[PATCH v3 0/1] lib: Convert UUID runtime test to KUnit

[PATCH v3 0/1] lib: Convert UUID runtime test to KUnit

[André Almeida]

Hi,

This patch converts existing UUID runtime test to use KUnit framework.

Below, there's a comparison between the old output format and the new
one. Keep in mind that even if KUnit seems very verbose, this is the
corner case where _every_ test has failed.

* This is how the current output looks like in success:

  test_uuid: all 18 tests passed

* And when it fails:

  test_uuid: conversion test #1 failed on LE data: 'c33f4995-3701-450e-9fbf-206a2e98e576'
  test_uuid: cmp test #2 failed on LE data: 'c33f4995-3701-450e-9fbf-206a2e98e576'
  test_uuid: cmp test #2 actual data: 'c33f4995-3701-450e-9fbf-206a2e98e576'
  test_uuid: conversion test #3 failed on BE data: 'c33f4995-3701-450e-9fbf-206a2e98e576'
  test_uuid: cmp test #4 failed on BE data: 'c33f4995-3701-450e-9fbf-206a2e98e576'
  test_uuid: cmp test #4 actual data: 'c33f4995-3701-450e-9fbf-206a2e98e576'
  test_uuid: conversion test #5 failed on LE data: '64b4371c-77c1-48f9-8221-29f054fc023b'
  test_uuid: cmp test #6 failed on LE data: '64b4371c-77c1-48f9-8221-29f054fc023b'
  test_uuid: cmp test #6 actual data: '64b4371c-77c1-48f9-8221-29f054fc023b'
  test_uuid: conversion test #7 failed on BE data: '64b4371c-77c1-48f9-8221-29f054fc023b'
  test_uuid: cmp test #8 failed on BE data: '64b4371c-77c1-48f9-8221-29f054fc023b'
  test_uuid: cmp test #8 actual data: '64b4371c-77c1-48f9-8221-29f054fc023b'
  test_uuid: conversion test #9 failed on LE data: '0cb4ddff-a545-4401-9d06-688af53e7f84'
  test_uuid: cmp test #10 failed on LE data: '0cb4ddff-a545-4401-9d06-688af53e7f84'
  test_uuid: cmp test #10 actual data: '0cb4ddff-a545-4401-9d06-688af53e7f84'
  test_uuid: conversion test #11 failed on BE data: '0cb4ddff-a545-4401-9d06-688af53e7f84'
  test_uuid: cmp test #12 failed on BE data: '0cb4ddff-a545-4401-9d06-688af53e7f84'
  test_uuid: cmp test #12 actual data: '0cb4ddff-a545-4401-9d06-688af53e7f84'
  test_uuid: negative test #13 passed on wrong LE data: 'c33f4995-3701-450e-9fbf206a2e98e576 '
  test_uuid: negative test #14 passed on wrong BE data: 'c33f4995-3701-450e-9fbf206a2e98e576 '
  test_uuid: negative test #15 passed on wrong LE data: '64b4371c-77c1-48f9-8221-29f054XX023b'
  test_uuid: negative test #16 passed on wrong BE data: '64b4371c-77c1-48f9-8221-29f054XX023b'
  test_uuid: negative test #17 passed on wrong LE data: '0cb4ddff-a545-4401-9d06-688af53e'
  test_uuid: negative test #18 passed on wrong BE data: '0cb4ddff-a545-4401-9d06-688af53e'
  test_uuid: failed 18 out of 18 tests


* Now, here's how it looks like with KUnit:

  ======== [PASSED] uuid ========
  [PASSED] uuid_correct_be
  [PASSED] uuid_correct_le
  [PASSED] uuid_wrong_be
  [PASSED] uuid_wrong_le

* And if every test fail with KUnit:

