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1 | |
2 | // Copyright Oliver Kowalke 2014. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #include <algorithm> | |
8 | #include <cstdio> | |
9 | #include <iostream> | |
10 | #include <sstream> | |
11 | #include <stdexcept> | |
12 | #include <string> | |
13 | #include <tuple> | |
14 | #include <vector> | |
15 | ||
16 | #include <boost/assert.hpp> | |
17 | #include <boost/test/unit_test.hpp> | |
18 | ||
19 | #include <boost/coroutine2/coroutine.hpp> | |
20 | ||
21 | namespace coro = boost::coroutines2; | |
22 | ||
23 | int value1 = 0; | |
24 | std::string value2 = ""; | |
25 | bool value3 = false; | |
26 | double value4 = .0; | |
27 | int * value5 = 0; | |
28 | int& value6 = value1; | |
29 | int& value7 = value1; | |
30 | int value8 = 0; | |
31 | int value9 = 0; | |
32 | ||
33 | struct X | |
34 | { | |
35 | X() { value1 = 7; } | |
36 | ~X() { value1 = 0; } | |
37 | ||
38 | X( X const&) = delete; | |
39 | X & operator=( X const&) = delete; | |
40 | }; | |
41 | ||
42 | class copyable | |
43 | { | |
44 | public: | |
45 | bool state; | |
46 | ||
47 | copyable() : | |
48 | state( false) | |
49 | {} | |
50 | ||
51 | copyable( int) : | |
52 | state( true) | |
53 | {} | |
54 | ||
55 | void operator()( coro::coroutine< int >::push_type &) | |
56 | { value3 = state; } | |
57 | }; | |
58 | ||
59 | class moveable | |
60 | { | |
61 | public: | |
62 | bool state; | |
63 | ||
64 | moveable() : | |
65 | state( false) | |
66 | {} | |
67 | ||
68 | moveable( int) : | |
69 | state( true) | |
70 | {} | |
71 | ||
72 | moveable( moveable const&) = delete; | |
73 | moveable & operator=( moveable const&) = delete; | |
74 | ||
75 | moveable( moveable && other) : | |
76 | state( false) | |
77 | { std::swap( state, other.state); } | |
78 | ||
79 | moveable & operator=( moveable && other) | |
80 | { | |
81 | if ( this != & other) { | |
82 | state = other.state; | |
83 | other.state = false; | |
84 | } | |
85 | return * this; | |
86 | } | |
87 | ||
88 | void operator()( coro::coroutine< int >::push_type &) | |
89 | { value3 = state; } | |
90 | }; | |
91 | ||
92 | class movedata | |
93 | { | |
94 | public: | |
95 | int i; | |
96 | ||
97 | movedata( int i_) : | |
98 | i( i_) | |
99 | {} | |
100 | ||
101 | movedata( movedata const&) = delete; | |
102 | movedata & operator=( movedata const&) = delete; | |
103 | ||
104 | movedata( movedata && other) : | |
105 | i( 0) | |
106 | { std::swap( i, other.i); } | |
107 | ||
108 | movedata & operator=( movedata && other) | |
109 | { | |
110 | if ( this != & other) { | |
111 | i = other.i; | |
112 | other.i = 0; | |
113 | } | |
114 | return * this; | |
115 | } | |
116 | }; | |
117 | ||
118 | struct my_exception {}; | |
119 | ||
120 | void f1( coro::coroutine< void >::push_type & c) | |
121 | { | |
122 | while ( c) | |
123 | c(); | |
124 | } | |
125 | ||
126 | void f2( coro::coroutine< void >::push_type &) | |
127 | { ++value1; } | |
128 | ||
129 | void f3( coro::coroutine< void >::push_type & c) | |
130 | { | |
131 | ++value1; | |
132 | c(); | |
133 | ++value1; | |
