diff --git a/src/include/daos_srv/dlck.h b/src/include/daos_srv/dlck.h
index bcd19874820..f7ef07eccbd 100644
--- a/src/include/daos_srv/dlck.h
+++ b/src/include/daos_srv/dlck.h
@@ -70,4 +70,23 @@ dlck_dtx_act_recs_remove(daos_handle_t coh);
 int
 dlck_dtx_act_recs_set(daos_handle_t coh, d_vector_t *dv);
 
+#ifdef DLCK_UT_BUILD
+#define DLCK_STATIC
+#else
+#define DLCK_STATIC static
+#endif
+
+/**
+ * \struct dlck_iter_bundle
+ *
+ * \brief A bundle of arguments passed to vos_iterate() by the DLCK interfaces.
+ *
+ * Exposed for testing purposes.
+ */
+struct dlck_iter_bundle {
+	daos_handle_t      coh;
+	d_vector_t        *dv;
+	struct dlck_stats *ds;
+};
+
 #endif /* __DAOS_DLCK_H__ */
diff --git a/src/utils/dlck/dlck_dtx_act_recs_recover.c b/src/utils/dlck/dlck_dtx_act_recs_recover.c
index 9eda8b6b387..fea1f6a3083 100644
--- a/src/utils/dlck/dlck_dtx_act_recs_recover.c
+++ b/src/utils/dlck/dlck_dtx_act_recs_recover.c
@@ -13,12 +13,6 @@
 #include "dlck_pool.h"
 #include "dlck_internal.h"
 
-#ifdef DLCK_UT_BUILD
-#define DLCK_STATIC
-#else
-#define DLCK_STATIC static
-#endif
-
 /**
  * Process a single container.
  *
diff --git a/src/utils/dlck/tests/SConscript b/src/utils/dlck/tests/SConscript
index 6616f862d3c..2e9db925b6c 100644
--- a/src/utils/dlck/tests/SConscript
+++ b/src/utils/dlck/tests/SConscript
@@ -14,7 +14,7 @@ def build_dlck_d_vector_ut(venv):
 def build_dlck_dtx_act_recs_recover_ut(venv):
     """Build dlck_dtx_act_recs_recover.c unit test"""
     venv.Append(OBJPREFIX="dlck_ut_")
-    venv.Append(CPPDEFINES={'DLCK_UT_BUILD': '1'})
+    venv.Append(CPPDEFINES=['-DDLCK_UT_BUILD'])
     venv.AppendUnique(RPATH_FULL=['$PREFIX/lib64/daos_srv'])
     venv.AppendUnique(LINKFLAGS=['-Wl,--wrap=d_calloc'])
     venv.AppendUnique(LINKFLAGS=['-Wl,--wrap=vos_cont_open'])
@@ -34,6 +34,27 @@ def build_dlck_dtx_act_recs_recover_ut(venv):
     venv.Install('$PREFIX/bin/', program)
 
 
+def build_dlck_vos_cont_recs_get_active(venv):
+    """Build dlck_vos_cont_recs_get_active() unit test"""
+    venv.Append(OBJPREFIX="dlck_ut_")
+    venv.Append(CPPDEFINES=['-DDAOS_PMEM_BUILD', '-DDLCK_UT_BUILD'])
+    venv.AppendUnique(RPATH_FULL=['$PREFIX/lib64/daos_srv'])
+    venv.require('cmocka', 'argobots')
+    libs = ['cmocka', 'gurt', 'uuid', 'daos_common_pmem', 'abt', 'vea', 'bio']
+    srcs = [
+        'dlck_vos_cont_recs_get_active_ut.c',
+        'vos_mocks.c',
+        '../../../vos/vos_container.c',
+        '../../../vos/vos_gc.c',
+        '../../../vos/vos_space.c',
+        '../../../vos/lru_array.c',
+        '../../../vos/evtree.c',
+    ]
+
+    program = venv.d_test_program('dlck_vos_cont_recs_get_active_ut', srcs, LIBS=libs)
+    venv.Install('$PREFIX/bin/', program)
+
+
 def build_dlck_test_helper(henv):
     """Build dlck_test_helper"""
     henv.Append(OBJPREFIX="dlck_ut_helper_")
@@ -71,6 +92,7 @@ def scons():
 
     build_dlck_d_vector_ut(env.Clone())
     build_dlck_dtx_act_recs_recover_ut(env.Clone())
+    build_dlck_vos_cont_recs_get_active(env.Clone())
     build_dlck_test_helper(env.Clone())
 
 
diff --git a/src/utils/dlck/tests/dlck_dtx_act_recs_recover_ut.c b/src/utils/dlck/tests/dlck_dtx_act_recs_recover_ut.c
index 204c8c3aa18..643fe3224c4 100644
--- a/src/utils/dlck/tests/dlck_dtx_act_recs_recover_ut.c
+++ b/src/utils/dlck/tests/dlck_dtx_act_recs_recover_ut.c
@@ -13,6 +13,7 @@
 
