[RFC v8 03/10] mm/damon-test: Add more unit tests for 'init_regions'

[SeongJae Park]

From: SeongJae Park <sjp...@amazon.de>

This commit adds more test cases for the new feature, 'init_regions'.

Signed-off-by: SeongJae Park <sjp...@amazon.de>
Reviewed-by: Brendan Higgins <brendanhigg...@google.com>
---
 mm/damon-test.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/mm/damon-test.h b/mm/damon-test.h
index 71413ffc1dcb..e67e8fb17eca 100644
--- a/mm/damon-test.h
+++ b/mm/damon-test.h
@@ -161,6 +161,58 @@ static void damon_test_set_recording(struct kunit *test)
        KUNIT_EXPECT_STREQ(test, ctx->rfile_path, "foo");
 }
 
+static void damon_test_set_init_regions(struct kunit *test)
+{
+       struct damon_ctx *ctx = &damon_user_ctx;
+       unsigned long ids[] = {1, 2, 3};
+       /* Each line represents one region in ``<target id> <start> <end>`` */
+       char * const valid_inputs[] = {"2 10 20\n 2   20 30\n2 35 45",
+               "2 10 20\n",
+               "2 10 20\n1 39 59\n1 70 134\n  2  20 25\n",
+               ""};
+       /* Reading the file again will show sorted, clean output */
+       char * const valid_expects[] = {"2 10 20\n2 20 30\n2 35 45\n",
+               "2 10 20\n",
+               "1 39 59\n1 70 134\n2 10 20\n2 20 25\n",
+               ""};
+       char * const invalid_inputs[] = {"4 10 20\n",   /* target not exists */
+               "2 10 20\n 2 14 26\n",          /* regions overlap */
+               "1 10 20\n2 30 40\n 1 5 8"};    /* not sorted by address */
+       char *input, *expect;
+       int i, rc;
+       char buf[256];
+
+       damon_set_targets(ctx, ids, 3);
+
+       /* Put valid inputs and check the results */
+       for (i = 0; i < ARRAY_SIZE(valid_inputs); i++) {
+               input = valid_inputs[i];
+               expect = valid_expects[i];
+
+               rc = set_init_regions(ctx, input, strnlen(input, 256));
+               KUNIT_EXPECT_EQ(test, rc, 0);
+
+               memset(buf, 0, 256);
+               sprint_init_regions(ctx, buf, 256);
+
+               KUNIT_EXPECT_STREQ(test, (char *)buf, expect);
+       }
+       /* Put invlid inputs and check the return error code */
+       for (i = 0; i < ARRAY_SIZE(invalid_inputs); i++) {
+               input = invalid_inputs[i];
+               pr_info("input: %s\n", input);
+               rc = set_init_regions(ctx, input, strnlen(input, 256));
+               KUNIT_EXPECT_EQ(test, rc, -EINVAL);
+
+               memset(buf, 0, 256);
+               sprint_init_regions(ctx, buf, 256);
+
+               KUNIT_EXPECT_STREQ(test, (char *)buf, "");
+       }
+
+       damon_set_targets(ctx, NULL, 0);
+}
+
 static void __link_vmas(struct vm_area_struct *vmas, ssize_t nr_vmas)
 {
        int i, j;
@@ -645,6 +697,7 @@ static struct kunit_case damon_test_cases[] = {
        KUNIT_CASE(damon_test_regions),
        KUNIT_CASE(damon_test_set_targets),
        KUNIT_CASE(damon_test_set_recording),
+       KUNIT_CASE(damon_test_set_init_regions),
        KUNIT_CASE(damon_test_three_regions_in_vmas),
        KUNIT_CASE(damon_test_aggregate),
        KUNIT_CASE(damon_test_write_rbuf),
-- 
2.17.1