summaryrefslogtreecommitdiffstats
path: root/lib/kunit/string-stream-test.c
blob: 06822766f29afdc8bcb7d9022fe215e2d6fe83fa (plain)
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
// SPDX-License-Identifier: GPL-2.0
/*
 * KUnit test for struct string_stream.
 *
 * Copyright (C) 2019, Google LLC.
 * Author: Brendan Higgins <brendanhiggins@google.com>
 */

#include <kunit/static_stub.h>
#include <kunit/test.h>
#include <linux/ktime.h>
#include <linux/slab.h>
#include <linux/timekeeping.h>

#include "string-stream.h"

struct string_stream_test_priv {
	/* For testing resource-managed free. */
	struct string_stream *expected_free_stream;
	bool stream_was_freed;
	bool stream_free_again;
};

/* Avoids a cast warning if kfree() is passed direct to kunit_add_action(). */
static void kfree_wrapper(void *p)
{
	kfree(p);
}

/* Avoids a cast warning if string_stream_destroy() is passed direct to kunit_add_action(). */
static void cleanup_raw_stream(void *p)
{
	struct string_stream *stream = p;

	string_stream_destroy(stream);
}

static char *get_concatenated_string(struct kunit *test, struct string_stream *stream)
{
	char *str = string_stream_get_string(stream);

	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, str);
	kunit_add_action(test, kfree_wrapper, (void *)str);

	return str;
}

/* Managed string_stream object is initialized correctly. */
static void string_stream_managed_init_test(struct kunit *test)
{
	struct string_stream *stream;

	/* Resource-managed initialization. */
	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	KUNIT_EXPECT_EQ(test, stream->length, 0);
	KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
	KUNIT_EXPECT_TRUE(test, (stream->gfp == GFP_KERNEL));
	KUNIT_EXPECT_FALSE(test, stream->append_newlines);
	KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
}

/* Unmanaged string_stream object is initialized correctly. */
static void string_stream_unmanaged_init_test(struct kunit *test)
{
	struct string_stream *stream;

	stream = alloc_string_stream(GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
	kunit_add_action(test, cleanup_raw_stream, stream);

	KUNIT_EXPECT_EQ(test, stream->length, 0);
	KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
	KUNIT_EXPECT_EQ(test, stream->gfp, GFP_KERNEL);
	KUNIT_EXPECT_FALSE(test, stream->append_newlines);

	KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
}

static void string_stream_destroy_stub(struct string_stream *stream)
{
	struct kunit *fake_test = kunit_get_current_test();
	struct string_stream_test_priv *priv = fake_test->priv;

	/* The kunit could own string_streams other than the one we are testing. */
	if (stream == priv->expected_free_stream) {
		if (priv->stream_was_freed)
			priv->stream_free_again = true;
		else
			priv->stream_was_freed = true;
	}

	/*
	 * Calling string_stream_destroy() will only call this function again
	 * because the redirection stub is still active.
	 * Avoid calling deactivate_static_stub() or changing current->kunit_test
	 * during cleanup.
	 */
	string_stream_clear(stream);
	kfree(stream);
}

/* kunit_free_string_stream() calls string_stream_desrtoy() */
static void string_stream_managed_free_test(struct kunit *test)
{
	struct string_stream_test_priv *priv = test->priv;

	priv->expected_free_stream = NULL;
	priv->stream_was_freed = false;
	priv->stream_free_again = false;

	kunit_activate_static_stub(test,
				   string_stream_destroy,
				   string_stream_destroy_stub);

	priv->expected_free_stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);

	/* This should call the stub function. */
	kunit_free_string_stream(test, priv->expected_free_stream);

	KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
	KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
}

/* string_stream object is freed when test is cleaned up. */
static void string_stream_resource_free_test(struct kunit *test)
{
	struct string_stream_test_priv *priv = test->priv;
	struct kunit *fake_test;

	fake_test = kunit_kzalloc(test, sizeof(*fake_test), GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fake_test);

	kunit_init_test(fake_test, "string_stream_fake_test", NULL);
	fake_test->priv = priv;