134 | } | |
135 | ||
136 | void f4( coro::coroutine< int >::push_type & c) | |
137 | { | |
138 | c( 3); | |
139 | c( 7); | |
140 | } | |
141 | ||
142 | void f5( coro::coroutine< std::string >::push_type & c) | |
143 | { | |
144 | std::string res("abc"); | |
145 | c( res); | |
146 | res = "xyz"; | |
147 | c( res); | |
148 | } | |
149 | ||
150 | void f6( coro::coroutine< int >::pull_type & c) | |
151 | { value1 = c.get(); } | |
152 | ||
153 | void f7( coro::coroutine< std::string >::pull_type & c) | |
154 | { value2 = c.get(); } | |
155 | ||
156 | void f8( coro::coroutine< std::tuple< double, double > >::pull_type & c) | |
157 | { | |
158 | double x = 0, y = 0; | |
159 | std::tie( x, y) = c.get(); | |
160 | value4 = x + y; | |
161 | c(); | |
162 | std::tie( x, y) = c.get(); | |
163 | value4 = x + y; | |
164 | } | |
165 | ||
166 | void f9( coro::coroutine< int * >::pull_type & c) | |
167 | { value5 = c.get(); } | |
168 | ||
169 | void f91( coro::coroutine< int const* >::pull_type & c) | |
170 | { value5 = const_cast< int * >( c.get() ); } | |
171 | ||
172 | void f10( coro::coroutine< int & >::pull_type & c) | |
173 | { | |
174 | int const& i = c.get(); | |
175 | value5 = const_cast< int * >( & i); | |
176 | } | |
177 | ||
178 | void f101( coro::coroutine< int const& >::pull_type & c) | |
179 | { | |
180 | int const& i = c.get(); | |
181 | value5 = const_cast< int * >( & i); | |
182 | } | |
183 | ||
184 | void f11( coro::coroutine< std::tuple< int, int > >::pull_type & c) | |
185 | { | |
186 | std::tie( value8, value9) = c.get(); | |
187 | } | |
188 | ||
189 | void f12( coro::coroutine< void >::pull_type & c) | |
190 | { | |
191 | value1 = 7; | |
192 | X x_; | |
193 | c(); | |
194 | c(); | |
195 | } | |
196 | ||
197 | void f16( coro::coroutine< int >::push_type & c) | |
198 | { | |
199 | c( 1); | |
200 | c( 2); | |
201 | c( 3); | |
202 | c( 4); | |
203 | c( 5); | |
204 | } | |
205 | ||
206 | void f17( coro::coroutine< int >::pull_type & c, std::vector< int > & vec) | |
207 | { | |
208 | int x = c.get(); | |
209 | while ( 5 > x) | |
210 | { | |
211 | vec.push_back( x); | |
212 | x = c().get(); | |
213 | } | |
214 | } | |
215 | ||
216 | void f20( coro::coroutine< int >::push_type &) | |
217 | {} | |
218 | ||
219 | void f21( coro::coroutine< int >::pull_type & c) | |
220 | { | |
221 | while ( c) | |
222 | { | |
223 | value1 = c.get(); | |
224 | c(); | |
225 | } | |
226 | } | |
227 | ||
228 | void f22( coro::coroutine< movedata >::pull_type & c) | |
229 | { | |
230 | movedata mv( c.get() ); | |
231 | value1 = mv.i; | |
232 | } | |
233 | ||
234 | void test_move() | |
235 | { | |
236 | { | |
237 | coro::coroutine< int >::pull_type coro1( f20); | |
238 | coro::coroutine< int >::pull_type coro2( f16); | |
239 | BOOST_CHECK( ! coro1); | |
240 | BOOST_CHECK( coro2); | |
241 | BOOST_CHECK_EQUAL( 1, coro2.get() ); | |
242 | coro2(); | |
243 | BOOST_CHECK_EQUAL( 2, coro2.get() ); | |
244 | coro1 = std::move( coro2); | |
245 | BOOST_CHECK( coro1); | |
246 | BOOST_CHECK( ! coro2); | |
247 | coro1(); | |
248 | BOOST_CHECK_EQUAL( 3, coro1.get() ); | |