  ======== [FAILED] uuid ========
  [FAILED] uuid_correct_be
      # uuid_correct_be: ASSERTION FAILED at lib/test_uuid.c:57
      Expected uuid_parse(data->uuid, &be) == 1, but
          uuid_parse(data->uuid, &be) == 0
  
  failed to parse 'c33f4995-3701-450e-9fbf-206a2e98e576'
      # uuid_correct_be: not ok 1 - c33f4995-3701-450e-9fbf-206a2e98e576
      # uuid_correct_be: ASSERTION FAILED at lib/test_uuid.c:57
      Expected uuid_parse(data->uuid, &be) == 1, but
          uuid_parse(data->uuid, &be) == 0
  
  failed to parse '64b4371c-77c1-48f9-8221-29f054fc023b'
      # uuid_correct_be: not ok 2 - 64b4371c-77c1-48f9-8221-29f054fc023b
      # uuid_correct_be: ASSERTION FAILED at lib/test_uuid.c:57
      Expected uuid_parse(data->uuid, &be) == 1, but
          uuid_parse(data->uuid, &be) == 0
  
  failed to parse '0cb4ddff-a545-4401-9d06-688af53e7f84'
      # uuid_correct_be: not ok 3 - 0cb4ddff-a545-4401-9d06-688af53e7f84
      not ok 1 - uuid_correct_be
  
  [FAILED] uuid_correct_le
      # uuid_correct_le: ASSERTION FAILED at lib/test_uuid.c:46
      Expected guid_parse(data->uuid, &le) == 1, but
          guid_parse(data->uuid, &le) == 0
  
  failed to parse 'c33f4995-3701-450e-9fbf-206a2e98e576'
      # uuid_correct_le: not ok 1 - c33f4995-3701-450e-9fbf-206a2e98e576
      # uuid_correct_le: ASSERTION FAILED at lib/test_uuid.c:46
      Expected guid_parse(data->uuid, &le) == 1, but
          guid_parse(data->uuid, &le) == 0
  
  failed to parse '64b4371c-77c1-48f9-8221-29f054fc023b'
      # uuid_correct_le: not ok 2 - 64b4371c-77c1-48f9-8221-29f054fc023b
      # uuid_correct_le: ASSERTION FAILED at lib/test_uuid.c:46
      Expected guid_parse(data->uuid, &le) == 1, but
          guid_parse(data->uuid, &le) == 0
  
  failed to parse '0cb4ddff-a545-4401-9d06-688af53e7f84'
      # uuid_correct_le: not ok 3 - 0cb4ddff-a545-4401-9d06-688af53e7f84
      not ok 2 - uuid_correct_le
  
  [FAILED] uuid_wrong_be
      # uuid_wrong_be: ASSERTION FAILED at lib/test_uuid.c:77
      Expected uuid_parse(*data, &be) == 0, but
          uuid_parse(*data, &be) == -22
  
  parsing of 'c33f4995-3701-450e-9fbf206a2e98e576 ' should've failed
      # uuid_wrong_be: not ok 1 - c33f4995-3701-450e-9fbf206a2e98e576
      # uuid_wrong_be: ASSERTION FAILED at lib/test_uuid.c:77
      Expected uuid_parse(*data, &be) == 0, but
          uuid_parse(*data, &be) == -22
  
  parsing of '64b4371c-77c1-48f9-8221-29f054XX023b' should've failed
      # uuid_wrong_be: not ok 2 - 64b4371c-77c1-48f9-8221-29f054XX023b
      # uuid_wrong_be: ASSERTION FAILED at lib/test_uuid.c:77
      Expected uuid_parse(*data, &be) == 0, but
          uuid_parse(*data, &be) == -22
  
  parsing of '0cb4ddff-a545-4401-9d06-688af53e' should've failed
      # uuid_wrong_be: not ok 3 - 0cb4ddff-a545-4401-9d06-688af53e
      not ok 3 - uuid_wrong_be
  
