758



def refute_pattern
  raise NotImplementedError, "only available in Ruby 3.0+" unless RUBY_VERSION >= "3.0"
  flunk "refute_pattern requires a block to capture errors." unless block_given?

  begin
    yield
    flunk "NoMatchingPatternError expected, but nothing was raised."
  rescue NoMatchingPatternError
    pass
  end
end


  








  

    #refute_predicate(o1, op, msg = nil)  
  



  

    

For testing with predicates.



refute_predicate str, :empty?



This is really meant for specs and is front-ended by refute_operator:



str.wont_be :empty?


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 799



def refute_predicate o1, op, msg = nil
  msg = message(msg) { "Expected #{mu_pp o1} to not be #{op}" }
  refute o1.__send__(op), msg
end


  








  

    #refute_respond_to(obj, meth, msg = nil, include_all: false)  
  



  

    

Fails if obj responds to the message meth. include_all defaults to false to match Object#respond_to?


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 808



def refute_respond_to obj, meth, msg = nil, include_all: false
  msg = message(msg) { "Expected #{mu_pp obj} to not respond to #{meth}" }

  refute obj.respond_to?(meth, include_all), msg
end


  








  

    #refute_same(exp, act, msg = nil)  
  



  

    

Fails if exp is the same (by object identity) as act.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 817



def refute_same exp, act, msg = nil
  msg = message(msg) {
    data = [mu_pp(act), act.object_id, mu_pp(exp), exp.object_id]
    "Expected %s (oid=%d) to not be the same as %s (oid=%d)" % data
  }
  refute exp.equal?(act), msg
end


  








  

    #skip(msg = nil, _ignored = nil)  
  



  

    

Skips the current run. If run in verbose-mode, the skipped run gets listed at the end of the run but doesn’t cause a failure exit code.


  





  
Raises:





  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 830



def skip msg = nil, _ignored = nil
  msg ||= "Skipped, no message given"
  @skip = true
  raise Minitest::Skip, msg
end


  








  

    #skip_until(y, m, d, msg)  
  



  

    

Skips the current run until a given date (in the local time zone). This allows you to put some fixes on hold until a later date, but still holds you accountable and prevents you from forgetting it.


  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 842



def skip_until y, m, d, msg
  skip msg if Time.now < Time.local(y, m, d)
  where = caller(1..1).first.rpartition(":in").reject(&:empty?).first
  warn "Stale skip_until %p at %s" % [msg, where]
end


  








  

    #things_to_diff(exp, act)  
  



  

    

Returns things to diff [expect, butwas], or [nil, nil] if nothing to diff.



Criterion:


  1. 

    Strings include newlines or escaped newlines, but not both.
    

  2. 

    or:  String lengths are > 30 characters.
    

  3. 

    or:  Strings are equal to each other (but maybe different encodings?).
    

  4. 

    and: we found a diff executable.
    



  



  [ GitHub ]


  

  


# File 'lib/minitest/assertions.rb', line 102



def things_to_diff exp, act
  expect = mu_pp_for_diff exp
  butwas = mu_pp_for_diff act

  e1, e2 = expect.include?("\n"), expect.include?("\\n")
  b1, b2 = butwas.include?("\n"), butwas.include?("\\n")

  need_to_diff =
    (e1 ^ e2                  ||
     b1 ^ b2                  ||
     expect.size > 30         ||
     butwas.size > 30         ||
     expect == butwas)        &&
    Minitest::Assertions.diff

  need_to_diff && [expect, butwas]
end