 #include <daos_errno.h>
 
+#include "dlck_tests_common.h"
 #include "../dlck_args.h"
 #include "../dlck_cmds.h"
 #include "../dlck_engine.h"
@@ -20,7 +21,6 @@
 #include "../dlck_pool.h"
 
 #define NO_FILES_RC      (-DER_ENOENT)
-#define GENERIC_ERROR_RC (-DER_MISC)
 #define RANDOM_INT_A     17
 #define RANDOM_INT_B     45
 #define OPEN_MTX_PTR     ((void *)0x310)
diff --git a/src/utils/dlck/tests/dlck_tests_common.h b/src/utils/dlck/tests/dlck_tests_common.h
new file mode 100644
index 00000000000..192ad2992fa
--- /dev/null
+++ b/src/utils/dlck/tests/dlck_tests_common.h
@@ -0,0 +1,12 @@
+/**
+ * (C) Copyright 2025 Hewlett Packard Enterprise Development LP
+ *
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ */
+
+#ifndef __DLCK_TESTS_COMMON__
+#define __DLCK_TESTS_COMMON__
+
+#define GENERIC_ERROR_RC (-DER_MISC)
+
+#endif /** __DLCK_TESTS_COMMON__ */
diff --git a/src/utils/dlck/tests/dlck_vos_cont_recs_get_active_ut.c b/src/utils/dlck/tests/dlck_vos_cont_recs_get_active_ut.c
new file mode 100644
index 00000000000..258e09945f1
--- /dev/null
+++ b/src/utils/dlck/tests/dlck_vos_cont_recs_get_active_ut.c
@@ -0,0 +1,197 @@
+/**
+ * (C) Copyright 2025 Hewlett Packard Enterprise Development LP
+ *
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ */
+
+#define D_LOGFAC DD_FAC(tests)
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#include <daos_errno.h>
+#include <daos_types.h>
+#include <daos_srv/d_vector.h>
+#include <daos_srv/dlck.h>
+#include <daos_srv/vos_types.h>
+
+#include "dlck_tests_common.h"
+
+/** non-public definitions */
+
+int
+dlck_rec_get_active_cb(daos_handle_t ih, vos_iter_entry_t *entry, vos_iter_type_t type,
+		       vos_iter_param_t *param, void *cb_arg, unsigned int *acts);
+
+/** mocks */
+
+#define COH_MOCK_INIT                                                                              \
+	{                                                                                          \
+		.cookie = 0x300413                                                                 \
+	}
+#define ENTRY_MOCK    ((vos_iter_entry_t *)0xE4141)
+#define PARAM_MOCK    ((vos_iter_param_t *)0x5A4A3)
+#define ACTS_MOCK     ((unsigned int *)0xAC15)
+#define VOS_ITER_MOCK ((struct vos_iterator *)0xC0511E4)
+#define DV_MOCK       ((d_vector_t *)0xDCE0C4)
+
+/** globals */
+
+static const daos_handle_t    Coh = COH_MOCK_INIT;
+static struct dlck_stats      Stats;
+static const vos_iter_param_t Param = {
+    .ip_hdl   = COH_MOCK_INIT,
+    .ip_epr   = {.epr_hi = DAOS_EPOCH_MAX},
+    .ip_flags = VOS_IT_FOR_CHECK,
+};
+static const struct vos_iter_anchors Anchors_zeroed;
+static const struct dlck_iter_bundle Bundle = {.coh = COH_MOCK_INIT, .ds = &Stats, .dv = DV_MOCK};
+static const daos_handle_t           Ih     = {.cookie = (uint64_t)VOS_ITER_MOCK};
+
+/** mocks */
+
+struct vos_iterator;
+struct dtx_handle;
+
+int
+dlck_obj_get_active(daos_handle_t coh, struct vos_iterator *iter, d_vector_t *dv)
+{
+	assert_int_equal(coh.cookie, Coh.cookie);
+	assert_ptr_equal(iter, VOS_ITER_MOCK);
+	assert_ptr_equal(dv, DV_MOCK);