249 | BOOST_CHECK( ! coro2); | |
250 | } | |
251 | ||
252 | { | |
253 | value3 = false; | |
254 | copyable cp( 3); | |
255 | BOOST_CHECK( cp.state); | |
256 | BOOST_CHECK( ! value3); | |
257 | coro::coroutine< int >::pull_type coro( cp); | |
258 | BOOST_CHECK( cp.state); | |
259 | BOOST_CHECK( value3); | |
260 | } | |
261 | ||
262 | { | |
263 | value3 = false; | |
264 | moveable mv( 7); | |
265 | BOOST_CHECK( mv.state); | |
266 | BOOST_CHECK( ! value3); | |
267 | coro::coroutine< int >::pull_type coro( std::move( mv) ); | |
268 | BOOST_CHECK( ! mv.state); | |
269 | BOOST_CHECK( value3); | |
270 | } | |
271 | ||
272 | { | |
273 | value1 = 0; | |
274 | movedata mv( 7); | |
275 | BOOST_CHECK_EQUAL( 0, value1); | |
276 | BOOST_CHECK_EQUAL( 7, mv.i); | |
277 | coro::coroutine< movedata >::push_type coro( f22); | |
278 | coro( std::move( mv) ); | |
279 | BOOST_CHECK_EQUAL( 7, value1); | |
280 | BOOST_CHECK_EQUAL( 0, mv.i); | |
281 | } | |
282 | } | |
283 | ||
284 | void test_complete() | |
285 | { | |
286 | value1 = 0; | |
287 | ||
288 | coro::coroutine< void >::pull_type coro( f2); | |
289 | BOOST_CHECK( ! coro); | |
290 | BOOST_CHECK_EQUAL( ( int)1, value1); | |
291 | } | |
292 | ||
293 | void test_jump() | |
294 | { | |
295 | value1 = 0; | |
296 | ||
297 | coro::coroutine< void >::pull_type coro( f3); | |
298 | BOOST_CHECK( coro); | |
299 | BOOST_CHECK_EQUAL( ( int)1, value1); | |
300 | coro(); | |
301 | BOOST_CHECK( ! coro); | |
302 | BOOST_CHECK_EQUAL( ( int)2, value1); | |
303 | } | |
304 | ||
305 | void test_result_int() | |
306 | { | |
307 | coro::coroutine< int >::pull_type coro( f4); | |
308 | BOOST_CHECK( coro); | |
309 | int result = coro.get(); | |
310 | BOOST_CHECK( coro); | |
311 | BOOST_CHECK_EQUAL( 3, result); | |
312 | result = coro().get(); | |
313 | BOOST_CHECK( coro); | |
314 | BOOST_CHECK_EQUAL( 7, result); | |
315 | coro(); | |
316 | BOOST_CHECK( ! coro); | |
317 | } | |
318 | ||
319 | void test_result_string() | |
320 | { | |
321 | coro::coroutine< std::string >::pull_type coro( f5); | |
322 | BOOST_CHECK( coro); | |
323 | std::string result = coro.get(); | |
324 | BOOST_CHECK( coro); | |
325 | BOOST_CHECK_EQUAL( std::string("abc"), result); | |
326 | result = coro().get(); | |
327 | BOOST_CHECK( coro); | |
328 | BOOST_CHECK_EQUAL( std::string("xyz"), result); | |
329 | coro(); | |
330 | BOOST_CHECK( ! coro); | |
331 | } | |
332 | ||
333 | void test_arg_int() | |
334 | { | |
335 | value1 = 0; | |
336 | ||
337 | coro::coroutine< int >::push_type coro( f6); | |
338 | BOOST_CHECK( coro); | |
339 | coro( 3); | |
340 | BOOST_CHECK( ! coro); | |
341 | BOOST_CHECK_EQUAL( 3, value1); | |
342 | } | |
343 | ||
344 | void test_arg_string() | |
345 | { | |
346 | value2 = ""; | |
347 | ||
348 | coro::coroutine< std::string >::push_type coro( f7); | |
349 | BOOST_CHECK( coro); | |
350 | coro( std::string("abc") ); | |
351 | BOOST_CHECK( ! coro); | |
352 | BOOST_CHECK_EQUAL( std::string("abc"), value2); | |
353 | } | |
354 | ||
355 | void test_fp() | |
356 | { | |
357 | value4 = 0; | |
358 | ||