	/*
	 * Activate stub before creating string_stream so the
	 * string_stream will be cleaned up first.
	 */
	priv->expected_free_stream = NULL;
	priv->stream_was_freed = false;
	priv->stream_free_again = false;

	kunit_activate_static_stub(fake_test,
				   string_stream_destroy,
				   string_stream_destroy_stub);

	priv->expected_free_stream = kunit_alloc_string_stream(fake_test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);

	/* Set current->kunit_test to fake_test so the static stub will be called. */
	current->kunit_test = fake_test;

	/* Cleanup test - the stub function should be called */
	kunit_cleanup(fake_test);

	/* Set current->kunit_test back to current test. */
	current->kunit_test = test;

	KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
	KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
}

/*
 * Add a series of lines to a string_stream. Check that all lines
 * appear in the correct order and no characters are dropped.
 */
static void string_stream_line_add_test(struct kunit *test)
{
	struct string_stream *stream;
	char line[60];
	char *concat_string, *pos, *string_end;
	size_t len, total_len;
	int num_lines, i;

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	/* Add series of sequence numbered lines */
	total_len = 0;
	for (i = 0; i < 100; ++i) {
		len = snprintf(line, sizeof(line),
			"The quick brown fox jumps over the lazy penguin %d\n", i);

		/* Sanity-check that our test string isn't truncated */
		KUNIT_ASSERT_LT(test, len, sizeof(line));

		string_stream_add(stream, line);
		total_len += len;
	}
	num_lines = i;

	concat_string = get_concatenated_string(test, stream);
	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, concat_string);
	KUNIT_EXPECT_EQ(test, strlen(concat_string), total_len);

	/*
	 * Split the concatenated string at the newlines and check that
	 * all the original added strings are present.
	 */
	pos = concat_string;
	for (i = 0; i < num_lines; ++i) {
		string_end = strchr(pos, '\n');
		KUNIT_EXPECT_NOT_NULL(test, string_end);

		/* Convert to NULL-terminated string */
		*string_end = '\0';

		snprintf(line, sizeof(line),
			 "The quick brown fox jumps over the lazy penguin %d", i);
		KUNIT_EXPECT_STREQ(test, pos, line);

		pos = string_end + 1;
	}

	/* There shouldn't be any more data after this */
	KUNIT_EXPECT_EQ(test, strlen(pos), 0);
}

/* Add a series of lines of variable length to a string_stream. */
static void string_stream_variable_length_line_test(struct kunit *test)
{
	static const char line[] =
		"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
		" 0123456789!$%^&*()_-+={}[]:;@'~#<>,.?/|";
	struct string_stream *stream;
	struct rnd_state rnd;
	char *concat_string, *pos, *string_end;
	size_t offset, total_len;
	int num_lines, i;

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	/*
	 * Log many lines of varying lengths until we have created
	 * many fragments.
	 * The "randomness" must be repeatable.
	 */
	prandom_seed_state(&rnd, 3141592653589793238ULL);
	total_len = 0;
	for (i = 0; i < 100; ++i) {
		offset = prandom_u32_state(&rnd) % (sizeof(line) - 1);
		string_stream_add(stream, "%s\n", &line[offset]);
		total_len += sizeof(line) - offset;
	}
	num_lines = i;

	concat_string = get_concatenated_string(test, stream);
	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, concat_string);
	KUNIT_EXPECT_EQ(test, strlen(concat_string), total_len);

	/*
	 * Split the concatenated string at the newlines and check that
	 * all the original added strings are present.
	 */
	prandom_seed_state(&rnd, 3141592653589793238ULL);
	pos = concat_string;
	for (i = 0; i < num_lines; ++i) {
		string_end = strchr(pos, '\n');
		KUNIT_EXPECT_NOT_NULL(test, string_end);

		/* Convert to NULL-terminated string */
		*string_end = '\0';

		offset = prandom_u32_state(&rnd) % (sizeof(line) - 1);
		KUNIT_EXPECT_STREQ(test, pos, &line[offset]);

		pos = string_end + 1;
	}

	/* There shouldn't be any more data after this */
	KUNIT_EXPECT_EQ(test, strlen(pos), 0);
}

