diff --git a/source/tests/ftl/trace_path.c b/source/tests/ftl/trace_path.c
index 4c470d2..f0ce27c 100644
--- a/source/tests/ftl/trace_path.c
+++ b/source/tests/ftl/trace_path.c
@@ -46,6 +46,7 @@ static void test_trace1(void **state)
 			.va = 0xb,
 			.subtrees = {
 				[0] = UINT32_MAX,
+				[28] = 42,
 				[29] = 44,
 				[30] = UINT32_MAX,
 			},
@@ -54,6 +55,7 @@ static void test_trace1(void **state)
 			.va = 0xd,
 			.subtrees = {
 				[0] = UINT32_MAX,
+				[29] = 43,
 				[30] = 45,
 				[31] = UINT32_MAX,
 			},
@@ -62,6 +64,7 @@ static void test_trace1(void **state)
 			.va = 0xe,
 			.subtrees = {
 				[0] = UINT32_MAX,
+				[30] = 44,
 				[31] = 46,
 			},
 		},
@@ -72,6 +75,7 @@ static void test_trace1(void **state)
 			},
 		},
 	};
+	struct ftl_page_desc ret_page_desc;
 	struct ftl_map map;
 	uint32_t page;
 	int ret;
@@ -107,10 +111,16 @@ static void test_trace1(void **state)
 	will_return(__wrap_read_page_desc, descs + 3);
 	will_return(__wrap_read_page_desc, 0);
 
-	ret = __real_trace_path(&map, NULL, &page, 0xf);
+	ret = __real_trace_path(&map, &ret_page_desc, &page, 0xf);
 
 	assert_int_equal(ret, 0);
 	assert_int_equal(page, 46);
+
+	assert_int_equal(ret_page_desc.va, 0xf);
+	assert_int_equal(ret_page_desc.subtrees[28], 42);
+	assert_int_equal(ret_page_desc.subtrees[29], 43);
+	assert_int_equal(ret_page_desc.subtrees[30], 44);
+	assert_int_equal(ret_page_desc.subtrees[31], 45);
 }
 
 int test_trace_path(void)