added first unit test

tests/list.c

@@ -0,0 +1,48 @@
+#include <stdint.h>
+#include <criterion/criterion.h>
+
+#include "list.h"
+
+static int compare(const void *a, const void *b) {
+	return b - a;
+}
+
+Test(test, basics)
+{
+	intptr_t i;
+	struct list l;
+	
+	list_init(&l);
+	
+	for (i = 0; i < 100; i++) {
+		cr_assert_eq(list_length(&l), i);
+		
+		list_push(&l, (void *) i);
+	}
+
+	cr_assert_eq(list_at(&l, 555), NULL);
+	cr_assert_eq(list_last(&l), (void *) 99);
+	cr_assert_eq(list_first(&l), NULL);
+
+	i = 0;
+	list_foreach (void *j, &l)
+		cr_assert_eq(j, (void *) i++);
+	
+	list_sort(&l, compare); /* Reverse list */
+	
+	i = 99;
+	list_foreach (void *j, &l) {
+		cr_assert_eq(j, (void *) i, "Is %p, expected %p", i, j);
+		i--;
+	}
+
+	cr_assert(list_contains(&l, (void *) 55));
+	
+	list_remove(&l, (void *) 55);
+	
+	cr_assert(!list_contains(&l, (void *) 55));
+
+	list_destroy(&l, NULL, false);
+
+	cr_assert_eq(list_length(&l), -1, "List not properly destroyed: l.length = %zd", l.length);
+}