229 lines
7.5 KiB
C
229 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* KUnit test for the linear_ranges helper.
|
|
*
|
|
* Copyright (C) 2020, ROHM Semiconductors.
|
|
* Author: Matti Vaittinen <matti.vaittien@fi.rohmeurope.com>
|
|
*/
|
|
#include <kunit/test.h>
|
|
|
|
#include <linux/linear_range.h>
|
|
|
|
/* First things first. I deeply dislike unit-tests. I have seen all the hell
|
|
* breaking loose when people who think the unit tests are "the silver bullet"
|
|
* to kill bugs get to decide how a company should implement testing strategy...
|
|
*
|
|
* Believe me, it may get _really_ ridiculous. It is tempting to think that
|
|
* walking through all the possible execution branches will nail down 100% of
|
|
* bugs. This may lead to ideas about demands to get certain % of "test
|
|
* coverage" - measured as line coverage. And that is one of the worst things
|
|
* you can do.
|
|
*
|
|
* Ask people to provide line coverage and they do. I've seen clever tools
|
|
* which generate test cases to test the existing functions - and by default
|
|
* these tools expect code to be correct and just generate checks which are
|
|
* passing when ran against current code-base. Run this generator and you'll get
|
|
* tests that do not test code is correct but just verify nothing changes.
|
|
* Problem is that testing working code is pointless. And if it is not
|
|
* working, your test must not assume it is working. You won't catch any bugs
|
|
* by such tests. What you can do is to generate a huge amount of tests.
|
|
* Especially if you were are asked to proivde 100% line-coverage x_x. So what
|
|
* does these tests - which are not finding any bugs now - do?
|
|
*
|
|
* They add inertia to every future development. I think it was Terry Pratchet
|
|
* who wrote someone having same impact as thick syrup has to chronometre.
|
|
* Excessive amount of unit-tests have this effect to development. If you do
|
|
* actually find _any_ bug from code in such environment and try fixing it...
|
|
* ...chances are you also need to fix the test cases. In sunny day you fix one
|
|
* test. But I've done refactoring which resulted 500+ broken tests (which had
|
|
* really zero value other than proving to managers that we do do "quality")...
|
|
*
|
|
* After this being said - there are situations where UTs can be handy. If you
|
|
* have algorithms which take some input and should produce output - then you
|
|
* can implement few, carefully selected simple UT-cases which test this. I've
|
|
* previously used this for example for netlink and device-tree data parsing
|
|
* functions. Feed some data examples to functions and verify the output is as
|
|
* expected. I am not covering all the cases but I will see the logic should be
|
|
* working.
|
|
*
|
|
* Here we also do some minor testing. I don't want to go through all branches
|
|
* or test more or less obvious things - but I want to see the main logic is
|
|
* working. And I definitely don't want to add 500+ test cases that break when
|
|
* some simple fix is done x_x. So - let's only add few, well selected tests
|
|
* which ensure as much logic is good as possible.
|
|
*/
|
|
|
|
/*
|
|
* Test Range 1:
|
|
* selectors: 2 3 4 5 6
|
|
* values (5): 10 20 30 40 50
|
|
*
|
|
* Test Range 2:
|
|
* selectors: 7 8 9 10
|
|
* values (4): 100 150 200 250
|
|
*/
|
|
|
|
#define RANGE1_MIN 10
|
|
#define RANGE1_MIN_SEL 2
|
|
#define RANGE1_STEP 10
|
|
|
|
/* 2, 3, 4, 5, 6 */
|
|
static const unsigned int range1_sels[] = { RANGE1_MIN_SEL, RANGE1_MIN_SEL + 1,
|
|
RANGE1_MIN_SEL + 2,
|
|
RANGE1_MIN_SEL + 3,
|
|
RANGE1_MIN_SEL + 4 };
|
|
/* 10, 20, 30, 40, 50 */
|
|
static const unsigned int range1_vals[] = { RANGE1_MIN, RANGE1_MIN +
|
|
RANGE1_STEP,
|
|
RANGE1_MIN + RANGE1_STEP * 2,
|
|
RANGE1_MIN + RANGE1_STEP * 3,
|
|
RANGE1_MIN + RANGE1_STEP * 4 };
|
|
|
|
#define RANGE2_MIN 100
|
|
#define RANGE2_MIN_SEL 7
|
|
#define RANGE2_STEP 50
|
|
|
|
/* 7, 8, 9, 10 */
|
|
static const unsigned int range2_sels[] = { RANGE2_MIN_SEL, RANGE2_MIN_SEL + 1,
|
|
RANGE2_MIN_SEL + 2,
|
|
RANGE2_MIN_SEL + 3 };
|
|
/* 100, 150, 200, 250 */
|
|
