-
Notifications
You must be signed in to change notification settings - Fork 555
/
assertions.rb
802 lines (653 loc) · 21.6 KB
/
assertions.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
# encoding: UTF-8
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/ &&
system("diff.exe", __FILE__, __FILE__)) then
"diff.exe -u"
elsif system("gdiff", __FILE__, __FILE__)
"gdiff -u" # solaris and kin suck
elsif system("diff", __FILE__, __FILE__)
"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
if defined? Encoding then
s = s.encode Encoding.default_external
if String === obj && (obj.encoding != Encoding.default_external ||
!obj.valid_encoding?) then
enc = "# encoding: #{obj.encoding}"
val = "# valid: #{obj.valid_encoding?}"
s = "#{enc}\n#{val}\n#{s}"
end
end
s
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
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
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
##
# 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
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 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+.
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
##
# 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
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 = 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
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 }
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
captured_stdout.unlink
captured_stderr.unlink
$stdout.reopen orig_stdout
$stderr.reopen orig_stderr
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")}",
"---------------",
].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" }
not 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
##
# 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+.
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
##
# 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, bt = caller
msg ||= "Skipped, no message given"
@skip = true
raise Minitest::Skip, msg, bt
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.first.split(/:/, 3).first(2).join ":"
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