  [FAILED] uuid_wrong_le
      # uuid_wrong_le: ASSERTION FAILED at lib/test_uuid.c:68
      Expected guid_parse(*data, &le) == 0, but
          guid_parse(*data, &le) == -22
  
  parsing of 'c33f4995-3701-450e-9fbf206a2e98e576 ' should've failed
      # uuid_wrong_le: not ok 1 - c33f4995-3701-450e-9fbf206a2e98e576
      # uuid_wrong_le: ASSERTION FAILED at lib/test_uuid.c:68
      Expected guid_parse(*data, &le) == 0, but
          guid_parse(*data, &le) == -22
  
  parsing of '64b4371c-77c1-48f9-8221-29f054XX023b' should've failed
      # uuid_wrong_le: not ok 2 - 64b4371c-77c1-48f9-8221-29f054XX023b
      # uuid_wrong_le: ASSERTION FAILED at lib/test_uuid.c:68
      Expected guid_parse(*data, &le) == 0, but
          guid_parse(*data, &le) == -22
  
  parsing of '0cb4ddff-a545-4401-9d06-688af53e' should've failed
      # uuid_wrong_le: not ok 3 - 0cb4ddff-a545-4401-9d06-688af53e
      not ok 4 - uuid_wrong_le

Changes from v2:
 - Clarify in commit message the new test cases setup
v2: https://lore.kernel.org/lkml/20210609233730.164082-1-andrealmeid@collabora.com/

Changes from v1:
 - Test suite name: uuid_test -> uuid
 - Config name: TEST_UUID -> UUID_KUNIT_TEST
 - Config entry in the Kconfig file left where it is
 - Converted tests to use _MSG variant
v1: https://lore.kernel.org/lkml/20210605215215.171165-1-andrealmeid@collabora.com/

André Almeida (1):
  lib: Convert UUID runtime test to KUnit

 lib/Kconfig.debug |  11 +++-
 lib/Makefile      |   2 +-
 lib/test_uuid.c   | 137 +++++++++++++++++++---------------------------
 3 files changed, 67 insertions(+), 83 deletions(-)

-- 
2.31.1

[PATCH v3 1/1] lib: Convert UUID runtime test to KUnit

[André Almeida]

Remove custom functions for testing and use KUnit framework. Keep the
tested functions and test data the same.

Current test threat (g/u)uid_parse and (g/u)uid_equal as different test
cases. Make both functions being part of the same test case, given the
dependency regarding their results. This reduces the tests cases from 6
cases to 4, while keeping the test coverage the same. Given that we have
3 strings for each test case, current test output notifies 18 tests
results, and the KUnit output announces 12 results.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
---
 lib/Kconfig.debug |  11 +++-
 lib/Makefile      |   2 +-
 lib/test_uuid.c   | 137 +++++++++++++++++++---------------------------
 3 files changed, 67 insertions(+), 83 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 678c13967580..1d879197f303 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2188,8 +2188,15 @@ config TEST_BITMAP
 
 	  If unsure, say N.
 
-config TEST_UUID
-	tristate "Test functions located in the uuid module at runtime"
+config UUID_KUNIT_TEST
+	tristate "Unit test for UUID" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	help
+	  This builds the UUID unit test.
+	  Tests parsing functions for UUID/GUID strings.
+
+	  If unsure, say N.
 
 config TEST_XARRAY
 	tristate "Test the XArray code at runtime"
diff --git a/lib/Makefile b/lib/Makefile
index 2cc359ec1fdd..cc19048961c0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -85,7 +85,6 @@ obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
 obj-$(CONFIG_TEST_PRINTF) += test_printf.o
 obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
 obj-$(CONFIG_TEST_STRSCPY) += test_strscpy.o
-obj-$(CONFIG_TEST_UUID) += test_uuid.o
 obj-$(CONFIG_TEST_XARRAY) += test_xarray.o
 obj-$(CONFIG_TEST_PARMAN) += test_parman.o
 obj-$(CONFIG_TEST_KMOD) += test_kmod.o
@@ -354,5 +353,6 @@ obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
 obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
 obj-$(CONFIG_BITS_TEST) += test_bits.o
 obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
+obj-$(CONFIG_UUID_KUNIT_TEST) += test_uuid.o
 
 obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
diff --git a/lib/test_uuid.c b/lib/test_uuid.c
index cd819c397dc7..65394ec5501e 100644
--- a/lib/test_uuid.c
+++ b/lib/test_uuid.c
@@ -1,21 +1,20 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
 /*
- * Test cases for lib/uuid.c module.
+ * Unit tests for lib/uuid.c module.
+ *
+ * Copyright 2016 Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ * Copyright 2021 André Almeida <andrealmeid@riseup.net>
  */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/string.h>
+#include <kunit/test.h>
 #include <linux/uuid.h>
 
