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
|
require 'test/unit'
class TestRefinement < Test::Unit::TestCase
class Foo
def x
return "Foo#x"
end
def y
return "Foo#y"
end
def call_x
return x
end
end
module FooExt
refine Foo do
def x
return "FooExt#x"
end
def y
return "FooExt#y " + super
end
def z
return "FooExt#z"
end
end
end
module FooExt2
refine Foo do
def x
return "FooExt2#x"
end
def y
return "FooExt2#y " + super
end
def z
return "FooExt2#z"
end
end
end
class FooSub < Foo
def x
return "FooSub#x"
end
def y
return "FooSub#y " + super
end
end
class FooExtClient
using FooExt
def self.invoke_x_on(foo)
return foo.x
end
def self.invoke_y_on(foo)
return foo.y
end
def self.invoke_z_on(foo)
return foo.z
end
def self.invoke_call_x_on(foo)
return foo.call_x
end
end
class FooExtClient2
using FooExt
using FooExt2
def self.invoke_y_on(foo)
return foo.y
end
end
def test_override
foo = Foo.new
assert_equal("Foo#x", foo.x)
assert_equal("FooExt#x", FooExtClient.invoke_x_on(foo))
assert_equal("Foo#x", foo.x)
end
def test_super
foo = Foo.new
assert_equal("Foo#y", foo.y)
assert_equal("FooExt#y Foo#y", FooExtClient.invoke_y_on(foo))
assert_equal("Foo#y", foo.y)
end
def test_super_chain
foo = Foo.new
assert_equal("Foo#y", foo.y)
assert_equal("FooExt2#y FooExt#y Foo#y", FooExtClient2.invoke_y_on(foo))
assert_equal("Foo#y", foo.y)
end
def test_new_method
foo = Foo.new
assert_raise(NoMethodError) { foo.z }
assert_equal("FooExt#z", FooExtClient.invoke_z_on(foo))
assert_raise(NoMethodError) { foo.z }
end
def test_no_local_rebinding
foo = Foo.new
assert_equal("Foo#x", foo.call_x)
assert_equal("Foo#x", FooExtClient.invoke_call_x_on(foo))
assert_equal("Foo#x", foo.call_x)
end
def test_subclass_is_prior
sub = FooSub.new
assert_equal("FooSub#x", sub.x)
assert_equal("FooSub#x", FooExtClient.invoke_x_on(sub))
assert_equal("FooSub#x", sub.x)
end
def test_super_in_subclass
sub = FooSub.new
assert_equal("FooSub#y Foo#y", sub.y)
# not "FooSub#y FooExt#y Foo#y"
assert_equal("FooSub#y Foo#y", FooExtClient.invoke_y_on(sub))
assert_equal("FooSub#y Foo#y", sub.y)
end
def test_new_method_on_subclass
sub = FooSub.new
assert_raise(NoMethodError) { sub.z }
assert_equal("FooExt#z", FooExtClient.invoke_z_on(sub))
assert_raise(NoMethodError) { sub.z }
end
def test_module_eval
foo = Foo.new
assert_equal("Foo#x", foo.x)
assert_equal("FooExt#x", FooExt.module_eval { foo.x })
assert_equal("Foo#x", foo.x)
end
def test_instance_eval
foo = Foo.new
ext_client = FooExtClient.new
assert_equal("Foo#x", foo.x)
assert_equal("FooExt#x", ext_client.instance_eval { foo.x })
assert_equal("Foo#x", foo.x)
end
def test_override_builtin_method
m = Module.new {
refine Fixnum do
def /(other) quo(other) end
end
}
assert_equal(0, 1 / 2)
assert_equal(Rational(1, 2), m.module_eval { 1 / 2 })
assert_equal(0, 1 / 2)
end
def test_return_value_of_refine
mod = nil
result = nil
m = Module.new {
result = refine(Object) {
mod = self
}
}
assert_equal mod, result
end
def test_refine_same_class_twice
result1 = nil
result2 = nil
result3 = nil
m = Module.new {
result1 = refine(Fixnum) {
def foo; return "foo" end
}
result2 = refine(Fixnum) {
def bar; return "bar" end
}
result3 = refine(String) {
def baz; return "baz" end
}
}
assert_equal("foo", m.module_eval { 1.foo })
assert_equal("bar", m.module_eval { 1.bar })
assert_equal(result1, result2)
assert_not_equal(result1, result3)
end
def test_respond_to?
