test: ftl: add test to check if an exact match works for trace_path()

source/tests/ftl/trace_path.c

@@ -31,7 +31,72 @@ static void test_empty_root(void **state)
 	assert_int_equal(ret, -2);
 }
 
-static void test_trace1(void **state)
+static void test_exact_match(void **state)
+{
+	struct ftl_page_desc descs[] = {
+		{
+			.va = 0xdeadbeef,
+			.subtrees = {
+				[0] = 19,
+				[1] = 21,
+				[2] = 38,
+				[3] = 81,
+				[4] = 24,
+				[5] = 64,
+				[6] = 25,
+				[7] = 15,
+				[8] = 0,
+				[9] = 73,
+				[10] = 49,
+				[11] = 22,
+				[12] = 85,
+				[13] = 45,
+				[14] = 98,
+				[15] = 7,
+				[16] = 72,
+				[17] = 26,
+				[18] = 92,
+				[19] = 16,
+				[20] = 12,
+				[21] = 57,
+				[22] = 52,
+				[23] = 39,
+				[24] = 28,
+				[25] = 42,
+				[26] = 37,
+				[27] = 87,
+				[28] = 5,
+				[29] = 27,
+				[30] = 30,
+				[31] = 47,
+			},
+		},
+	};
+	struct ftl_page_desc ret_page_desc;
+	struct ftl_map map;
+	uint32_t page;
+	int ret;
+
+	(void)state;
+
+	map.log2_page_size = ilog2(4 * KIB);
+	map.root = 75;
+	map.flags = 0;
+
+	expect_value(__wrap_read_page_desc, map, &map);
+	expect_value(__wrap_read_page_desc, upage, 75);
+	will_return(__wrap_read_page_desc, descs);
+	will_return(__wrap_read_page_desc, 0);
+
+	ret = __real_trace_path(&map, &ret_page_desc, &page, 0xdeadbeef);
+
+	assert_int_equal(ret, 0);
+	assert_int_equal(page, 75);
+
+	assert_memory_equal(&ret_page_desc, descs, sizeof ret_page_desc);
+}
+
+static void test_walk(void **state)
 {
 	struct ftl_page_desc descs[] = {
 		{
@@ -127,7 +192,8 @@ int test_trace_path(void)
 {
 	const struct CMUnitTest tests[] = {
 		{ "trace_path: empty root", test_empty_root, NULL, NULL, NULL },
-		{ "trace_path: successful trace", test_trace1, NULL, NULL, NULL },
+		{ "trace_path: exact match", test_exact_match, NULL, NULL, NULL },
+		{ "trace_path: page descriptor walk", test_walk, NULL, NULL, NULL },
 	};
 
 	return cmocka_run_group_tests_name("trace_path", tests, NULL, NULL);