Module: MiniTest::Assertions
- Included in:
- Unit::TestCase
- Defined in:
- lib/minitest/unit.rb
Overview
MiniTest Assertions. All assertion methods accept a msg
which is printed if the assertion fails.
Constant Summary collapse
- UNDEFINED =
:nodoc:
Object.new
Class Method Summary collapse
-
.diff ⇒ Object
Returns the diff command to use in #diff.
-
.diff=(o) ⇒ Object
Set the diff command to use in #diff.
Instance Method Summary collapse
-
#_assertions ⇒ Object
:nodoc:.
-
#_assertions=(n) ⇒ Object
:nodoc:.
-
#assert(test, msg = nil) ⇒ Object
Fails unless
test
is a true value. -
#assert_block(msg = nil) ⇒ Object
Fails unless the block returns a true value.
-
#assert_empty(obj, msg = nil) ⇒ Object
Fails unless
obj
is empty. -
#assert_equal(exp, act, msg = nil) ⇒ Object
Fails unless
exp == act
printing the difference between the two, if possible. -
#assert_in_delta(exp, act, delta = 0.001, msg = nil) ⇒ Object
For comparing Floats.
-
#assert_in_epsilon(a, b, epsilon = 0.001, msg = nil) ⇒ Object
For comparing Floats.
-
#assert_includes(collection, obj, msg = nil) ⇒ Object
Fails unless
collection
includesobj
. -
#assert_instance_of(cls, obj, msg = nil) ⇒ Object
Fails unless
obj
is an instance ofcls
. -
#assert_kind_of(cls, obj, msg = nil) ⇒ Object
Fails unless
obj
is a kind ofcls
. -
#assert_match(matcher, obj, msg = nil) ⇒ Object
Fails unless
matcher
=~
obj
. -
#assert_nil(obj, msg = nil) ⇒ Object
Fails unless
obj
is nil. -
#assert_operator(o1, op, o2 = UNDEFINED, msg = nil) ⇒ Object
For testing with binary operators.
-
#assert_output(stdout = nil, stderr = nil) ⇒ Object
Fails if stdout or stderr do not output the expected results.
-
#assert_predicate(o1, op, msg = nil) ⇒ Object
For testing with predicates.
-
#assert_raises(*exp) ⇒ Object
Fails unless the block raises one of
exp
. -
#assert_respond_to(obj, meth, msg = nil) ⇒ Object
Fails unless
obj
responds tometh
. -
#assert_same(exp, act, msg = nil) ⇒ Object
Fails unless
exp
andact
are #equal?. -
#assert_send(send_ary, m = nil) ⇒ Object
send_ary
is a receiver, message and arguments. -
#assert_silent ⇒ Object
Fails if the block outputs anything to stderr or stdout.
-
#assert_throws(sym, msg = nil) ⇒ Object
Fails unless the block throws
sym
. -
#capture_io ⇒ Object
Captures $stdout and $stderr into strings:.
-
#capture_subprocess_io ⇒ Object
Captures $stdout and $stderr into strings, using Tempfile to ensure that subprocess IO is captured as well.
-
#diff(exp, act) ⇒ Object
Returns a diff between
exp
andact
. -
#exception_details(e, msg) ⇒ Object
Returns details for exception
e
. -
#flunk(msg = nil) ⇒ Object
Fails with
msg
. -
#message(msg = nil, ending = ".", &default) ⇒ Object
Returns a proc that will output
msg
along with the default message. -
#mu_pp(obj) ⇒ Object
This returns a human-readable version of
obj
. -
#mu_pp_for_diff(obj) ⇒ Object
This returns a diff-able human-readable version of
obj
. -
#pass(msg = nil) ⇒ Object
used for counting assertions.
-
#refute(test, msg = nil) ⇒ Object
Fails if
test
is a true value. -
#refute_empty(obj, msg = nil) ⇒ Object
Fails if
obj
is empty. -
#refute_equal(exp, act, msg = nil) ⇒ Object
Fails if
exp == act
. -
#refute_in_delta(exp, act, delta = 0.001, msg = nil) ⇒ Object
For comparing Floats.
