diff --git a/source/ftl/map.c b/source/ftl/map.c
index 18bbb70..18f0731 100644
--- a/source/ftl/map.c
+++ b/source/ftl/map.c
@@ -353,7 +353,7 @@ int find_root(struct ftl_map *map, uint32_t group)
  * within the page group, the first user page of the next page group should be
  * used as that page group should not be in use.
  */
-static int find_head(struct ftl_map *map)
+int find_head(struct ftl_map *map)
 {
 	size_t log2_pages_per_block = map->log2_pages_per_group +
 		map->log2_groups_per_block;
diff --git a/source/tests/Makefile b/source/tests/Makefile
index 7be1e45..9e5561c 100644
--- a/source/tests/Makefile
+++ b/source/tests/Makefile
@@ -4,6 +4,7 @@ test-obj-y += source/tests/ftl/find_block.o
 test-obj-y += source/tests/ftl/find_block_div.o
 test-obj-y += source/tests/ftl/find_last_block.o
 test-obj-y += source/tests/ftl/find_last_group.o
+test-obj-y += source/tests/ftl/find_head.o
 test-obj-y += source/tests/ftl/find_root.o
 test-obj-y += source/tests/ftl/next_upage.o
 test-obj-y += source/tests/ftl/read_page_group.o
diff --git a/source/tests/ftl/find_head.c b/source/tests/ftl/find_head.c
new file mode 100644
index 0000000..722a4f1
--- /dev/null
+++ b/source/tests/ftl/find_head.c
@@ -0,0 +1,104 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>
+
+#include <cmocka.h>
+
+#include <bitops.h>
+#include <flash.h>
+#include <ftl.h>
+#include <macros.h>
+
+int find_head(struct ftl_map *map);
+
+static void test_erased(void **state)
+{
+	struct ftl_map map;
+	int ret;
+
+	(void)state;
+
+	map.log2_pages_per_group = ilog2(16);
+	map.log2_groups_per_block = ilog2(1);
+	map.nblocks = 4;
+	map.root = 4;
+
+	expect_value(__wrap_flash_is_erased, addr, 5);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 1);
+
+	ret = find_head(&map);
+
+	assert_int_equal(ret, 0);
+	assert_int_equal(map.head, 5);
+}
+
+static void test_end_of_block(void **state)
+{
+	struct ftl_map map;
+	int ret;
+
+	(void)state;
+
+	map.log2_pages_per_group = ilog2(16);
+	map.log2_groups_per_block = ilog2(1);
+	map.nblocks = 4;
+	map.root = 4;
+
+	expect_value(__wrap_flash_is_erased, addr, 5);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 6);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 7);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 8);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 9);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 10);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 11);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 12);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 13);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	expect_value(__wrap_flash_is_erased, addr, 14);
+	expect_value(__wrap_flash_is_erased, len, 1);
+	will_return(__wrap_flash_is_erased, 0);
+
+	ret = find_head(&map);
+
+	assert_int_equal(ret, 0);
+	assert_int_equal(map.head, 16);
+}
+
+int test_find_head(void)
+{
+	const struct CMUnitTest tests[] = {
+		{ "find_head: erased", test_erased, NULL, NULL, NULL },
+		{ "find_head: end of block", test_end_of_block, NULL, NULL, NULL },
+	};
+
+	return cmocka_run_group_tests_name("find_head", tests, NULL, NULL);
+}
diff --git a/source/tests/main.c b/source/tests/main.c
index 9dc4fa7..6c660e7 100644
--- a/source/tests/main.c
+++ b/source/tests/main.c
@@ -71,6 +71,7 @@ int test_find_block(void);
 int test_find_block_div(void);
 int test_find_last_block(void);
 int test_find_last_group(void);
+int test_find_head(void);
 int test_find_root(void);
 int test_next_upage(void);
 int test_read_page_group(void);
@@ -86,6 +87,7 @@ int main(void)
 	count += test_find_block_div();
 	count += test_find_last_block();
 	count += test_find_last_group();
+	count += test_find_head();
 	count += test_find_root();
 	count += test_next_upage();
 	count += test_read_page_group();