tests/storage/stream_flash: Add erase range check test

The commit adds test for stream_flash_erase_page range check.

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

Author: de-nordic

tests/subsys/storage/stream/stream_flash/src/main.c

@@ -465,6 +465,25 @@ ZTEST(lib_stream_flash, test_stream_flash_erase_page)
 	zassert_equal(memcmp(&bad_ctx, &cmp_ctx, sizeof(bad_ctx)), 0,
 		      "Ctx should not get altered");
 	zassert_equal(rc, -EINVAL, "Expected failure");
+
+	/* False dev with erase set to NULL to avoid actual erase */
+	fake_api.erase = NULL;
+	struct stream_flash_ctx range_test_ctx = {
+		.offset = 1024,
+		.available = 2048,
+		.fdev = &fake_dev,
+		.last_erased_page_start_offset = -1,
+	};
+
+	rc = stream_flash_erase_page(&range_test_ctx, 1024);
+	zassert_equal(rc, -ENOSYS, "%d No device attached - expected failure", rc);
+
+	rc = stream_flash_erase_page(&range_test_ctx, 1023);
+	zassert_equal(rc, -ERANGE, "Expected failure - offset before designated area");
+
+	rc = stream_flash_erase_page(&range_test_ctx,
+				     range_test_ctx.offset + range_test_ctx.available + 1);
+	zassert_equal(rc, -ERANGE, "Expected failure - offset after designated area");
 }
 #else
 ZTEST(lib_stream_flash, test_stream_flash_erase_page)