359 | coro::coroutine< std::tuple< double, double > >::push_type coro( f8); | |
360 | BOOST_CHECK( coro); | |
361 | coro( std::make_tuple( 7.35, 3.14) ); | |
362 | BOOST_CHECK( coro); | |
363 | BOOST_CHECK_EQUAL( ( double) 10.49, value4); | |
364 | ||
365 | value4 = 0; | |
366 | coro( std::make_tuple( 1.15, 3.14) ); | |
367 | BOOST_CHECK( ! coro); | |
368 | BOOST_CHECK_EQUAL( ( double) 4.29, value4); | |
369 | } | |
370 | ||
371 | void test_ptr() | |
372 | { | |
373 | value5 = 0; | |
374 | ||
375 | int a = 3; | |
376 | coro::coroutine< int * >::push_type coro( f9); | |
377 | BOOST_CHECK( coro); | |
378 | coro( & a); | |
379 | BOOST_CHECK( ! coro); | |
380 | BOOST_CHECK_EQUAL( & a, value5); | |
381 | } | |
382 | ||
383 | void test_const_ptr() | |
384 | { | |
385 | value5 = 0; | |
386 | ||
387 | int a = 3; | |
388 | coro::coroutine< int const* >::push_type coro( f91); | |
389 | BOOST_CHECK( coro); | |
390 | coro( & a); | |
391 | BOOST_CHECK( ! coro); | |
392 | BOOST_CHECK_EQUAL( & a, value5); | |
393 | } | |
394 | ||
395 | void test_ref() | |
396 | { | |
397 | value5 = 0; | |
398 | ||
399 | int a = 3; | |
400 | coro::coroutine< int & >::push_type coro( f10); | |
401 | BOOST_CHECK( coro); | |
402 | coro( a); | |
403 | BOOST_CHECK( ! coro); | |
404 | BOOST_CHECK_EQUAL( & a, value5); | |
405 | } | |
406 | ||
407 | void test_const_ref() | |
408 | { | |
409 | value5 = 0; | |
410 | ||
411 | int a = 3; | |
412 | coro::coroutine< int const& >::push_type coro( f101); | |
413 | BOOST_CHECK( coro); | |
414 | coro( a); | |
415 | BOOST_CHECK( ! coro); | |
416 | BOOST_CHECK_EQUAL( & a, value5); | |
417 | } | |
418 | ||
419 | void test_no_result() | |
420 | { | |
421 | coro::coroutine< int >::pull_type coro( f20); | |
422 | BOOST_CHECK( ! coro); | |
423 | } | |
424 | ||
425 | void test_tuple() | |
426 | { | |
427 | value8 = 0; | |
428 | value9 = 0; | |
429 | ||
430 | int a = 3, b = 7; | |
431 | std::tuple< int, int > tpl( a, b); | |
432 | BOOST_CHECK_EQUAL( a, std::get< 0 >( tpl) ); | |
433 | BOOST_CHECK_EQUAL( b, std::get< 1 >( tpl) ); | |
434 | coro::coroutine< std::tuple< int, int > >::push_type coro( f11); | |
435 | BOOST_CHECK( coro); | |
436 | coro( tpl); | |
437 | BOOST_CHECK( ! coro); | |
438 | BOOST_CHECK_EQUAL( a, value8); | |
439 | BOOST_CHECK_EQUAL( b, value9); | |
440 | } | |
441 | ||
442 | void test_unwind() | |
443 | { | |
444 | value1 = 0; | |
445 | { | |
446 | coro::coroutine< void >::push_type coro( f12); | |
447 | BOOST_CHECK( coro); | |
448 | BOOST_CHECK_EQUAL( ( int) 0, value1); | |
449 | coro(); | |
450 | BOOST_CHECK( coro); | |
451 | BOOST_CHECK_EQUAL( ( int) 7, value1); | |
452 | coro(); | |
453 | BOOST_CHECK_EQUAL( ( int) 7, value1); | |
454 | } | |
455 | BOOST_CHECK_EQUAL( ( int) 0, value1); | |
456 | int i = 0; | |
457 | { | |
458 | coro::coroutine< void >::push_type coro( | |
459 | [&i](coro::coroutine< void >::pull_type &) mutable { | |
460 | i = 7; | |
461 | }); | |
462 | } | |
463 | BOOST_CHECK_EQUAL( ( int) 0, i); | |
464 | } | |
465 | ||
466 | void test_exceptions() | |
467 | { | |
468 | std::string msg("abc"), value; | |
469 | std::runtime_error ex( msg); | |
