diff --git a/test/test_object.c b/test/test_object.c
index 2a1d7e0..53afdc0 100644
--- a/test/test_object.c
+++ b/test/test_object.c
@@ -5,18 +5,49 @@
  * Eryn Wells <eryn@erynwells.me>
  */
 
+#include <stdlib.h>
+
 #include <check.h>
+
 #include "object.h"
 #include "test_suites.h"
 
 
+void check_sphere_intersection(Object *sphere, Ray ray, int expected_nints);
+
+
 START_TEST(test_sphere_does_intersect)
 {
+    // Create a sphere at the origin of radius 1.
+    Object *sphere = object_init(ObjectTypeSphere);
+    object_sphere_set_radius(sphere, 1.0);
 
+    Vector3 loc, dir;
+    Ray ray;
+
+    loc = vector_init(0, 0, -5);
+    dir = vector_init(0, 0, 1);
+    ray = ray_init(loc, dir);
+    check_sphere_intersection(sphere, ray, 2);
+
+    loc = vector_init(0, -5, 0);
+    dir = vector_init(
 }
 END_TEST
 
 
+void
+check_sphere_intersection(Object *sphere, Ray ray, int expected_nints)
+{
+    float *t;
+    int nints = object_does_intersect(sphere, ray, &t);
+    ck_assert(nints == expected_nints);
+    if (nints > 0) {
+        free(t);
+    }
+}
+
+
 Suite *
 test_object_create_suite()
 {