diff --git a/tests/periph_rtt/Kconfig b/tests/periph_rtt/Kconfig
new file mode 100644
index 0000000000..a2d35dbf35
--- /dev/null
+++ b/tests/periph_rtt/Kconfig
@@ -0,0 +1,12 @@
+# Copyright (C) 2021 Otto-von-Guericke-Universität Magdeburg
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+
+config APPLICATION
+    bool
+    default y
+    imply MODULE_PERIPH_RTT_SET_COUNTER
+    depends on TEST_KCONFIG
diff --git a/tests/periph_rtt/Makefile b/tests/periph_rtt/Makefile
index 08887559e5..72bb287f2b 100644
--- a/tests/periph_rtt/Makefile
+++ b/tests/periph_rtt/Makefile
@@ -2,6 +2,7 @@ BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_rtt
+FEATURES_OPTIONAL += periph_rtt_set_counter
 
 DISABLE_MODULE += periph_init_rtt
 
diff --git a/tests/periph_rtt/main.c b/tests/periph_rtt/main.c
index 96e10a5e65..8e9ac8de0f 100644
--- a/tests/periph_rtt/main.c
+++ b/tests/periph_rtt/main.c
@@ -75,10 +75,32 @@ int main(void)
     uint32_t now = rtt_get_counter();
     printf("RTT now: %" PRIu32 "\n", now);
 
+    if (IS_USED(MODULE_PERIPH_RTT_SET_COUNTER)) {
+        puts("Setting RTT timer to 1337");
+        rtt_set_counter(1337);
+        now = rtt_get_counter();
+        printf("RTT now: %" PRIu32 "\n", now);
+        if ((now < 1337) || (now > 1337 + (1 * RTT_FREQUENCY + 999) / 1000)) {
+            puts("ERROR: rtt_set_counter() failed (off by more than 1 ms)");
+            return 1;
+        }
+        else {
+            puts("rtt_set_counter() PASSED");
+        }
+    }
+
     last = (now + TICKS_TO_WAIT) & RTT_MAX_VALUE;
     printf("Setting initial alarm to now + 5 s (%" PRIu32 ")\n", last);
     rtt_set_alarm(last, cb, 0);
 
+    if (rtt_get_alarm() != last) {
+        puts("Error: rtt_get_alarm() not working");
+        return 1;
+    }
+    else {
+        puts("rtt_get_alarm() PASSED");
+    }
+
     puts("Done setting up the RTT, wait for many Hellos");
     return 0;
 }
diff --git a/tests/periph_rtt/tests/01-run.py b/tests/periph_rtt/tests/01-run.py
index 494ecec330..2990071a1b 100755
--- a/tests/periph_rtt/tests/01-run.py
+++ b/tests/periph_rtt/tests/01-run.py
@@ -25,8 +25,8 @@ def testfunc(child):
     child.expect(r'RTT now: \d+')
     child.expect(r'Setting initial alarm to now \+ {} s \(\d+\)'
                  .format(period))
-    child.expect_exact('Done setting up the RTT, wait for many Hellos')
     start = time.time()
+    child.expect_exact('Done setting up the RTT, wait for many Hellos')
     for _ in range(MAX_HELLOS):
         child.expect_exact('Hello\r\n', timeout=period + 1)