Module: Minitest::Assertions
Relationships & Source Files | |
Extension / Inclusion / Inheritance Descendants | |
Included In:
| |
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
-
E =
Internal use only
# File 'lib/minitest/assertions.rb', line 157""
-
UNDEFINED =
Internal use only
# File 'lib/minitest/assertions.rb', line 19Object.new
Class Attribute Summary
Instance Attribute Summary
-
#skipped? ⇒ Boolean
readonly
Was this testcase skipped? Meant for
#teardown
.
Instance Method Summary
-
#assert(test, msg = nil)
Fails unless
test
is truthy. -
#assert_empty(obj, msg = nil)
Fails unless
obj
is empty. -
#assert_equal(exp, act, msg = nil)
Fails unless
exp == act
printing the difference between the two, if possible. -
#assert_in_delta(exp, act, delta = 0.001, msg = nil)
For comparing Floats.
-
#assert_in_epsilon(exp, act, epsilon = 0.001, msg = nil)
For comparing Floats.
-
#assert_includes(collection, obj, msg = nil)
Fails unless
collection
includesobj
. -
#assert_instance_of(cls, obj, msg = nil)
Fails unless
obj
is an instance ofcls
. -
#assert_kind_of(cls, obj, msg = nil)
Fails unless
obj
is a kind ofcls
. -
#assert_match(matcher, obj, msg = nil)
Fails unless
matcher
=~
obj
. -
#assert_mock(mock)
Assert that the mock verifies correctly.
-
#assert_nil(obj, msg = nil)
Fails unless
obj
is nil. -
#assert_operator(o1, op, o2 = UNDEFINED, msg = nil)
For testing with binary operators.
-
#assert_output(stdout = nil, stderr = nil)
Fails if stdout or stderr do not output the expected results.
-
#assert_predicate(o1, op, msg = nil)
For testing with predicates.
-
#assert_raises(*exp)
Fails unless the block raises one of
exp
. -
#assert_respond_to(obj, meth, msg = nil)
Fails unless
obj
responds tometh
. -
#assert_same(exp, act, msg = nil)
Fails unless
exp
andact
are#equal?
-
#assert_send(send_ary, m = nil)
send_ary
is a receiver, message and arguments. -
#assert_silent
Fails if the block outputs anything to stderr or stdout.
-
#assert_throws(sym, msg = nil)
Fails unless the block throws
sym
-
#capture_io
Captures $stdout and $stderr into strings:
-
#capture_subprocess_io
Captures $stdout and $stderr into strings, using Tempfile to ensure that subprocess IO is captured as well.
-
#diff(exp, act)
Returns a diff between
exp
andact
. -
#exception_details(e, msg)
Returns details for exception
e
-
#flunk(msg = nil)
Fails with
msg
-
#message(msg = nil, ending = nil, &default)
Returns a proc that will output
msg
along with the default message. -
#mu_pp(obj)
This returns a human-readable version of
obj
. -
#mu_pp_for_diff(obj)
This returns a diff-able human-readable version of
obj
. -
#pass(_msg = nil)
used for counting assertions.
-
#refute(test, msg = nil)
Fails if
test
is truthy. -
#refute_empty(obj, msg = nil)
Fails if
obj
is empty. -
#refute_equal(exp, act, msg = nil)
Fails if
exp == act
. -
#refute_in_delta(exp, act, delta = 0.001, msg = nil)
For comparing Floats.
-
#refute_in_epsilon(a, b, epsilon = 0.001, msg = nil)
For comparing Floats.
-
#refute_includes(collection, obj, msg = nil)
Fails if
collection
includesobj
. -
#refute_instance_of(cls, obj, msg = nil)
Fails if
obj
is an instance ofcls
. -
#refute_kind_of(cls, obj, msg = nil)
Fails if
obj
is a kind ofcls
. -
#refute_match(matcher, obj, msg = nil)
Fails if
matcher
=~
obj
. -
#refute_nil(obj, msg = nil)
Fails if
obj
is nil. -
#refute_operator(o1, op, o2 = UNDEFINED, msg = nil)
Fails if
o1
is notop
o2
. -
#refute_predicate(o1, op, msg = nil)
For testing with predicates.
-
#refute_respond_to(obj, meth, msg = nil)
Fails if
obj
responds to the messagemeth
. -
#refute_same(exp, act, msg = nil)
Fails if
exp
is the same (by object identity) asact
. -
#skip(msg = nil, bt = caller)
Skips the current run.
- #_synchronize Internal use only
Class Attribute Details
.diff (rw)
Returns the diff command to use in #diff. Tries to intelligently figure out what diff to use.
# File 'lib/minitest/assertions.rb', line 29
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) (rw)
Set the diff command to use in #diff.
# File 'lib/minitest/assertions.rb', line 49
def self.diff= o @diff = o end
Instance Attribute Details
#skipped? ⇒ Boolean
(readonly)
Was this testcase skipped? Meant for #teardown
.
# File 'lib/minitest/assertions.rb', line 689
def skipped? defined?(@skip) and @skip end
Instance Method Details
#_synchronize
# File 'lib/minitest/assertions.rb', line 144
def _synchronize # :nodoc: yield end
#assert(test, msg = nil)
Fails unless test
is truthy.
#assert_empty(obj, msg = nil)
Fails unless obj
is empty.
