tests/flash_map: Allow custom maps to opt out from some scenarios

The commit modifies the Flash Map test, providing Kconfigs that
allow to opt out from testing disabled partitions and testing
DTS node access.

Signed-off-by: Dominik Ermel <[email protected]>

Author: de-nordic

tests/subsys/storage/flash_map/Kconfig

@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+mainmenu "Flash Map test configuration"
+
+config TEST_FLASH_MAP_DISABLED_PARTITIONS
+	bool "Test support for disabled partitions"
+	default y if !FLASH_MAP_CUSTOM
+	help
+	  Test flash_area_open for returning -ENOENT for disabled partitions.
+	  Note that custom flash maps may not support disabled partitions
+	  and therefore not even generated id for them. In such case it would
+	  not be possible to provide disabled partition id to flash_area_open,
+	  making this test impossible to run.
+
+config TEST_FLASH_MAP_NODE_MACROS
+	bool "Test DTS macros for accessing partition info via DTS node"
+	default y if !FLASH_MAP_CUSTOM
+	help
+	  Custom flash map may be defined outside of DTS definition, therefore
+	  not have a DTS nodes for partitions.
+
+menu "Zephyr"
+source "Kconfig.zephyr"
+endmenu

tests/subsys/storage/flash_map/src/main.c

@@ -25,6 +25,14 @@ struct flash_sector fs_sectors[2048];
 
 ZTEST(flash_map, test_flash_area_disabled_device)
 {
+	/* The test checks if Flash Map will report partition
+	 * non-existend if it is disabled, but it also assumes that
+	 * disabled parition will have an ID generated.
+	 * Custom partition maps may not be generating entries for
+	 * disabled partitions nor identifiers, which makes the
+	 * test fail with custom partition manager, for no real reason.
+	 */
+#if defined(CONFIG_TEST_FLASH_MAP_DISABLED_PARTITIONS)
 	const struct flash_area *fa;
 	int rc;
 
@@ -38,6 +46,9 @@ ZTEST(flash_map, test_flash_area_disabled_device)
 	 * because this macro will fail, at compile time, if node does not
 	 * exist or is disabled.
 	 */
+#else
+	ztest_test_skip();
+#endif
 }
 
 ZTEST(flash_map, test_flash_area_device_is_ready)
@@ -144,6 +155,11 @@ ZTEST(flash_map, test_flash_area_erased_val)
 
 ZTEST(flash_map, test_fixed_partition_node_macros)
 {
+	/* DTS node macros, for accessing fixed partitions, are only available
+	 * for DTS based partitions; custom flash map may define partition outside
+	 * of DTS definition, making the NODE macros fail to evaluate.
+	 */
+#if defined(CONFIG_TEST_FLASH_MAP_NODE_MACROS)
 	/* Test against changes in API */
 	zassert_equal(FIXED_PARTITION_NODE_OFFSET(SLOT1_PARTITION_NODE),
 		DT_REG_ADDR(SLOT1_PARTITION_NODE));
@@ -155,6 +171,9 @@ ZTEST(flash_map, test_fixed_partition_node_macros)
 	/* Taking by node and taking by label should give same device */
 	zassert_equal(FIXED_PARTITION_BY_NODE(DT_NODELABEL(SLOT1_PARTITION)),
 		      FIXED_PARTITION(SLOT1_PARTITION));
+#else
+	ztest_test_skip();
+#endif
 }
 
 ZTEST(flash_map, test_flash_area_erase_and_flatten)