tests: skip tests if manager cannot be created

When running without a user session, tests fail.

src/test/test-sched-prio.c

@@ -30,10 +30,16 @@ int main(int argc, char *argv[]) {
         Service *ser;
         FILE *serial = NULL;
         FDSet *fdset = NULL;
+        int r;
 
         /* prepare the test */
         assert_se(set_unit_path(TEST_DIR) >= 0);
-        assert_se(manager_new(SYSTEMD_USER, &m) >= 0);
+        r = manager_new(SYSTEMD_USER, &m);
+        if (r == -EPERM) {
+                puts("manager_new: Permission denied. Skipping test.");
+                return EXIT_SUCCESS;
+        }
+        assert(r >= 0);
         assert_se(manager_startup(m, serial, fdset) >= 0);
 
         /* load idle ok */
@@ -82,5 +88,5 @@ int main(int argc, char *argv[]) {
         assert_se(ser->exec_context.cpu_sched_policy == SCHED_RR);
         assert_se(ser->exec_context.cpu_sched_priority == 99);
 
-        return 0;
+        return EXIT_SUCCESS;
 }

src/test/test-unit-name.c

@@ -111,6 +111,7 @@ static void test_replacements(void) {
 static void test_unit_printf(void) {
         Manager *m;
         Unit *u, *u2;
+        int r;
 
         char _cleanup_free_ *mid, *bid, *host, *root_uid;
         struct passwd *root;
@@ -122,14 +123,19 @@ static void test_unit_printf(void) {
         assert_se((root = getpwnam("root")));
         assert_se(asprintf(&root_uid, "%d", (int) root->pw_uid) > 0);
 
-        assert_se(manager_new(SYSTEMD_USER, &m) == 0);
+        r = manager_new(SYSTEMD_USER, &m);
+        if (r == -EPERM) {
+                puts("manager_new: Permission denied. Skipping test.");
+                return;
+        }
+        assert(r == 0);
 
 #define expect(unit, pattern, expected)                                 \
         {                                                               \
                 char *e;                                                \
                 char _cleanup_free_ *t =                                \
                         unit_full_printf(unit, pattern);                \
-                printf("result: %s\n", t);                              \
+                printf("result: %s\nexpect: %s\n", t, expected);        \
                 if ((e = endswith(expected, "*")))                      \
                         assert(strncmp(t, e, e-expected));              \
                 else                                                    \