diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c
index eaa328db55..72ebd5334a 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c
@@ -1910,33 +1910,6 @@ static void test_nib_abr_iter__three_elem_middle_removed(void)
 }
 #endif
 
-/*
- * Creates GNRC_NETIF_NUMOF interfaces and then tries to add another.
- * Expected result: should return NULL
- */
-static void test_nib_iface_get__no_space_left(void)
-{
-    unsigned iface = 1;
-
-    for (int i = 0; i < GNRC_NETIF_NUMOF; i++) {
-        TEST_ASSERT_NOT_NULL(_nib_iface_get(iface++));
-    }
-    TEST_ASSERT_NULL(_nib_iface_get(iface));
-}
-
-/*
- * Creates an interface and then gets the same interface.
- * Expected result: interface pointers should equal
- */
-static void test_nib_iface_get__success(void)
-{
-    _nib_iface_t *ni1, *ni2;
-
-    TEST_ASSERT_NOT_NULL((ni1 = _nib_iface_get(IFACE)));
-    TEST_ASSERT_NOT_NULL((ni2 = _nib_iface_get(IFACE)));
-    TEST_ASSERT(ni1 == ni2);
-}
-
 Test *tests_gnrc_ipv6_nib_internal_tests(void)
 {
     EMB_UNIT_TESTFIXTURES(fixtures) {
@@ -2035,8 +2008,6 @@ Test *tests_gnrc_ipv6_nib_internal_tests(void)
         new_TestFixture(test_nib_abr_iter__three_elem),
         new_TestFixture(test_nib_abr_iter__three_elem_middle_removed),
 #endif
-        new_TestFixture(test_nib_iface_get__no_space_left),
-        new_TestFixture(test_nib_iface_get__success),
     };
 
     EMB_UNIT_TESTCALLER(tests, set_up, NULL,
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c
index c014c9e007..37b68c2aa4 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c
@@ -276,20 +276,12 @@ static void test_nib_nc_mark_reachable__unmanaged(void)
 static void test_nib_nc_mark_reachable__success(void)
 {
     void *iter_state = NULL;
-    _nib_onl_entry_t *node;
-#if GNRC_IPV6_NIB_CONF_ARSM
-    evtimer_msg_event_t *event;
-#endif
-    _nib_iface_t *iface;
     static const ipv6_addr_t addr = { .u64 = { { .u8 = GLOBAL_PREFIX },
                                              { .u64 = TEST_UINT64 } } };
     gnrc_ipv6_nib_nc_t nce;
 
-    TEST_ASSERT_NOT_NULL((node = _nib_nc_add(&addr, IFACE,
-                                             GNRC_IPV6_NIB_NC_INFO_NUD_STATE_UNREACHABLE)));
-    /* set an "infinite" reachability time */
-    iface = _nib_iface_get(_nib_onl_get_if(node));
-    iface->reach_time = UINT32_MAX;
+    TEST_ASSERT_NOT_NULL(_nib_nc_add(&addr, IFACE,
+                                     GNRC_IPV6_NIB_NC_INFO_NUD_STATE_UNREACHABLE));
 
     /* check pre-state */
     TEST_ASSERT(gnrc_ipv6_nib_nc_iter(0, &iter_state, &nce));
@@ -306,11 +298,6 @@ static void test_nib_nc_mark_reachable__success(void)
     /* check if entry is reachable */
     TEST_ASSERT_EQUAL_INT(GNRC_IPV6_NIB_NC_INFO_NUD_STATE_REACHABLE,
                           gnrc_ipv6_nib_nc_get_nud_state(&nce));
-    /* check if there now is an event for reachability timeout of node */
-    TEST_ASSERT_NOT_NULL((event = (evtimer_msg_event_t *)_nib_evtimer.events));
-    TEST_ASSERT_EQUAL_INT(GNRC_IPV6_NIB_REACH_TIMEOUT, event->msg.type);
-    TEST_ASSERT_MESSAGE(node == event->msg.content.ptr,
-                        "event's context is not node");
 #endif
     /* check if still the only entry */
     TEST_ASSERT(!gnrc_ipv6_nib_nc_iter(0, &iter_state, &nce));