Module: Minitest::Assertions

Included in:
Test
Defined in:
lib/minitest/assertions.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 variable named assertions. This is not provided by Assertions and must be provided by the thing including Assertions. See Minitest::Runnable for an example.

Constant Summary collapse

UNDEFINED =

:nodoc:

Object.new

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.diff ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 25

def self.diff
  @diff = if (RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ &&
              system("diff.exe", __FILE__, __FILE__)) then
            "diff.exe -u"
          elsif Minitest::Test.maglev? then
            "diff -u"
          elsif system("gdiff", __FILE__, __FILE__)
            "gdiff -u" # solaris and kin suck
          elsif system("diff", __FILE__, __FILE__)
            "diff -u"
          else
            nil
          end unless defined? @diff

  @diff
end

.diff=(o) ⇒ Object

Set the diff command to use in #diff.



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

def self.diff= o
  @diff = o
end

Instance Method Details

#assert(test, msg = nil) ⇒ Object

Fails unless test is truthy.



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# File 'lib/minitest/assertions.rb', line 124

def assert test, msg = nil
  msg ||= "Failed assertion, no message given."
  self.assertions += 1
  unless test then
    msg = msg.call if Proc === msg
    raise Minitest::Assertion, msg
  end
  true
end

#assert_empty(obj, msg = nil) ⇒ Object

Fails unless obj is empty.



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# File 'lib/minitest/assertions.rb', line 137

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) ⇒ Object

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 floats use assert_in_delta.

See also: Minitest::Assertions.diff



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# File 'lib/minitest/assertions.rb', line 155

def assert_equal exp, act, msg = nil
  msg = message(msg, "") { diff exp, act }
  assert exp == act, msg
end

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

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



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# File 'lib/minitest/assertions.rb', line 166

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(a, b, epsilon = 0.001, msg = nil) ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 178

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

#assert_includes(collection, obj, msg = nil) ⇒ Object

Fails unless collection includes obj.



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# File 'lib/minitest/assertions.rb', line 185

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) ⇒ Object

Fails unless obj is an instance of cls.



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# File 'lib/minitest/assertions.rb', line 196

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) ⇒ Object

Fails unless obj is a kind of cls.



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# File 'lib/minitest/assertions.rb', line 207

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) ⇒ Object

Fails unless matcher =~ obj.



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# File 'lib/minitest/assertions.rb', line 217

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
end

#assert_nil(obj, msg = nil) ⇒ Object

Fails unless obj is nil



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# File 'lib/minitest/assertions.rb', line 227

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) ⇒ Object

For testing with binary operators. Eg:

assert_operator 5, :<=, 4



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# File 'lib/minitest/assertions.rb', line 237

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) ⇒ Object

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.

NOTE: this uses #capture_io, not #capture_subprocess_io.

See also: #assert_silent



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

def assert_output stdout = nil, stderr = nil
  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)
end

#assert_predicate(o1, op, msg = nil) ⇒ Object

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?



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

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) ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 285

def assert_raises *exp
  msg = "#{exp.pop}.\n" if String === exp.last

  begin
    yield
  rescue Minitest::Skip => e
    return e if exp.include? Minitest::Skip
    raise e
  rescue Exception => e
    expected = exp.any? { |ex|
      if ex.instance_of? Module then
        e.kind_of? ex
      else
        e.instance_of? ex
      end
    }

    assert expected, proc {
      exception_details(e, "#{msg}#{mu_pp(exp)} exception expected, not")
    }

    return e
  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) ⇒ Object

Fails unless obj responds to meth.



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# File 'lib/minitest/assertions.rb', line 317

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

#assert_same(exp, act, msg = nil) ⇒ Object

Fails unless exp and act are #equal?



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

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) ⇒ Object

send_ary is a receiver, message and arguments.

Fails unless the call returns a true value



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# File 'lib/minitest/assertions.rb', line 340

def assert_send send_ary, m = nil
  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 ⇒ Object

Fails if the block outputs anything to stderr or stdout.