/* Appending the content of one string stream to another. */
static void string_stream_append_test(struct kunit *test)
{
	static const char * const strings_1[] = {
		"one", "two", "three", "four", "five", "six",
		"seven", "eight", "nine", "ten",
	};
	static const char * const strings_2[] = {
		"Apple", "Pear", "Orange", "Banana", "Grape", "Apricot",
	};
	struct string_stream *stream_1, *stream_2;
	const char *stream1_content_before_append, *stream_2_content;
	char *combined_content;
	size_t combined_length;
	int i;

	stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);

	stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);

	/* Append content of empty stream to empty stream */
	string_stream_append(stream_1, stream_2);
	KUNIT_EXPECT_EQ(test, strlen(get_concatenated_string(test, stream_1)), 0);

	/* Add some data to stream_1 */
	for (i = 0; i < ARRAY_SIZE(strings_1); ++i)
		string_stream_add(stream_1, "%s\n", strings_1[i]);

	stream1_content_before_append = get_concatenated_string(test, stream_1);

	/* Append content of empty stream to non-empty stream */
	string_stream_append(stream_1, stream_2);
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
			   stream1_content_before_append);

	/* Add some data to stream_2 */
	for (i = 0; i < ARRAY_SIZE(strings_2); ++i)
		string_stream_add(stream_2, "%s\n", strings_2[i]);

	/* Append content of non-empty stream to non-empty stream */
	string_stream_append(stream_1, stream_2);

	/*
	 * End result should be the original content of stream_1 plus
	 * the content of stream_2.
	 */
	stream_2_content = get_concatenated_string(test, stream_2);
	combined_length = strlen(stream1_content_before_append) + strlen(stream_2_content);
	combined_length++; /* for terminating \0 */
	combined_content = kunit_kmalloc(test, combined_length, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, combined_content);
	snprintf(combined_content, combined_length, "%s%s",
		 stream1_content_before_append, stream_2_content);

	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1), combined_content);

	/* Append content of non-empty stream to empty stream */
	kunit_free_string_stream(test, stream_1);

	stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);

	string_stream_append(stream_1, stream_2);
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1), stream_2_content);
}

/* Appending the content of one string stream to one with auto-newlining. */
static void string_stream_append_auto_newline_test(struct kunit *test)
{
	struct string_stream *stream_1, *stream_2;

	/* Stream 1 has newline appending enabled */
	stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
	string_stream_set_append_newlines(stream_1, true);
	KUNIT_EXPECT_TRUE(test, stream_1->append_newlines);

	/* Stream 2 does not append newlines */
	stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);

	/* Appending a stream with a newline should not add another newline */
	string_stream_add(stream_1, "Original string\n");
	string_stream_add(stream_2, "Appended content\n");
	string_stream_add(stream_2, "More stuff\n");
	string_stream_append(stream_1, stream_2);
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
			   "Original string\nAppended content\nMore stuff\n");

	kunit_free_string_stream(test, stream_2);
	stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);

	/*
	 * Appending a stream without newline should add a final newline.
	 * The appended string_stream is treated as a single string so newlines
	 * should not be inserted between fragments.
	 */
	string_stream_add(stream_2, "Another");
	string_stream_add(stream_2, "And again");
	string_stream_append(stream_1, stream_2);
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
			   "Original string\nAppended content\nMore stuff\nAnotherAnd again\n");
}

/* Adding an empty string should not create a fragment. */
static void string_stream_append_empty_string_test(struct kunit *test)
{
	struct string_stream *stream;
	int original_frag_count;

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	/* Formatted empty string */
	string_stream_add(stream, "%s", "");
	KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
	KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));

	/* Adding an empty string to a non-empty stream */
	string_stream_add(stream, "Add this line");
	original_frag_count = list_count_nodes(&stream->fragments);

	string_stream_add(stream, "%s", "");
	KUNIT_EXPECT_EQ(test, list_count_nodes(&stream->fragments), original_frag_count);
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream), "Add this line");
}

/* Adding strings without automatic newline appending */
static void string_stream_no_auto_newline_test(struct kunit *test)
{
	struct string_stream *stream;