+	return mock_type(int);
+}
+
+int
+dlck_irec_get_active(daos_handle_t coh, struct vos_iterator *iter, d_vector_t *dv)
+{
+	assert_int_equal(coh.cookie, Coh.cookie);
+	assert_ptr_equal(iter, VOS_ITER_MOCK);
+	assert_ptr_equal(dv, DV_MOCK);
+	return mock_type(int);
+}
+
+int
+dlck_sv_add_if_active(daos_handle_t coh, struct vos_iterator *iter, d_vector_t *dv)
+{
+	assert_int_equal(coh.cookie, Coh.cookie);
+	assert_ptr_equal(iter, VOS_ITER_MOCK);
+	assert_ptr_equal(dv, DV_MOCK);
+	return mock_type(int);
+}
+
+int
+dlck_ev_add_if_active(daos_handle_t coh, struct vos_iterator *iter, d_vector_t *dv)
+{
+	assert_int_equal(coh.cookie, Coh.cookie);
+	assert_ptr_equal(iter, VOS_ITER_MOCK);
+	assert_ptr_equal(dv, DV_MOCK);
+	return mock_type(int);
+}
+
+int
+vos_iterate(vos_iter_param_t *param, vos_iter_type_t type, bool recursive,
+	    struct vos_iter_anchors *anchors, vos_iter_cb_t pre_cb, vos_iter_cb_t post_cb,
+	    void *arg, struct dtx_handle *dth)
+{
+	struct dlck_iter_bundle *bundle = arg;
+
+	assert_ptr_not_equal(param, NULL);
+	assert_true(memcmp(param, &Param, sizeof(Param)) == 0);
+	assert_int_equal(type, VOS_ITER_OBJ);
+	assert_true(recursive);
+	assert_ptr_not_equal(anchors, NULL);
+	assert_true(memcmp(anchors, &Anchors_zeroed, sizeof(Anchors_zeroed)) == 0);
+	assert_ptr_equal(pre_cb, dlck_rec_get_active_cb);
+	assert_ptr_equal(post_cb, NULL);
+	assert_ptr_not_equal(bundle, NULL);
+	assert_true(memcmp(bundle, &Bundle, sizeof(Bundle)) == 0);
+	assert_ptr_equal(dth, NULL);
+
+	return mock_type(int);
+}
+
+/** tests */
+
+static void
+test_vos_iterate_fails(void **unused)
+{
+	int rc;
+
+	will_return(vos_iterate, GENERIC_ERROR_RC);
+	rc = dlck_vos_cont_recs_get_active(Coh, DV_MOCK, &Stats);
+	assert_int_equal(rc, GENERIC_ERROR_RC);
+}
+
+#define DLCK_REC_GET_ACTIVE_CB(RC, TYPE)                                                           \
+	(RC) =                                                                                     \
+	    dlck_rec_get_active_cb(Ih, ENTRY_MOCK, (TYPE), PARAM_MOCK, (void *)&Bundle, ACTS_MOCK)
+
+static void
+test_dlck_obj_get_active_fails(void **unused)
+{
+	int rc;
+
+	will_return(dlck_obj_get_active, GENERIC_ERROR_RC);
+	DLCK_REC_GET_ACTIVE_CB(rc, VOS_ITER_OBJ);
+	assert_int_equal(rc, GENERIC_ERROR_RC);
+}
+
+static void
+test_dlck_irec_get_active_AKEY_fails(void **unused)
+{
+	int rc;
+
+	will_return(dlck_irec_get_active, GENERIC_ERROR_RC);
+	DLCK_REC_GET_ACTIVE_CB(rc, VOS_ITER_AKEY);
+	assert_int_equal(rc, GENERIC_ERROR_RC);
+}
+
+static void
+test_dlck_irec_get_active_DKEY_fails(void **unused)
+{
+	int rc;
+
+	will_return(dlck_irec_get_active, GENERIC_ERROR_RC);
+	DLCK_REC_GET_ACTIVE_CB(rc, VOS_ITER_DKEY);
+	assert_int_equal(rc, GENERIC_ERROR_RC);
+}
+
+static void
+test_dlck_sv_add_if_active_fails(void **unused)
+{
+	int rc;
+
+	will_return(dlck_sv_add_if_active, GENERIC_ERROR_RC);
+	DLCK_REC_GET_ACTIVE_CB(rc, VOS_ITER_SINGLE);
+	assert_int_equal(rc, GENERIC_ERROR_RC);
+}
+
+static void
+test_dlck_ev_add_if_active_fails(void **unused)
+{
+	int rc;
+