-struct test_uuid_data {
+struct test_data {
 	const char *uuid;
 	guid_t le;
 	uuid_t be;
 };
 
-static const struct test_uuid_data test_uuid_test_data[] = {
+static const struct test_data correct_data[] = {
 	{
 		.uuid = "c33f4995-3701-450e-9fbf-206a2e98e576",
 		.le = GUID_INIT(0xc33f4995, 0x3701, 0x450e, 0x9f, 0xbf, 0x20, 0x6a, 0x2e, 0x98, 0xe5, 0x76),
@@ -33,101 +32,79 @@ static const struct test_uuid_data test_uuid_test_data[] = {
 	},
 };
 
-static const char * const test_uuid_wrong_data[] = {
+static const char * const wrong_data[] = {
 	"c33f4995-3701-450e-9fbf206a2e98e576 ",	/* no hyphen(s) */
 	"64b4371c-77c1-48f9-8221-29f054XX023b",	/* invalid character(s) */
 	"0cb4ddff-a545-4401-9d06-688af53e",	/* not enough data */
 };
 
-static unsigned total_tests __initdata;
-static unsigned failed_tests __initdata;
-
-static void __init test_uuid_failed(const char *prefix, bool wrong, bool be,
-				    const char *data, const char *actual)
+static void uuid_correct_le(struct kunit *test)
 {
-	pr_err("%s test #%u %s %s data: '%s'\n",
-	       prefix,
-	       total_tests,
-	       wrong ? "passed on wrong" : "failed on",
-	       be ? "BE" : "LE",
-	       data);
-	if (actual && *actual)
-		pr_err("%s test #%u actual data: '%s'\n",
-		       prefix,
-		       total_tests,
-		       actual);
-	failed_tests++;
+	guid_t le;
+	const struct test_data *data = (const struct test_data *)(test->param_value);
+
+	KUNIT_ASSERT_EQ_MSG(test, guid_parse(data->uuid, &le), 0,
+			    "failed to parse '%s'", data->uuid);
+	KUNIT_EXPECT_TRUE_MSG(test, guid_equal(&data->le, &le),
+			      "'%s' should be equal to %pUl", data->uuid, &le);
 }
 
-static void __init test_uuid_test(const struct test_uuid_data *data)
+static void uuid_correct_be(struct kunit *test)
 {
-	guid_t le;
 	uuid_t be;
-	char buf[48];
-
-	/* LE */
-	total_tests++;
-	if (guid_parse(data->uuid, &le))
-		test_uuid_failed("conversion", false, false, data->uuid, NULL);
-
-	total_tests++;
-	if (!guid_equal(&data->le, &le)) {
-		sprintf(buf, "%pUl", &le);
-		test_uuid_failed("cmp", false, false, data->uuid, buf);
-	}
-
-	/* BE */
-	total_tests++;
-	if (uuid_parse(data->uuid, &be))
-		test_uuid_failed("conversion", false, true, data->uuid, NULL);
-
-	total_tests++;
-	if (!uuid_equal(&data->be, &be)) {
-		sprintf(buf, "%pUb", &be);
-		test_uuid_failed("cmp", false, true, data->uuid, buf);
-	}
+	const struct test_data *data = (const struct test_data *)(test->param_value);
+
+	KUNIT_ASSERT_EQ_MSG(test, uuid_parse(data->uuid, &be), 0,
+			    "failed to parse '%s'", data->uuid);
+	KUNIT_EXPECT_TRUE_MSG(test, uuid_equal(&data->be, &be),
+			      "'%s' should be equal to %pUl", data->uuid, &be);
 }
 
-static void __init test_uuid_wrong(const char *data)
+static void uuid_wrong_le(struct kunit *test)
 {
 	guid_t le;
-	uuid_t be;
-
-	/* LE */
-	total_tests++;
-	if (!guid_parse(data, &le))
-		test_uuid_failed("negative", true, false, data, NULL);
+	const char **data = (const char **)(test->param_value);
 