# File 'lib/minitest/assertions.rb', line 151
def assert_empty obj, msg = nil msg = (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
# File 'lib/minitest/assertions.rb', line 172
def assert_equal exp, act, msg = nil msg = (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 where = Minitest.filter_backtrace(caller).first where = where.split(/:in /, 2).first # clean up noise 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
# File 'lib/minitest/assertions.rb', line 196
def assert_in_delta exp, act, delta = 0.001, msg = nil n = (exp - act).abs msg = (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
.
# File 'lib/minitest/assertions.rb', line 208
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
.
# File 'lib/minitest/assertions.rb', line 215
def assert_includes collection, obj, msg = nil msg = (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
.
#assert_kind_of(cls, obj, msg = nil)
Fails unless obj
is a kind of cls
.
#assert_match(matcher, obj, msg = nil)
Fails unless matcher
=~
obj
.
# File 'lib/minitest/assertions.rb', line 247
def assert_match matcher, obj, msg = nil msg = (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_mock(mock)
Assert that the mock verifies correctly.
# File 'lib/minitest/mock.rb', line 184
def assert_mock mock assert mock.verify end
#assert_nil(obj, msg = nil)
Fails unless obj
is nil
#assert_operator(o1, op, o2 = UNDEFINED, msg = nil)
For testing with binary operators. Eg:
assert_operator 5, :<=, 4
#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
# File 'lib/minitest/assertions.rb', line 285
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)
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?
#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.
# File 'lib/minitest/assertions.rb', line 321
def assert_raises *exp 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::Skip, Minitest::Assertion # 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)
Fails unless obj
responds to meth
.
#assert_same(exp, act, msg = nil)
Fails unless exp
and act
are #equal?
#assert_send(send_ary, m = nil)
send_ary
is a receiver, message and arguments.
Fails unless the call returns a true value
# File 'lib/minitest/assertions.rb', line 372
def assert_send send_ary, m = nil where = Minitest.filter_backtrace(caller).first where = where.split(/:in /, 2).first # clean up noise warn "DEPRECATED: assert_send. From #{where}" recv, msg, *args = send_ary m = (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
# File 'lib/minitest/assertions.rb', line 388
def assert_silent assert_output "", "" do yield end end
#assert_throws(sym, msg = nil)
Fails unless the block throws sym
# File 'lib/minitest/assertions.rb', line 397
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. [/uncaught throw \`(\w+?)\'/, 1]}" rescue ArgumentError => e # 1.9 exception raise e unless e. .include?("uncaught throw") default += ", not #{e. .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, (msg) { default } 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.
# File 'lib/minitest/assertions.rb', line 433
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.
# File 'lib/minitest/assertions.rb', line 466
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 captured_stdout.unlink captured_stderr.unlink $stdout.reopen orig_stdout $stderr.reopen orig_stderr 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.
# File 'lib/minitest/assertions.rb', line 59
def diff exp, act expect = mu_pp_for_diff exp butwas = mu_pp_for_diff act result = nil need_to_diff = (expect.include?("\n") || butwas.include?("\n") || expect.size > 30 || butwas.size > 30 || expect == butwas) && Minitest::Assertions.diff 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)
Returns details for exception e
# File 'lib/minitest/assertions.rb', line 495
def exception_details e, msg [ "#{msg}", "Class: <#{e.class}>", "Message: <#{e. .inspect}>", "---Backtrace---", "#{Minitest.filter_backtrace(e.backtrace).join("\n")}", "---------------", ].join "\n" end
#flunk(msg = nil)
Fails with msg
# File 'lib/minitest/assertions.rb', line 509
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.
# File 'lib/minitest/assertions.rb', line 517
def msg = nil, ending = nil, &default proc { msg = msg.call.chomp(".") if Proc === msg = "#{msg}.\n" unless msg.nil? or msg.to_s.empty? "#{}#{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_print
if you want.
# File 'lib/minitest/assertions.rb', line 107
def mu_pp obj s = obj.inspect if defined? Encoding then s = s.encode Encoding.default_external if String === obj && obj.encoding != Encoding.default_external then s = "# encoding: #{obj.encoding}\n#{s}" end end s end
#mu_pp_for_diff(obj)
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.
# File 'lib/minitest/assertions.rb', line 127
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)
used for counting assertions
# File 'lib/minitest/assertions.rb', line 528
def pass _msg = nil assert true end
#refute(test, msg = nil)
Fails if test
is truthy.
#refute_empty(obj, msg = nil)
Fails if obj
is empty.
# File 'lib/minitest/assertions.rb', line 543
def refute_empty obj, msg = nil msg = (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.
#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)
# File 'lib/minitest/assertions.rb', line 566
def refute_in_delta exp, act, delta = 0.001, msg = nil n = (exp - act).abs msg = (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
.
# File 'lib/minitest/assertions.rb', line 578
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
.
# File 'lib/minitest/assertions.rb', line 585
def refute_includes collection, obj, msg = nil msg = (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
.
#refute_kind_of(cls, obj, msg = nil)
Fails if obj
is a kind of cls
.
#refute_match(matcher, obj, msg = nil)
Fails if matcher
=~
obj
.
# File 'lib/minitest/assertions.rb', line 614
def refute_match matcher, obj, msg = nil msg = (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.
#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
#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?
#refute_respond_to(obj, meth, msg = nil)
Fails if obj
responds to the message meth
.
#refute_same(exp, act, msg = nil)
Fails if exp
is the same (by object identity) as act
.
#skip(msg = nil, bt = caller)
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.