m = Module.new {
refine Fixnum do
def foo; "foo"; end
end
}
assert_equal(false, 1.respond_to?(:foo))
assert_equal(true, m.module_eval { 1.respond_to?(:foo) })
assert_equal(false, 1.respond_to?(:foo))
end
def test_builtin_method_no_local_rebinding
m = Module.new {
refine String do
def <=>(other) return 0 end
end
}
assert_equal(false, m.module_eval { "1" >= "2" })
m2 = Module.new {
refine Array do
def each
super do |i|
yield 2 * i
end
end
end
}
a = [1, 2, 3]
assert_equal(1, m2.module_eval { a.min })
end
def test_module_inclusion
m1 = Module.new {
def foo
"m1#foo"
end
def bar
"m1#bar"
end
}
m2 = Module.new {
def bar
"m2#bar"
end
def baz
"m2#baz"
end
}
m3 = Module.new {
def baz
"m3#baz"
end
}
include_proc = Proc.new {
include m3, m2
}
m = Module.new {
refine String do
include m1
module_eval(&include_proc)
def call_foo
foo
end
def call_bar
bar
end
def call_baz
baz
end
end
def self.call_foo(s)
s.foo
end
def self.call_bar(s)
s.bar
end
def self.call_baz(s)
s.baz
end
}
assert_equal("m1#foo", m.module_eval { "abc".foo })
assert_equal("m2#bar", m.module_eval { "abc".bar })
assert_equal("m3#baz", m.module_eval { "abc".baz })
assert_equal("m1#foo", m.module_eval { "abc".call_foo })
assert_equal("m2#bar", m.module_eval { "abc".call_bar })
assert_equal("m3#baz", m.module_eval { "abc".call_baz })
assert_equal("m1#foo", m.call_foo("abc"))
assert_equal("m2#bar", m.call_bar("abc"))
assert_equal("m3#baz", m.call_baz("abc"))
end
def test_refine_prepended_class
m1 = Module.new {
def foo
super << :m1
end
}
c = Class.new {
prepend m1
def foo
[:c]
end
}
m2 = Module.new {
refine c do
def foo
super << :m2
end
end
}
obj = c.new
assert_equal([:c, :m1, :m2], m2.module_eval { obj.foo })
end
def test_refine_module_without_overriding
m1 = Module.new
c = Class.new {
include m1
}
m2 = Module.new {
refine m1 do
def foo
:m2
end
end
}
obj = c.new
assert_equal(:m2, m2.module_eval { obj.foo })
end
def test_refine_module_with_overriding
m1 = Module.new {
def foo
[:m1]
end
}
c = Class.new {
include m1
}
m2 = Module.new {
refine m1 do
def foo
super << :m2
end
end
}
obj = c.new
assert_equal([:m1, :m2], m2.module_eval { obj.foo })
end
def test_refine_module_and_call_superclass_method
m1 = Module.new
c1 = Class.new {
def foo
"c1#foo"
end
}
c2 = Class.new(c1) {
include m1
}
m2 = Module.new {
refine m1 do
end
}
obj = c2.new
assert_equal("c1#foo", m2.module_eval { obj.foo })
end
def test_refine_neither_class_nor_module
assert_raise(TypeError) do
Module.new {
refine Object.new do
end
}
end
assert_raise(TypeError) do
Module.new {
refine 123 do
end
}
end
assert_raise(TypeError) do
Module.new {
refine "foo" do
end
}
end
end
end
|