-	/* BE */
-	total_tests++;
-	if (!uuid_parse(data, &be))
-		test_uuid_failed("negative", true, true, data, NULL);
+	KUNIT_ASSERT_NE_MSG(test, guid_parse(*data, &le), 0,
+			    "parsing of '%s' should've failed", *data);
 }
 
-static int __init test_uuid_init(void)
+static void uuid_wrong_be(struct kunit *test)
 {
-	unsigned int i;
-
-	for (i = 0; i < ARRAY_SIZE(test_uuid_test_data); i++)
-		test_uuid_test(&test_uuid_test_data[i]);
-
-	for (i = 0; i < ARRAY_SIZE(test_uuid_wrong_data); i++)
-		test_uuid_wrong(test_uuid_wrong_data[i]);
+	uuid_t be;
+	const char **data = (const char **)(test->param_value);
 
-	if (failed_tests == 0)
-		pr_info("all %u tests passed\n", total_tests);
-	else
-		pr_err("failed %u out of %u tests\n", failed_tests, total_tests);
+	KUNIT_ASSERT_NE_MSG(test, uuid_parse(*data, &be), 0,
+			    "parsing of '%s' should've failed", *data);
+}
 
-	return failed_tests ? -EINVAL : 0;
+static void case_to_desc_correct(const struct test_data *t, char *desc)
+{
+	strcpy(desc, t->uuid);
 }
-module_init(test_uuid_init);
 
-static void __exit test_uuid_exit(void)
+KUNIT_ARRAY_PARAM(correct, correct_data, case_to_desc_correct);
+
+static void case_to_desc_wrong(const char * const *s, char *desc)
 {
-	/* do nothing */
+	strcpy(desc, *s);
 }
-module_exit(test_uuid_exit);
+
+KUNIT_ARRAY_PARAM(wrong, wrong_data, case_to_desc_wrong);
+
+static struct kunit_case uuid_test_cases[] = {
+	KUNIT_CASE_PARAM(uuid_correct_be, correct_gen_params),
+	KUNIT_CASE_PARAM(uuid_correct_le, correct_gen_params),
+	KUNIT_CASE_PARAM(uuid_wrong_be, wrong_gen_params),
+	KUNIT_CASE_PARAM(uuid_wrong_le, wrong_gen_params),
+	{}
+};
+
+static struct kunit_suite uuid_test_suite = {
+	.name = "uuid",
+	.test_cases = uuid_test_cases,
+};
+kunit_test_suite(uuid_test_suite);
 
 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 MODULE_LICENSE("Dual BSD/GPL");
-- 
2.32.0

Re: [PATCH v3 0/1] lib: Convert UUID runtime test to KUnit

[Andy Shevchenko]

On Thu, Jun 10, 2021 at 01:39:58PM -0300, André Almeida wrote:
> Hi,
> 
> This patch converts existing UUID runtime test to use KUnit framework.
> 
> Below, there's a comparison between the old output format and the new
> one. Keep in mind that even if KUnit seems very verbose, this is the
> corner case where _every_ test has failed.

Btw, do we have test coverage statistics?

I mean since we reduced 18 test cases to 12, do we still have the same / better
test coverage?

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 0/1] lib: Convert UUID runtime test to KUnit

[André Almeida]

Hi Andy,

Às 06:55 de 11/06/21, Andy Shevchenko escreveu:
> On Thu, Jun 10, 2021 at 01:39:58PM -0300, André Almeida wrote:
>> Hi,
>>
>> This patch converts existing UUID runtime test to use KUnit framework.
>>
>> Below, there's a comparison between the old output format and the new
>> one. Keep in mind that even if KUnit seems very verbose, this is the
>> corner case where _every_ test has failed.
> 
> Btw, do we have test coverage statistics?
> 
> I mean since we reduced 18 test cases to 12, do we still have the same / better
> test coverage?
> 
I don't think we have automated statistics, but I can assure you that
the coverage it's exactly the same. We are testing two correlated
functions with the same input, in a single test case, instead of having
a single case for each one, so that's why the number of cases is reduced.