See also: #assert_output



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# File 'lib/minitest/assertions.rb', line 352

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

#assert_throws(sym, msg = nil) ⇒ Object

Fails unless the block throws sym



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# File 'lib/minitest/assertions.rb', line 361

def assert_throws sym, msg = nil
  default = "Expected #{mu_pp(sym)} to have been thrown"
  caught = true
  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
      default += ", not #{e.message.split(/ /).last}"
    rescue NameError => e         # 1.8 exception
      default += ", not #{e.name.inspect}"
    end
    caught = false
  end

  assert caught, message(msg) { default }
end

#capture_io ⇒ Object

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.



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# File 'lib/minitest/assertions.rb', line 395

def capture_io
  require 'stringio'

  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

#capture_subprocess_io ⇒ Object

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.



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# File 'lib/minitest/assertions.rb', line 426

def capture_subprocess_io
  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
  captured_stdout.unlink
  captured_stderr.unlink
  $stdout.reopen orig_stdout
  $stderr.reopen orig_stderr
end

#diff(exp, act) ⇒ Object

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.



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# File 'lib/minitest/assertions.rb', line 55

def diff exp, act
  require "tempfile"

  expect = mu_pp_for_diff exp
  butwas = mu_pp_for_diff act
  result = nil

  need_to_diff =
    Minitest::Assertions.diff &&
    (expect.include?("\n")    ||
     butwas.include?("\n")    ||
     expect.size > 30         ||
     butwas.size > 30         ||
     expect == butwas)

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

  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) ⇒ Object

Returns details for exception e



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# File 'lib/minitest/assertions.rb', line 451

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

#flunk(msg = nil) ⇒ Object

Fails with msg



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# File 'lib/minitest/assertions.rb', line 465

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

#message(msg = nil, ending = ".", &default) ⇒ Object

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



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

def message msg = nil, ending = ".", &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) ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 105

def mu_pp obj
  s = obj.inspect
  s = s.encode Encoding.default_external if defined? Encoding
  s
end

#mu_pp_for_diff(obj) ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 117

def mu_pp_for_diff obj
  mu_pp(obj).gsub(/\\n/, "\n").gsub(/:0x[a-fA-F0-9]{4,}/m, ':0xXXXXXX')
end

#pass(msg = nil) ⇒ Object

used for counting assertions



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# File 'lib/minitest/assertions.rb', line 484

def pass msg = nil
  assert true
end

#refute(test, msg = nil) ⇒ Object

Fails if test is truthy.



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# File 'lib/minitest/assertions.rb', line 491

def refute test, msg = nil
  msg ||= "Failed refutation, no message given"
  not assert(! test, msg)
end

#refute_empty(obj, msg = nil) ⇒ Object

Fails if obj is empty.



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# File 'lib/minitest/assertions.rb', line 499

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) ⇒ Object

Fails if exp == act.

For floats use refute_in_delta.



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# File 'lib/minitest/assertions.rb', line 510

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) ⇒ Object

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

refute_in_delta Math::PI, (22.0 / 7.0)



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# File 'lib/minitest/assertions.rb', line 522

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) ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 534

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) ⇒ Object

Fails if collection includes obj.



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# File 'lib/minitest/assertions.rb', line 541

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) ⇒ Object

Fails if obj is an instance of cls.



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# File 'lib/minitest/assertions.rb', line 552

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) ⇒ Object

Fails if obj is a kind of cls.



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# File 'lib/minitest/assertions.rb', line 562

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) ⇒ Object

Fails if matcher =~ obj.



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# File 'lib/minitest/assertions.rb', line 570

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) ⇒ Object

Fails if obj is nil.



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# File 'lib/minitest/assertions.rb', line 580

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) ⇒ Object

Fails if o1 is not op o2. Eg:

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



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# File 'lib/minitest/assertions.rb', line 591

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_predicate(o1, op, msg = nil) ⇒ Object

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?



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# File 'lib/minitest/assertions.rb', line 606

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) ⇒ Object

Fails if obj responds to the message meth.



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# File 'lib/minitest/assertions.rb', line 614

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

  refute obj.respond_to?(meth), msg
end

#refute_same(exp, act, msg = nil) ⇒ Object

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



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# File 'lib/minitest/assertions.rb', line 623

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, bt = caller) ⇒ Object

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:



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# File 'lib/minitest/assertions.rb', line 636

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

#skipped? ⇒ Boolean

Was this testcase skipped? Meant for #teardown.

Returns:

  • (Boolean) 


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

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