Add memory pool test, fix bugs

tests/pool/pool_test.c

@@ -0,0 +1,87 @@
+#include "pool.h"
+#include "test_structures.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+int get_random(int low, int high)
+{
+    srand(time(NULL));
+    int n = low + rand() % (high - low + 1);
+    return n;
+}
+
+bool test_fill(ChunkOfData* myPtrs[], int check_size)
+{
+    int itr = 0;
+
+    ChunkOfData* test_chunk = NULL;
+    do
+    {
+        test_chunk = POOL_GET(ChunkOfData);
+        if(test_chunk != NULL) myPtrs[itr++] = test_chunk;
+    } while(test_chunk != NULL);
+
+    if(itr != check_size)
+    {
+        fprintf(stderr, "Error: failed to get expected number of valid pointers\n"
+                        "    expected: %d, actual %d\n", check_size, itr);
+        return false;
+    }
+
+    return true;
+}
+
+bool test_fill_and_empty(void)
+{
+    ChunkOfData* myPtrs[TEST_SIZE];
+    if(!test_fill(myPtrs, TEST_SIZE)) return false;
+
+    for(int itr = TEST_SIZE; itr >= 0; --itr)
+    {
+        POOL_FREE(ChunkOfData, myPtrs[itr]);
+    }
+
+    return true;
+}
+
+bool test_fill_and_remove_at_random_and_refill_and_empty(void)
+{
+    ChunkOfData* myPtrs[TEST_SIZE];
+    if(!test_fill(myPtrs, TEST_SIZE)) return false;
+
+    // remove between 10 and TEST_SIZE 
+    int number_to_remove = get_random(100, TEST_SIZE);
+
+    for(int itr = 0; itr < number_to_remove; itr++)
+    {
+        POOL_FREE(ChunkOfData, myPtrs[itr]);
+    }
+
+    if(!test_fill(myPtrs, number_to_remove)) return false;
+
+    for(int itr = 0; itr < TEST_SIZE; itr++)
+    {
+        POOL_FREE(ChunkOfData, myPtrs[itr]);
+    }
+
+    return true;
+}
+
+int main(void)
+{
+    // Test it twice to make sure empty works, kinda hacky.
+    if(!test_fill_and_empty()) return -1;
+    if(!test_fill_and_empty()) return -1;
+
+    // Similarly here, verify that fill, random num removal, refill, and empty
+    // by refilling and emptying again
+    if(!test_fill_and_remove_at_random_and_refill_and_empty()) return -1;
+    if(!test_fill_and_empty()) return -1;
+
+    printf("Pool Tests Passed\n");
+
+    return 0;
+}