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	/*
	 * Add some strings with and without newlines. All formatted newlines
	 * should be preserved. It should not add any extra newlines.
	 */
	string_stream_add(stream, "One");
	string_stream_add(stream, "Two\n");
	string_stream_add(stream, "%s\n", "Three");
	string_stream_add(stream, "%s", "Four\n");
	string_stream_add(stream, "Five\n%s", "Six");
	string_stream_add(stream, "Seven\n\n");
	string_stream_add(stream, "Eight");
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream),
			   "OneTwo\nThree\nFour\nFive\nSixSeven\n\nEight");
}

/* Adding strings with automatic newline appending */
static void string_stream_auto_newline_test(struct kunit *test)
{
	struct string_stream *stream;

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	string_stream_set_append_newlines(stream, true);
	KUNIT_EXPECT_TRUE(test, stream->append_newlines);

	/*
	 * Add some strings with and without newlines. Newlines should
	 * be appended to lines that do not end with \n, but newlines
	 * resulting from the formatting should not be changed.
	 */
	string_stream_add(stream, "One");
	string_stream_add(stream, "Two\n");
	string_stream_add(stream, "%s\n", "Three");
	string_stream_add(stream, "%s", "Four\n");
	string_stream_add(stream, "Five\n%s", "Six");
	string_stream_add(stream, "Seven\n\n");
	string_stream_add(stream, "Eight");
	KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream),
			   "One\nTwo\nThree\nFour\nFive\nSix\nSeven\n\nEight\n");
}

/*
 * This doesn't actually "test" anything. It reports time taken
 * and memory used for logging a large number of lines.
 */
static void string_stream_performance_test(struct kunit *test)
{
	struct string_stream_fragment *frag_container;
	struct string_stream *stream;
	char test_line[101];
	ktime_t start_time, end_time;
	size_t len, bytes_requested, actual_bytes_used, total_string_length;
	int offset, i;

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);

	memset(test_line, 'x', sizeof(test_line) - 1);
	test_line[sizeof(test_line) - 1] = '\0';

	start_time = ktime_get();
	for (i = 0; i < 10000; i++) {
		offset = i % (sizeof(test_line) - 1);
		string_stream_add(stream, "%s: %d\n", &test_line[offset], i);
	}
	end_time = ktime_get();

	/*
	 * Calculate memory used. This doesn't include invisible
	 * overhead due to kernel allocator fragment size rounding.
	 */
	bytes_requested = sizeof(*stream);
	actual_bytes_used = ksize(stream);
	total_string_length = 0;

	list_for_each_entry(frag_container, &stream->fragments, node) {
		bytes_requested += sizeof(*frag_container);
		actual_bytes_used += ksize(frag_container);

		len = strlen(frag_container->fragment);
		total_string_length += len;
		bytes_requested += len + 1; /* +1 for '\0' */
		actual_bytes_used += ksize(frag_container->fragment);
	}

	kunit_info(test, "Time elapsed:           %lld us\n",
		   ktime_us_delta(end_time, start_time));
	kunit_info(test, "Total string length:    %zu\n", total_string_length);
	kunit_info(test, "Bytes requested:        %zu\n", bytes_requested);
	kunit_info(test, "Actual bytes allocated: %zu\n", actual_bytes_used);
}

static int string_stream_test_init(struct kunit *test)
{
	struct string_stream_test_priv *priv;

	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	test->priv = priv;

	return 0;
}

static struct kunit_case string_stream_test_cases[] = {
	KUNIT_CASE(string_stream_managed_init_test),
	KUNIT_CASE(string_stream_unmanaged_init_test),
	KUNIT_CASE(string_stream_managed_free_test),
	KUNIT_CASE(string_stream_resource_free_test),
	KUNIT_CASE(string_stream_line_add_test),
	KUNIT_CASE(string_stream_variable_length_line_test),
	KUNIT_CASE(string_stream_append_test),
	KUNIT_CASE(string_stream_append_auto_newline_test),
	KUNIT_CASE(string_stream_append_empty_string_test),
	KUNIT_CASE(string_stream_no_auto_newline_test),
	KUNIT_CASE(string_stream_auto_newline_test),
	KUNIT_CASE(string_stream_performance_test),
	{}
};

static struct kunit_suite string_stream_test_suite = {
	.name = "string-stream-test",
	.test_cases = string_stream_test_cases,
	.init = string_stream_test_init,
};
kunit_test_suites(&string_stream_test_suite);