-
#refute_in_epsilon(a, b, epsilon = 0.001, msg = nil) ⇒ Object
For comparing Floats.
-
#refute_includes(collection, obj, msg = nil) ⇒ Object
Fails if
collection
includesobj
. -
#refute_instance_of(cls, obj, msg = nil) ⇒ Object
Fails if
obj
is an instance ofcls
. -
#refute_kind_of(cls, obj, msg = nil) ⇒ Object
Fails if
obj
is a kind ofcls
. -
#refute_match(matcher, obj, msg = nil) ⇒ Object
Fails if
matcher
=~
obj
. -
#refute_nil(obj, msg = nil) ⇒ Object
Fails if
obj
is nil. -
#refute_operator(o1, op, o2 = UNDEFINED, msg = nil) ⇒ Object
Fails if
o1
is notop
o2
. -
#refute_predicate(o1, op, msg = nil) ⇒ Object
For testing with predicates.
-
#refute_respond_to(obj, meth, msg = nil) ⇒ Object
Fails if
obj
responds to the messagemeth
. -
#refute_same(exp, act, msg = nil) ⇒ Object
Fails if
exp
is the same (by object identity) asact
. -
#skip(msg = nil, bt = caller) ⇒ Object
Skips the current test.
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/unit.rb', line 80 def self.diff @diff = if RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ then "diff.exe -u" else if system("gdiff", __FILE__, __FILE__) "gdiff -u" # solaris and kin suck elsif system("diff", __FILE__, __FILE__) "diff -u" else nil end end unless defined? @diff @diff end |
.diff=(o) ⇒ Object
Set the diff command to use in #diff.
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# File 'lib/minitest/unit.rb', line 99 def self.diff= o @diff = o end |
Instance Method Details
#_assertions ⇒ Object
:nodoc:
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# File 'lib/minitest/unit.rb', line 178 def _assertions # :nodoc: @_assertions ||= 0 end |
#_assertions=(n) ⇒ Object
:nodoc:
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# File 'lib/minitest/unit.rb', line 174 def _assertions= n # :nodoc: @_assertions = n end |
#assert(test, msg = nil) ⇒ Object
Fails unless test
is a true value.
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# File 'lib/minitest/unit.rb', line 185 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_block(msg = nil) ⇒ Object
Fails unless the block returns a true value.
NOTE: This method is deprecated, use assert. It will be removed on 2013-01-01.“
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# File 'lib/minitest/unit.rb', line 201 def assert_block msg = nil warn "NOTE: MiniTest::Unit::TestCase#assert_block is deprecated, use assert. It will be removed on 2013-01-01. Called from #{caller.first}" msg = (msg) { "Expected block to return true value" } assert yield, msg end |
#assert_empty(obj, msg = nil) ⇒ Object
Fails unless obj
is empty.
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# File 'lib/minitest/unit.rb', line 210 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) ⇒ 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/unit.rb', line 228 def assert_equal exp, act, msg = nil msg = (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/unit.rb', line 239 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(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/unit.rb', line 249 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/unit.rb', line 256 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) ⇒ Object
Fails unless obj
is an instance of cls
.
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# File 'lib/minitest/unit.rb', line 267 def assert_instance_of cls, obj, msg = nil msg = (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/unit.rb', line 278 def assert_kind_of cls, obj, msg = nil # TODO: merge with instance_of msg = (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/unit.rb', line 288 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_nil(obj, msg = nil) ⇒ Object
Fails unless obj
is nil
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# File 'lib/minitest/unit.rb', line 298 def assert_nil obj, msg = nil msg = (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.
assert_operator 5, :<=, 4
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# File 'lib/minitest/unit.rb', line 308 def assert_operator o1, op, o2 = UNDEFINED, msg = nil return assert_predicate o1, op, msg if UNDEFINED == o2 msg = (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/unit.rb', line 324 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.