static const unsigned int range2_vals[] = { RANGE2_MIN, RANGE2_MIN +
|
|
RANGE2_STEP,
|
|
RANGE2_MIN + RANGE2_STEP * 2,
|
|
RANGE2_MIN + RANGE2_STEP * 3 };
|
|
|
|
#define RANGE1_NUM_VALS (ARRAY_SIZE(range1_vals))
|
|
#define RANGE2_NUM_VALS (ARRAY_SIZE(range2_vals))
|
|
#define RANGE_NUM_VALS (RANGE1_NUM_VALS + RANGE2_NUM_VALS)
|
|
|
|
#define RANGE1_MAX_SEL (RANGE1_MIN_SEL + RANGE1_NUM_VALS - 1)
|
|
#define RANGE1_MAX_VAL (range1_vals[RANGE1_NUM_VALS - 1])
|
|
|
|
#define RANGE2_MAX_SEL (RANGE2_MIN_SEL + RANGE2_NUM_VALS - 1)
|
|
#define RANGE2_MAX_VAL (range2_vals[RANGE2_NUM_VALS - 1])
|
|
|
|
#define SMALLEST_SEL RANGE1_MIN_SEL
|
|
#define SMALLEST_VAL RANGE1_MIN
|
|
|
|
static struct linear_range testr[] = {
|
|
{
|
|
.min = RANGE1_MIN,
|
|
.min_sel = RANGE1_MIN_SEL,
|
|
.max_sel = RANGE1_MAX_SEL,
|
|
.step = RANGE1_STEP,
|
|
}, {
|
|
.min = RANGE2_MIN,
|
|
.min_sel = RANGE2_MIN_SEL,
|
|
.max_sel = RANGE2_MAX_SEL,
|
|
.step = RANGE2_STEP
|
|
},
|
|
};
|
|
|
|
static void range_test_get_value(struct kunit *test)
|
|
{
|
|
int ret, i;
|
|
unsigned int sel, val;
|
|
|
|
for (i = 0; i < RANGE1_NUM_VALS; i++) {
|
|
sel = range1_sels[i];
|
|
ret = linear_range_get_value_array(&testr[0], 2, sel, &val);
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_EQ(test, val, range1_vals[i]);
|
|
}
|
|
for (i = 0; i < RANGE2_NUM_VALS; i++) {
|
|
sel = range2_sels[i];
|
|
ret = linear_range_get_value_array(&testr[0], 2, sel, &val);
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_EQ(test, val, range2_vals[i]);
|
|
}
|
|
ret = linear_range_get_value_array(&testr[0], 2, sel + 1, &val);
|
|
KUNIT_EXPECT_NE(test, 0, ret);
|
|
}
|
|
|
|
static void range_test_get_selector_high(struct kunit *test)
|
|
{
|
|
int ret, i;
|
|
unsigned int sel;
|
|
bool found;
|
|
|
|
for (i = 0; i < RANGE1_NUM_VALS; i++) {
|
|
ret = linear_range_get_selector_high(&testr[0], range1_vals[i],
|
|
&sel, &found);
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_EQ(test, sel, range1_sels[i]);
|
|
KUNIT_EXPECT_TRUE(test, found);
|
|
}
|
|
|
|
ret = linear_range_get_selector_high(&testr[0], RANGE1_MAX_VAL + 1,
|
|
&sel, &found);
|
|
KUNIT_EXPECT_LE(test, ret, 0);
|
|
|
|
ret = linear_range_get_selector_high(&testr[0], RANGE1_MIN - 1,
|
|
&sel, &found);
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_FALSE(test, found);
|
|
KUNIT_EXPECT_EQ(test, sel, range1_sels[0]);
|
|
}
|
|
|
|
static void range_test_get_value_amount(struct kunit *test)
|
|
{
|
|
int ret;
|
|
|
|
ret = linear_range_values_in_range_array(&testr[0], 2);
|
|
KUNIT_EXPECT_EQ(test, (int)RANGE_NUM_VALS, ret);
|
|
}
|
|
|
|
static void range_test_get_selector_low(struct kunit *test)
|
|
{
|
|
int i, ret;
|
|
unsigned int sel;
|
|
bool found;
|
|
|
|
for (i = 0; i < RANGE1_NUM_VALS; i++) {
|
|
ret = linear_range_get_selector_low_array(&testr[0], 2,
|
|
range1_vals[i], &sel,
|
|
&found);
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_EQ(test, sel, range1_sels[i]);
|
|
KUNIT_EXPECT_TRUE(test, found);
|
|
}
|
|
for (i = 0; i < RANGE2_NUM_VALS; i++) {
|
|
ret = linear_range_get_selector_low_array(&testr[0], 2,
|
|
range2_vals[i], &sel,
|
|
&found);
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_EQ(test, sel, range2_sels[i]);
|
|
KUNIT_EXPECT_TRUE(test, found);
|
|
}
|
|
|
|
/*
|
|
* Seek value greater than range max => get_selector_*_low should
|
|
* return Ok - but set found to false as value is not in range
|
|
*/
|
|
ret = linear_range_get_selector_low_array(&testr[0], 2,
|
|
range2_vals[RANGE2_NUM_VALS - 1] + 1,
|
|
&sel, &found);
|
|
|
|
KUNIT_EXPECT_EQ(test, 0, ret);
|
|
KUNIT_EXPECT_EQ(test, sel, range2_sels[RANGE2_NUM_VALS - 1]);
|
|
KUNIT_EXPECT_FALSE(test, found);
|
|
}
|
|
|
|
static struct kunit_case range_test_cases[] = {
|
|
KUNIT_CASE(range_test_get_value_amount),
|
|
KUNIT_CASE(range_test_get_selector_high),
|
|
KUNIT_CASE(range_test_get_selector_low),
|
|
KUNIT_CASE(range_test_get_value),
|
|
{},
|
|
};
|
|
|
|
static struct kunit_suite range_test_module = {
|
|
.name = "linear-ranges-test",
|
|
.test_cases = range_test_cases,
|
|
};
|
|
|
|
kunit_test_suites(&range_test_module);
|
|
|
|
MODULE_LICENSE("GPL");
|