For example, instead of:

	total_tests++;
	if (guid_parse(data->uuid, &le))


	total_tests++;
	if (!guid_equal(&data->le, &le))

We now have:

	KUNIT_ASSERT_EQ(guid_parse(data->guid, &le), 0)
	KUNIT_EXPECT_TRUE(guid_equal(&data->le, &le))

That will count as a single test.

Re: [PATCH v3 1/1] lib: Convert UUID runtime test to KUnit

[Christoph Hellwig]

> +config UUID_KUNIT_TEST
> +	tristate "Unit test for UUID" if !KUNIT_ALL_TESTS
> +	depends on KUNIT
> +	default KUNIT_ALL_TESTS
> +	help
> +	  This builds the UUID unit test.

Does this first help line really add any value if we have this second
line:

> +	  Tests parsing functions for UUID/GUID strings.

?

> +	  If unsure, say N.

Not specific to this case, but IMHO we can drop this line for all kunit
tests as it is completely obvious.

> @@ -354,5 +353,6 @@ obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
>  obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
>  obj-$(CONFIG_BITS_TEST) += test_bits.o
>  obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
> +obj-$(CONFIG_UUID_KUNIT_TEST) += test_uuid.o

Another meta-comment on the kunit tests:  Wouldn't it make more sense
to name them all as CONFIG_KUNIT_TEST_FOO to allow for easier grepping?

> -struct test_uuid_data {
> +struct test_data {
>  	const char *uuid;
>  	guid_t le;
>  	uuid_t be;
>  };
>  
> -static const struct test_uuid_data test_uuid_test_data[] = {
> +static const struct test_data correct_data[] = {

What is the reason for these renames?  Is this a pattern used for
other kunit tests?

> +static void uuid_correct_le(struct kunit *test)
>  {
> +	guid_t le;
> +	const struct test_data *data = (const struct test_data *)(test->param_value);

Overly long line.  But as far as I can tell there is no need for the
case that causes this mess anyway given that param_value is a
"const void *".

Same for all the other instances of this.

> +static void uuid_wrong_le(struct kunit *test)
>  {
>  	guid_t le;
> +	const char **data = (const char **)(test->param_value);

No need for the second pair of braces.  Same for various other instances.

Re: [PATCH v3 1/1] lib: Convert UUID runtime test to KUnit

[Daniel Latypov]

On Sun, Jun 13, 2021 at 11:42 PM Christoph Hellwig <hch@lst.de> wrote:
>
> > +config UUID_KUNIT_TEST
> > +     tristate "Unit test for UUID" if !KUNIT_ALL_TESTS
> > +     depends on KUNIT
> > +     default KUNIT_ALL_TESTS
> > +     help
> > +       This builds the UUID unit test.
>
> Does this first help line really add any value if we have this second
> line:
>
> > +       Tests parsing functions for UUID/GUID strings.
>
> ?
>
> > +       If unsure, say N.
>
> Not specific to this case, but IMHO we can drop this line for all kunit
> tests as it is completely obvious.
>
> > @@ -354,5 +353,6 @@ obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
> >  obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
> >  obj-$(CONFIG_BITS_TEST) += test_bits.o
> >  obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
> > +obj-$(CONFIG_UUID_KUNIT_TEST) += test_uuid.o
>
> Another meta-comment on the kunit tests:  Wouldn't it make more sense
> to name them all as CONFIG_KUNIT_TEST_FOO to allow for easier grepping?

But putting them in a "kunit namespace" by prefixing them as such
would be misleading, IMO.
The tests live adjacent to the code they test and are owned by the
same maintainers, or at least that's the intent.

And if the goal is just to find configs, then I don't see much
difference between "config.*KUNIT_TEST" and "config KUNIT_TEST.*"

>
> > -struct test_uuid_data {
> > +struct test_data {
> >       const char *uuid;
> >       guid_t le;
> >       uuid_t be;
> >  };
> >
> > -static const struct test_uuid_data test_uuid_test_data[] = {
> > +static const struct test_data correct_data[] = {
>
> What is the reason for these renames?  Is this a pattern used for
> other kunit tests?

