diff --git a/src/main.c b/src/main.c
index 9871cba..83588f7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,6 +5,7 @@
 #include "ht.h"
 #include "ll.h"
 #include "vec.h"
+#include "sprs.h"
 
 int _test_vec_foreach_func(void* data, va_list args) {
   char* real_data = data;
@@ -252,6 +253,82 @@ int test_ll_poptail(){
     return return_code;
 }
 
+int _test_sprs_foreach_count(void* data, va_list args){
+  (*(va_arg(args, int*)))++;
+  return 0;
+}
+
+int test_sprs_basic(){
+  sprs sprs;
+  sprs_init(&sprs);
+  sprs_setup(&sprs, 1);
+  sprs_free(&sprs);
+  return 1;
+}
+
+int test_sprs_put(){
+  int return_code;
+  sprs sprs;
+  sprs_init(&sprs);
+  sprs_setup(&sprs, 4);
+  sprs_put(&sprs, 2, NULL);
+  return_code = sprs.dense[0] == 2 && sprs.sparse[2].index == 0 && sprs.sparse[2].data == NULL;
+  sprs_free(&sprs);
+  return return_code;
+}
+
+int test_sprs_contains(){
+  int return_code;
+  sprs sprs;
+  sprs_init(&sprs);
+  sprs_setup(&sprs, 4);
+  sprs_put(&sprs, 2, NULL);
+  sprs_put(&sprs, 3, NULL);
+  return_code = (sprs_contains(&sprs, 2) == 1) && (sprs_contains(&sprs, 3) == 1) && (sprs_contains(&sprs, 0) == 0);
+  sprs_free(&sprs);
+  return return_code;
+}
+
+int test_sprs_get(){
+  int return_code;
+  sprs sprs;
+  char* test_string = "test";
+  sprs_init(&sprs);
+  sprs_setup(&sprs, 4);
+  sprs_put(&sprs, 2, test_string);
+  sprs_put(&sprs, 3, NULL);
+  return_code = sprs_get(&sprs, 2) == test_string && sprs_get(&sprs, 3) == NULL && sprs_get(&sprs, 0) == NULL;
+  sprs_free(&sprs);
+  return return_code;
+}
+
+int test_sprs_find(){
+  int return_code;
+  sprs sprs;
+  char* test_string = "test";
+  sprs_init(&sprs);
+  sprs_setup(&sprs, 4);
+  sprs_put(&sprs, 3, test_string);
+  return_code = sprs_find(&sprs, test_string, compare_pointer) == test_string;
+  sprs_free(&sprs);
+  return return_code;
+}
+
+int test_sprs_foreach(){
+  int return_code;
+  sprs sprs;
+  int count = 0;
+  sprs_init(&sprs);
+  sprs_setup(&sprs, 4);
+  sprs_put(&sprs, 0, NULL);
+  sprs_put(&sprs, 2, NULL);
+  sprs_put(&sprs, 3, NULL);
+  sprs_foreach(&sprs, NULL, compare_always, _test_sprs_foreach_count, &count);
+  return_code = count == 3;
+  sprs_free(&sprs);
+  return return_code;
+}
+
 int run_test(char* test_name, int (*test_func)()) {
   int success = test_func();
   printf("Running test %-15s . . . ", test_name);
@@ -260,18 +337,18 @@ int run_test(char* test_name, int (*test_func)()) {
 }
 
 int main(int argc, char** argv) {
-  char* test_names[19] = {"vec_basic",   "vec_add",   "vec_remove", "vec_find",
+  char* test_names[25] = {"vec_basic",   "vec_add",   "vec_remove", "vec_find",
                           "vec_foreach", "vec_index", "ht_basic",   "ht_put",
-                          "ht_get",      "ht_remove", "ht_foreach", "ll_basic", "ll_append", "ll_prepend", "ll_remove", "ll_find" , "ll_foreach", "ll_pophead", "ll_poptail"};
+                          "ht_get",      "ht_remove", "ht_foreach", "ll_basic", "ll_append", "ll_prepend", "ll_remove", "ll_find" , "ll_foreach", "ll_pophead", "ll_poptail", "sprs_basic", "sprs_put", "sprs_contains", "sprs_get", "sprs_find", "sprs_foreach"};
 
-  int (*test_functions[19])() = {
+  int (*test_functions[25])() = {
       test_vec_basic,   test_vec_add,   test_vec_remove, test_vec_find,
       test_vec_foreach, test_vec_index, test_ht_basic,   test_ht_put,
-      test_ht_get,      test_ht_remove, test_ht_foreach, test_ll_basic, test_ll_append, test_ll_prepend, test_ll_remove, test_ll_find, test_ll_foreach, test_ll_pophead, test_ll_poptail};
+      test_ht_get,      test_ht_remove, test_ht_foreach, test_ll_basic, test_ll_append, test_ll_prepend, test_ll_remove, test_ll_find, test_ll_foreach, test_ll_pophead, test_ll_poptail, test_sprs_basic, test_sprs_put, test_sprs_contains, test_sprs_get, test_sprs_find, test_sprs_foreach};
 
   int test_index = 0;
   int result = 1;
-  for (; test_index < 19 && result; test_index++) {
+  for (; test_index < 25 && result; test_index++) {
     result = run_test(test_names[test_index], test_functions[test_index]);
   }
   return result ? EXIT_SUCCESS : EXIT_FAILURE;