Added an interface to access free list and updated tests to use it

3 files changed, 17 insertions, 2 deletions

diff --git a/include/alloc.h b/include/alloc.h
index cdbdb37..82a4b7b 100644
--- a/include/alloc.h
+++ b/include/alloc.h
@@ -35,4 +35,11 @@ void *allocate(size_t);
  */
 void release(void *);
 
+/*
+ * Return a pointer to the head of the free list. I can't recall
+ * precisely what I wanted this function called in the assignment,
+ * so this name may change when I get the chance to check.
+ */
+free_nd *free_list_head();
+
 #endif
diff --git a/src/alloc.c b/src/alloc.c
index 2f4aa03..dd1c8aa 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -83,3 +83,7 @@ void release(void *ptr) {
   fl_add_node(&free_list, ptr);
   fl_coalesce_nodes(free_list);
 }
+
+free_nd *free_list_head() {
+  return free_list;
+}
diff --git a/tests/liballoc_tests.c b/tests/liballoc_tests.c
index ad9635f..cfd976a 100644
--- a/tests/liballoc_tests.c
+++ b/tests/liballoc_tests.c
@@ -51,7 +51,11 @@ START_TEST(basic_release) {
 
   release(memory);
 
-  // TODO: verify entry on the free list
+  free_nd *list_head = free_list_head();
+  ck_assert_ptr_nonnull(list_head);
+  ck_assert_ptr_eq(list_head, memory);
+  ck_assert_int_eq(list_head->size, ALIGNMENT*3);
+  ck_assert_ptr_null(list_head->next);
 }
 END_TEST
 
@@ -59,7 +63,7 @@ START_TEST(release_null) {
   /* releasing NULL should take no action */
   release(NULL);
 
-  // TODO: verify no entry on free list
+  ck_assert_ptr_null(free_list_head());
 }
 END_TEST