No, this is not a pattern.
The structs can be renamed back.

>
> > +static void uuid_correct_le(struct kunit *test)
> >  {
> > +     guid_t le;
> > +     const struct test_data *data = (const struct test_data *)(test->param_value);
>
> Overly long line.  But as far as I can tell there is no need for the
> case that causes this mess anyway given that param_value is a
> "const void *".

There is no need for the cast or the brace, yes.
This is my fault.

The documentation has both since I had thought that would make how it
works more clear:
https://www.kernel.org/doc/html/latest/dev-tools/kunit/usage.html#parameterized-testing
I don't really understand my past thought process...

>
> Same for all the other instances of this.
>
> > +static void uuid_wrong_le(struct kunit *test)
> >  {
> >       guid_t le;
> > +     const char **data = (const char **)(test->param_value);
>
> No need for the second pair of braces.  Same for various other instances.

Re: [PATCH v3 1/1] lib: Convert UUID runtime test to KUnit

[André Almeida]

Às 13:55 de 14/06/21, Daniel Latypov escreveu:
> On Sun, Jun 13, 2021 at 11:42 PM Christoph Hellwig <hch@lst.de> wrote:
>>
>>> +config UUID_KUNIT_TEST
>>> +     tristate "Unit test for UUID" if !KUNIT_ALL_TESTS
>>> +     depends on KUNIT
>>> +     default KUNIT_ALL_TESTS
>>> +     help
>>> +       This builds the UUID unit test.
>>
>> Does this first help line really add any value if we have this second
>> line:
>>
>>> +       Tests parsing functions for UUID/GUID strings.
>>
>> ?
>>
>>> +       If unsure, say N.
>>
>> Not specific to this case, but IMHO we can drop this line for all kunit
>> tests as it is completely obvious.
>>
>>> @@ -354,5 +353,6 @@ obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
>>>  obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
>>>  obj-$(CONFIG_BITS_TEST) += test_bits.o
>>>  obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
>>> +obj-$(CONFIG_UUID_KUNIT_TEST) += test_uuid.o
>>
>> Another meta-comment on the kunit tests:  Wouldn't it make more sense
>> to name them all as CONFIG_KUNIT_TEST_FOO to allow for easier grepping?
> 
> But putting them in a "kunit namespace" by prefixing them as such
> would be misleading, IMO.
> The tests live adjacent to the code they test and are owned by the
> same maintainers, or at least that's the intent.
> 
> And if the goal is just to find configs, then I don't see much
> difference between "config.*KUNIT_TEST" and "config KUNIT_TEST.*"
> 
>>
>>> -struct test_uuid_data {
>>> +struct test_data {
>>>       const char *uuid;
>>>       guid_t le;
>>>       uuid_t be;
>>>  };
>>>
>>> -static const struct test_uuid_data test_uuid_test_data[] = {
>>> +static const struct test_data correct_data[] = {
>>
>> What is the reason for these renames?  Is this a pattern used for
>> other kunit tests?
> 
> No, this is not a pattern.
> The structs can be renamed back.
> 

The idea behind this renaming is to be more explicit about what this
data is about: correct UUIDs inputs.

>>
>>> +static void uuid_correct_le(struct kunit *test)
>>>  {
>>> +     guid_t le;
>>> +     const struct test_data *data = (const struct test_data *)(test->param_value);
>>
>> Overly long line.  But as far as I can tell there is no need for the
>> case that causes this mess anyway given that param_value is a
>> "const void *".
> 
> There is no need for the cast or the brace, yes.
> This is my fault.
> 
> The documentation has both since I had thought that would make how it
> works more clear:
> https://www.kernel.org/doc/html/latest/dev-tools/kunit/usage.html#parameterized-testing
> I don't really understand my past thought process...
> 

Ok, I'll change my code to remove the cast and braces. I can also send a
patch to rework this part of documentation.

>>
>> Same for all the other instances of this.
>>
>>> +static void uuid_wrong_le(struct kunit *test)
>>>  {
>>>       guid_t le;
>>> +     const char **data = (const char **)(test->param_value);
>>
>> No need for the second pair of braces.  Same for various other instances.