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/unit.rb', line 347 def assert_predicate o1, op, msg = nil msg = (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/unit.rb', line 356 def assert_raises *exp msg = "#{exp.pop}.\n" if String === exp.last should_raise = false begin yield should_raise = true rescue MiniTest::Skip => e details = "#{msg}#{mu_pp(exp)} exception expected, not" if exp.include? MiniTest::Skip then return e else raise e end rescue Exception => e details = "#{msg}#{mu_pp(exp)} exception expected, not" assert(exp.any? { |ex| ex.instance_of?(Module) ? e.kind_of?(ex) : ex == e.class }, exception_details(e, details)) return e end exp = exp.first if exp.size == 1 flunk "#{msg}#{mu_pp(exp)} expected but nothing was raised." if should_raise end |
#assert_respond_to(obj, meth, msg = nil) ⇒ Object
Fails unless obj
responds to meth
.
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# File 'lib/minitest/unit.rb', line 388 def assert_respond_to obj, meth, msg = nil msg = (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/unit.rb', line 398 def assert_same exp, act, msg = nil msg = (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 TODO: I should prolly remove this from specs
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# File 'lib/minitest/unit.rb', line 412 def assert_send send_ary, m = nil 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 ⇒ Object
Fails if the block outputs anything to stderr or stdout.
See also: #assert_output
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# File 'lib/minitest/unit.rb', line 424 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/unit.rb', line 433 def assert_throws sym, msg = nil default = "Expected #{mu_pp(sym)} to have been thrown" caught = true catch(sym) do begin yield rescue ArgumentError => e # 1.9 exception default += ", not #{e..split(/ /).last}" rescue NameError => e # 1.8 exception default += ", not #{e.name.inspect}" end caught = false end assert caught, (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/unit.rb', line 465 def capture_io require 'stringio' orig_stdout, orig_stderr = $stdout, $stderr captured_stdout, captured_stderr = StringIO.new, StringIO.new $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/unit.rb', line 495 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/unit.rb', line 109 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.", "You should look at your implementation of #{klass}#==.", expect ].join "\n" end end end result end |
#exception_details(e, msg) ⇒ Object
Returns details for exception e
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# File 'lib/minitest/unit.rb', line 519 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) ⇒ Object
Fails with msg
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# File 'lib/minitest/unit.rb', line 533 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/unit.rb', line 541 def msg = nil, ending = ".", &default proc { = "#{msg}.\n" unless msg.nil? or msg.to_s.empty? "#{}#{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/unit.rb', line 158 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/unit.rb', line 170 def mu_pp_for_diff obj # TODO: possibly rename mu_pp(obj).gsub(/\\n/, "\n").gsub(/0x[a-f0-9]+/m, '0xXXXXXX') end |
#pass(msg = nil) ⇒ Object
used for counting assertions
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# File 'lib/minitest/unit.rb', line 551 def pass msg = nil assert true end |
#refute(test, msg = nil) ⇒ Object
Fails if test
is a true value
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# File 'lib/minitest/unit.rb', line 558 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/unit.rb', line 566 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) ⇒ Object
Fails if exp == act
.
For floats use refute_in_delta.
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# File 'lib/minitest/unit.rb', line 577 def refute_equal exp, act, msg = nil msg = (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/unit.rb', line 589 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) ⇒ Object
For comparing Floats. Fails if exp
and act
have a relative error less than epsilon
.
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# File 'lib/minitest/unit.rb', line 601 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/unit.rb', line 608 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) ⇒ Object
Fails if obj
is an instance of cls
.
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# File 'lib/minitest/unit.rb', line 619 def refute_instance_of cls, obj, msg = nil msg = (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/unit.rb', line 629 def refute_kind_of cls, obj, msg = nil # TODO: merge with instance_of msg = (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/unit.rb', line 637 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) ⇒ Object
Fails if obj
is nil.
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# File 'lib/minitest/unit.rb', line 647 def refute_nil obj, msg = nil msg = (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/unit.rb', line 658 def refute_operator o1, op, o2 = UNDEFINED, msg = nil return refute_predicate o1, op, msg if UNDEFINED == o2 msg = (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/unit.rb', line 673 def refute_predicate o1, op, msg = nil msg = (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/unit.rb', line 681 def refute_respond_to obj, meth, msg = nil msg = (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/unit.rb', line 690 def refute_same exp, act, msg = nil msg = (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 |