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assertions.rb
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assertions.rb
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require "rbconfig"
require "tempfile"
require "stringio"
module Minitest
##
# 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 Minitest::Runnable
# for an example.
module Assertions
UNDEFINED = Object.new # :nodoc:
def UNDEFINED.inspect # :nodoc:
"UNDEFINED" # again with the rdoc bugs... :(
end
##
# Returns the diff command to use in #diff. Tries to intelligently
# figure out what diff to use.
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
##
# Set the diff command to use in #diff.
def self.diff= o
@diff = o
end
##
# 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.
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
##
# 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.
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
##
# 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 Minitest::Test.make_my_diffs_pretty!
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
##
# 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.
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
##
# Fails unless +test+ is truthy.
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
def _synchronize # :nodoc:
yield
end
##
# Fails unless +obj+ is empty.
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
def _where # :nodoc:
Minitest.filter_backtrace(caller).first
.split(":in ", 2).first # clean up noise
end
E = "" # :nodoc:
##
# Fails unless <tt>exp == act</tt> 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
# Minitest::Test.make_my_diffs_pretty!
#
# For floats use assert_in_delta.
#
# See also: Minitest::Assertions.diff
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
##
# 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
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
##
# For comparing Floats. Fails unless +exp+ and +act+ have a relative
# error less than +epsilon+.
def assert_in_epsilon exp, act, epsilon = 0.001, msg = nil
assert_in_delta exp, act, [exp.abs, act.abs].min * epsilon, msg
end
##
# Fails unless +collection+ includes +obj+.
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
##
# Fails unless +obj+ is an instance of +cls+.
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
##
# Fails unless +obj+ is a kind of +cls+.
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
##
# Fails unless +matcher+ <tt>=~</tt> +obj+.
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
##
# Fails unless +obj+ is nil
def assert_nil obj, msg = nil
msg = message(msg) { "Expected #{mu_pp obj} to be nil" }
assert obj.nil?, msg
end
##
# For testing with binary operators. Eg:
#
# assert_operator 5, :<=, 4
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
##
# 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
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
##
# Fails unless +path+ exists.
def assert_path_exists path, msg = nil
msg = message(msg) { "Expected path '#{path}' to exist" }
assert File.exist?(path), msg
end
##
# 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 <tt>=></tt> 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.
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
##
# 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?
def assert_predicate o1, op, msg = nil
msg = message(msg) { "Expected #{mu_pp o1} to be #{op}" }
assert o1.__send__(op), msg
end
##
# 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
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
##
# Fails unless +obj+ responds to +meth+.
# include_all defaults to false to match Object#respond_to?
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
##
# Fails unless +exp+ and +act+ are #equal?
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
##
# +send_ary+ is a receiver, message and arguments.
#
# Fails unless the call returns a true value
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
##
# Fails if the block outputs anything to stderr or stdout.
#
# See also: #assert_output
def assert_silent
assert_output "", "" do
yield
end
end
##
# Fails unless the block throws +sym+
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
##
# 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.
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
##
# 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.
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
##
# Returns details for exception +e+
def exception_details e, msg
[
msg,
"Class: <#{e.class}>",
"Message: <#{e.message.inspect}>",
"---Backtrace---",
Minitest.filter_backtrace(e.backtrace),
"---------------",
].join "\n"
end
##
# 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.
def fail_after y, m, d, msg
flunk msg if Time.now > Time.local(y, m, d)
end
##
# Fails with +msg+.
def flunk msg = nil
msg ||= "Epic Fail!"
assert false, msg
end
##
# Returns a proc that will output +msg+ along with the default message.
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
##
# used for counting assertions
def pass _msg = nil
assert true
end
##
# Fails if +test+ is truthy.
def refute test, msg = nil
msg ||= message { "Expected #{mu_pp test} to not be truthy" }
assert !test, msg
end
##
# Fails if +obj+ is empty.
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
##
# Fails if <tt>exp == act</tt>.
#
# For floats use refute_in_delta.
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
##
# For comparing Floats. Fails if +exp+ is within +delta+ of +act+.
#
# refute_in_delta Math::PI, (22.0 / 7.0)
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
##
# For comparing Floats. Fails if +exp+ and +act+ have a relative error
# less than +epsilon+.
def refute_in_epsilon a, b, epsilon = 0.001, msg = nil
refute_in_delta a, b, a * epsilon, msg
end
##
# Fails if +collection+ includes +obj+.
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
##
# Fails if +obj+ is an instance of +cls+.
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
##
# Fails if +obj+ is a kind of +cls+.
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
##
# Fails if +matcher+ <tt>=~</tt> +obj+.
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
##
# Fails if +obj+ is nil.
def refute_nil obj, msg = nil
msg = message(msg) { "Expected #{mu_pp obj} to not be nil" }
refute obj.nil?, msg
end
##
# 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.
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
##
# Fails if +o1+ is not +op+ +o2+. Eg:
#
# refute_operator 1, :>, 2 #=> pass
# refute_operator 1, :<, 2 #=> fail
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
##
# Fails if +path+ exists.
def refute_path_exists path, msg = nil
msg = message(msg) { "Expected path '#{path}' to not exist" }
refute File.exist?(path), msg
end
##
# 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?
def refute_predicate o1, op, msg = nil
msg = message(msg) { "Expected #{mu_pp o1} to not be #{op}" }
refute o1.__send__(op), msg
end
##
# Fails if +obj+ responds to the message +meth+.
# include_all defaults to false to match Object#respond_to?
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
##
# Fails if +exp+ is the same (by object identity) as +act+.
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
##
# 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.
def skip msg = nil, _ignored = nil
msg ||= "Skipped, no message given"
@skip = true
raise Minitest::Skip, msg
end
##
# 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.
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
##
# Was this testcase skipped? Meant for #teardown.
def skipped?
defined?(@skip) and @skip
end
end
end