diff --git a/Makefile b/Makefile
index b1b4bb4c3..1e05933a7 100644
--- a/Makefile
+++ b/Makefile
@@ -892,6 +892,7 @@ TEST_TARGETS = test_worker_affinity \
                test_orm \
                test_app_resource_limits \
                test_app_named_routes_and_error_handler \
+               test_app_route_helpers \
                test_classic_pool_scaling \
                test_reactor_wake \
                test_reactor_timer \
@@ -1093,6 +1094,10 @@ test_app_named_routes_and_error_handler: $(LIB_NAME) tests/test_app_named_routes
 	$(CC) $(CFLAGS) -o $@ tests/test_app_named_routes_and_error_handler.c $(LIB_NAME) $(LIBS)
 	./$@
 
+test_app_route_helpers: $(LIB_NAME) tests/test_app_route_helpers.c
+	$(CC) $(CFLAGS) -o $@ tests/test_app_route_helpers.c $(LIB_NAME) $(LIBS)
+	./$@
+
 test_classic_pool_scaling: $(LIB_NAME) tests/test_classic_pool_scaling.c
 	$(CC) $(CFLAGS) -o $@ tests/test_classic_pool_scaling.c $(LIB_NAME) $(LIBS)
 	./$@ burst
diff --git a/scripts/ci/api-untested-baseline.txt b/scripts/ci/api-untested-baseline.txt
index c39548123..ad755b5d8 100644
--- a/scripts/ci/api-untested-baseline.txt
+++ b/scripts/ci/api-untested-baseline.txt
@@ -2,23 +2,14 @@
 # was added (2026-10-11). This list may only shrink: v3.9.2 works it down to empty.
 cwist_accept_socket
 cwist_app_configure_bdr
-cwist_app_delete_opt
 cwist_app_enable_metrics
 cwist_app_get_db
 cwist_app_get_db_pool
-cwist_app_get_named
-cwist_app_get_opt
 cwist_app_get_redis_pool
 cwist_app_http_handler
 cwist_app_multiport
-cwist_app_patch_named
-cwist_app_patch_opt
-cwist_app_post_opt
-cwist_app_put_named
-cwist_app_put_opt
 cwist_app_register_error_handler
 cwist_app_set_max_memspace
-cwist_app_set_session_max_age
 cwist_app_set_tls_groups
 cwist_app_static_with_cache
 cwist_app_use_db
diff --git a/tests/test_app_route_helpers.c b/tests/test_app_route_helpers.c
new file mode 100644
index 000000000..180d475fd
--- /dev/null
+++ b/tests/test_app_route_helpers.c
@@ -0,0 +1,184 @@
+/**
+ * @file test_app_route_helpers.c
+ * @brief Smoke tests for the cwist_app_* named/opt route helpers and
+ *        cwist_app_set_session_max_age (issue #390). Registration and lookup
+ *        paths only; no live server is started.
+ */
+#define _POSIX_C_SOURCE 200809L
+#include <cwist/sys/app/app.h>
+#include <cwist/sys/app/endpoint_opts.h>
+#include <cwist/net/http/session.h>
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+static void noop_handler(cwist_http_request *req, cwist_http_response *res) {
+    (void)req;
+    (void)res;
+}
+
+static void test_get_named(void) {
+    printf("test_app_get_named...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_app_get_named(app, "/articles", "articles_list", noop_handler);
+
+    char *url = cwist_url_for(app, "articles_list", NULL);
+    assert(url != NULL);
+    assert(strcmp(url, "/articles") == 0);
+    free(url);
+
+    cwist_app_get_named(NULL, "/x", "x", noop_handler);
+    cwist_app_get_named(app, NULL, "x", noop_handler);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_put_named(void) {
+    printf("test_app_put_named...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_app_put_named(app, "/articles/:id", "articles_replace", noop_handler);
+
+    char *url = cwist_url_for(app, "articles_replace", NULL);
+    assert(url != NULL);
+    assert(strstr(url, "/articles") != NULL);
+    free(url);
+
+    cwist_app_put_named(NULL, "/x", "x", noop_handler);
+    cwist_app_put_named(app, NULL, "x", noop_handler);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_patch_named(void) {
+    printf("test_app_patch_named...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_app_patch_named(app, "/articles/:id", "articles_update", noop_handler);
+
+    char *url = cwist_url_for(app, "articles_update", NULL);
+    assert(url != NULL);
+    assert(strstr(url, "/articles") != NULL);
+    free(url);
+
+    cwist_app_patch_named(NULL, "/x", "x", noop_handler);
+    cwist_app_patch_named(app, NULL, "x", noop_handler);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_get_opt(void) {
+    printf("test_app_get_opt...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_endpoint_opt_t opts = 0;
+    cwist_app_get_opt(app, "/data", noop_handler, opts);
+
+    cwist_app_get_opt(NULL, "/data", noop_handler, opts);
+    cwist_app_get_opt(app, NULL, noop_handler, opts);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_post_opt(void) {
+    printf("test_app_post_opt...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_endpoint_opt_t opts = 0;
+    cwist_app_post_opt(app, "/data", noop_handler, opts);
+
+    cwist_app_post_opt(NULL, "/data", noop_handler, opts);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_put_opt(void) {
+    printf("test_app_put_opt...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_endpoint_opt_t opts = 0;
+    cwist_app_put_opt(app, "/data/:id", noop_handler, opts);
+
+    cwist_app_put_opt(NULL, "/data/:id", noop_handler, opts);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_patch_opt(void) {
+    printf("test_app_patch_opt...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_endpoint_opt_t opts = 0;
+    cwist_app_patch_opt(app, "/data/:id", noop_handler, opts);
+
+    cwist_app_patch_opt(NULL, "/data/:id", noop_handler, opts);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_delete_opt(void) {
+    printf("test_app_delete_opt...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_endpoint_opt_t opts = 0;
+    cwist_app_delete_opt(app, "/data/:id", noop_handler, opts);
+
+    cwist_app_delete_opt(NULL, "/data/:id", noop_handler, opts);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+static void test_set_session_max_age(void) {
+    printf("test_app_set_session_max_age...\n");
+
+    cwist_app *app = cwist_app_create();
+    assert(app != NULL);
+
+    cwist_app_set_session_max_age(app, 3600);
+    cwist_app_set_session_max_age(app, 0);
+
+    /* NULL must not crash. */
+    cwist_app_set_session_max_age(NULL, 3600);
+
+    cwist_app_destroy(app);
+    printf("  OK\n");
+}
+
+int main(void) {
+    test_get_named();
+    test_put_named();
+    test_patch_named();
+    test_get_opt();
+    test_post_opt();
+    test_put_opt();
+    test_patch_opt();
+    test_delete_opt();
+    test_set_session_max_age();
+    printf("All test_app_route_helpers tests passed.\n");
+    return 0;
+}