+	will_return(dlck_ev_add_if_active, GENERIC_ERROR_RC);
+	DLCK_REC_GET_ACTIVE_CB(rc, VOS_ITER_RECX);
+	assert_int_equal(rc, GENERIC_ERROR_RC);
+}
+
+static const struct CMUnitTest tests_all[] = {
+    {"D100: vos_iterate() fails", test_vos_iterate_fails, NULL, NULL},
+    {"D101: dlck_obj_get_active() fails", test_dlck_obj_get_active_fails, NULL, NULL},
+    {"D102: dlck_irec_get_active() fails [AKEY]", test_dlck_irec_get_active_AKEY_fails, NULL, NULL},
+    {"D103: dlck_irec_get_active() fails [DKEY]", test_dlck_irec_get_active_DKEY_fails, NULL, NULL},
+    {"D104: dlck_sv_add_if_active() fails", test_dlck_sv_add_if_active_fails, NULL, NULL},
+    {"D105: dlck_ev_add_if_active() fails", test_dlck_ev_add_if_active_fails, NULL, NULL},
+};
+
+int
+main(int argc, char **argv)
+{
+	const char *test_name = "dlck_vos_cont_recs_get_active() tests";
+
+	return cmocka_run_group_tests_name(test_name, tests_all, NULL, NULL);
+}
diff --git a/src/utils/dlck/tests/vos_mocks.c b/src/utils/dlck/tests/vos_mocks.c
new file mode 100644
index 00000000000..a58eb97c7f6
--- /dev/null
+++ b/src/utils/dlck/tests/vos_mocks.c
@@ -0,0 +1,79 @@
+/**
+ * (C) Copyright 2025 Hewlett Packard Enterprise Development LP
+ *
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ */
+
+#define D_LOGFAC DD_FAC(tests)
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <setjmp.h>
+#include <cmocka.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <daos_srv/vos_types.h>
+
+#include "dlck_tests_common.h"
+
+/** mocks - just to make the module under test compile */
+
+struct vos_container;
+struct vos_cont_df;
+struct evt_desc_cbs;
+struct vos_pool;
+struct vos_object;
+uint32_t vos_agg_gap;
+
+struct vos_tls *
+vos_tls_get(bool standalone)
+{
+	assert_true(false);
+	return NULL;
+}
+
+void
+vos_lru_alloc_track(void *arg, daos_size_t size)
+{
+	assert_true(false);
+}
+
+void
+vos_lru_free_track(void *arg, daos_size_t size)
+{
+	assert_true(false);
+}
+
+int
+vos_dtx_act_reindex(struct vos_container *cont)
+{
+	assert_true(false);
+	return GENERIC_ERROR_RC;
+}
+
+void
+vos_obj_cache_evict(struct vos_container *cont)
+{
+	assert_true(false);
+}
+
+int
+vos_dtx_table_destroy(struct umem_instance *umm, struct vos_cont_df *cont_df)
+{
+	assert_true(false);
+	return GENERIC_ERROR_RC;
+}
+
+void
+vos_evt_desc_cbs_init(struct evt_desc_cbs *cbs, struct vos_pool *pool, daos_handle_t coh,
+		      struct vos_object *obj)
+{
+	assert_true(false);
+}
+
+void
+vos_dedup_invalidate(struct vos_pool *pool)
+{
+	assert_true(false);
+}
diff --git a/src/vos/vos_container.c b/src/vos/vos_container.c
index 25750b632b5..ebbb3320468 100644
--- a/src/vos/vos_container.c
+++ b/src/vos/vos_container.c
@@ -1030,13 +1030,7 @@ vos_cont_set_mod_bound(daos_handle_t coh, uint64_t epoch)
 	return 0;
 }
 
-struct dlck_iter_bundle {
-	daos_handle_t      coh;
-	d_vector_t        *dv;
-	struct dlck_stats *ds;
-};
-
-static int
+DLCK_STATIC int
 dlck_rec_get_active_cb(daos_handle_t ih, vos_iter_entry_t *entry, vos_iter_type_t type,
 		       vos_iter_param_t *param, void *cb_arg, unsigned int *acts)
 {