470 | try | |
471 | { | |
472 | coro::coroutine< void >::push_type coro( | |
473 | [&msg]( coro::coroutine< void >::pull_type &) { | |
474 | throw std::runtime_error( msg); | |
475 | }); | |
476 | BOOST_CHECK( coro); | |
477 | coro(); | |
478 | BOOST_CHECK( ! coro); | |
479 | BOOST_CHECK( false); | |
480 | } | |
481 | catch ( std::runtime_error const& ex) | |
482 | { value = ex.what(); } | |
483 | BOOST_CHECK_EQUAL( value, msg); | |
484 | } | |
485 | ||
486 | void test_input_iterator() | |
487 | { | |
488 | { | |
489 | using std::begin; | |
490 | using std::end; | |
491 | ||
492 | std::vector< int > vec; | |
493 | coro::coroutine< int >::pull_type coro( f16); | |
494 | coro::coroutine< int >::pull_type::iterator e = end( coro); | |
495 | for ( | |
496 | coro::coroutine< int >::pull_type::iterator i = begin( coro); | |
497 | i != e; ++i) | |
498 | { vec.push_back( * i); } | |
499 | BOOST_CHECK_EQUAL( ( std::size_t)5, vec.size() ); | |
500 | BOOST_CHECK_EQUAL( ( int)1, vec[0] ); | |
501 | BOOST_CHECK_EQUAL( ( int)2, vec[1] ); | |
502 | BOOST_CHECK_EQUAL( ( int)3, vec[2] ); | |
503 | BOOST_CHECK_EQUAL( ( int)4, vec[3] ); | |
504 | BOOST_CHECK_EQUAL( ( int)5, vec[4] ); | |
505 | } | |
506 | { | |
507 | std::vector< int > vec; | |
508 | coro::coroutine< int >::pull_type coro( f16); | |
509 | for ( auto i : coro) | |
510 | { vec.push_back( i); } | |
511 | BOOST_CHECK_EQUAL( ( std::size_t)5, vec.size() ); | |
512 | BOOST_CHECK_EQUAL( ( int)1, vec[0] ); | |
513 | BOOST_CHECK_EQUAL( ( int)2, vec[1] ); | |
514 | BOOST_CHECK_EQUAL( ( int)3, vec[2] ); | |
515 | BOOST_CHECK_EQUAL( ( int)4, vec[3] ); | |
516 | BOOST_CHECK_EQUAL( ( int)5, vec[4] ); | |
517 | } | |
518 | { | |
519 | int i1 = 1, i2 = 2, i3 = 3; | |
520 | coro::coroutine< int& >::pull_type coro( | |
521 | [&i1,&i2,&i3](coro::coroutine< int& >::push_type & c){ | |
522 | c( i1); | |
523 | c( i2); | |
524 | c( i3); | |
525 | }); | |
526 | ||
527 | int counter = 1; | |
528 | for ( int & i : coro) { | |
529 | switch ( counter) { | |
530 | case 1: | |
531 | BOOST_CHECK_EQUAL( & i1, & i); | |
532 | break; | |
533 | case 2: | |
534 | BOOST_CHECK_EQUAL( & i2, & i); | |
535 | break; | |
536 | case 3: | |
537 | BOOST_CHECK_EQUAL( & i3, & i); | |
538 | break; | |
539 | default: | |
540 | BOOST_ASSERT( false); | |
541 | } | |
542 | ++counter; | |
543 | } | |
544 | } | |
545 | } | |
546 | ||
547 | void test_output_iterator() | |
548 | { | |
549 | using std::begin; | |
550 | using std::end; | |
551 | ||
552 | int counter = 0; | |
553 | std::vector< int > vec; | |
554 | coro::coroutine< int >::push_type coro( | |
555 | [&vec]( coro::coroutine< int >::pull_type & c) { | |
556 | int x = c.get(); | |
557 | while ( 5 > x) | |
558 | { | |
559 | vec.push_back( x); | |
560 | x = c().get(); | |
561 | } | |
562 | }); | |
563 | // coro::coroutine< int >::push_type coro( | |
564 | // std::bind( f17, std::placeholders::_1, std::ref( vec) ) ); | |
565 | coro::coroutine< int >::push_type::iterator e( end( coro) ); | |
566 | for ( coro::coroutine< int >::push_type::iterator i( begin( coro) ); | |
567 | i != e; ++i) | |
568 | { | |
569 | i = ++counter; | |
570 | } | |
571 | BOOST_CHECK_EQUAL( ( std::size_t)4, vec.size() ); | |
572 | BOOST_CHECK_EQUAL( ( int)1, vec[0] ); | |
573 | BOOST_CHECK_EQUAL( ( int)2, vec[1] ); | |
574 | BOOST_CHECK_EQUAL( ( int)3, vec[2] ); | |
575 | BOOST_CHECK_EQUAL( ( int)4, vec[3] ); | |
576 | } | |
577 | ||
578 | std::vector< int > vec; | |
579 | coro::coroutine< void >::pull_type * child = nullptr; | |
580 | ||
581 | void start_child_coroutine() { | |
582 | child = new coro::coroutine< void >::pull_type([](coro::coroutine< void >::push_type & yield) { | |
583 | vec.push_back( 2); | |
584 | yield(); | |
585 | vec.push_back( 2); | |
586 | yield(); | |
587 | vec.push_back( 2); | |
588 | yield(); | |
589 | vec.push_back( 2); | |
590 | yield(); | |
591 | vec.push_back( 2); | |
592 | yield(); | |
593 | vec.push_back( 2); | |
594 | }); | |
595 | } | |
596 | ||
597 | coro::coroutine< void >::pull_type start_parent_coroutine() { | |
598 | return coro::coroutine< void >::pull_type([=](coro::coroutine< void >::push_type & yield) { | |
599 | vec.push_back( 1); | |
600 | start_child_coroutine(); | |
601 | yield(); | |
602 | vec.push_back( 1); | |
603 | }); | |
604 | } | |
605 | ||
606 | void test_chaining() | |
607 | { | |
608 | auto parent = start_parent_coroutine(); | |
609 | while ( * child) { | |
610 | ( * child)(); | |
611 | } | |
612 | BOOST_CHECK_EQUAL( 7, vec.size() ); | |
613 | BOOST_CHECK_EQUAL( 1, vec[0]); | |
614 | BOOST_CHECK_EQUAL( 2, vec[1]); | |
615 | BOOST_CHECK_EQUAL( 2, vec[2]); | |
616 | BOOST_CHECK_EQUAL( 2, vec[3]); | |
617 | BOOST_CHECK_EQUAL( 2, vec[4]); | |
618 | BOOST_CHECK_EQUAL( 2, vec[5]); | |
619 | BOOST_CHECK_EQUAL( 2, vec[6]); | |
620 | } | |
621 | ||
622 | boost::unit_test::test_suite * init_unit_test_suite( int, char* []) | |
623 | { | |
624 | boost::unit_test::test_suite * test = | |
625 | BOOST_TEST_SUITE("Boost.Coroutine2: coroutine test suite"); | |
626 | ||
627 | test->add( BOOST_TEST_CASE( & test_move) ); | |
628 | test->add( BOOST_TEST_CASE( & test_complete) ); | |
629 | test->add( BOOST_TEST_CASE( & test_jump) ); | |
630 | test->add( BOOST_TEST_CASE( & test_result_int) ); | |
631 | test->add( BOOST_TEST_CASE( & test_result_string) ); | |
632 | test->add( BOOST_TEST_CASE( & test_arg_int) ); | |
633 | test->add( BOOST_TEST_CASE( & test_arg_string) ); | |
634 | test->add( BOOST_TEST_CASE( & test_fp) ); | |
635 | test->add( BOOST_TEST_CASE( & test_ptr) ); | |
636 | test->add( BOOST_TEST_CASE( & test_const_ptr) ); | |
637 | test->add( BOOST_TEST_CASE( & test_no_result) ); | |
638 | test->add( BOOST_TEST_CASE( & test_ref) ); | |
639 | test->add( BOOST_TEST_CASE( & test_const_ref) ); | |
640 | test->add( BOOST_TEST_CASE( & test_tuple) ); | |
641 | test->add( BOOST_TEST_CASE( & test_unwind) ); | |
642 | test->add( BOOST_TEST_CASE( & test_exceptions) ); | |
643 | test->add( BOOST_TEST_CASE( & test_input_iterator) ); | |
644 | test->add( BOOST_TEST_CASE( & test_output_iterator) ); | |
645 | test->add( BOOST_TEST_CASE( & test_chaining) ); | |
646 | ||
647 | return test; | |
648 | } |