From f8217d240d598f39f70047f7a623dd46312542c6 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 4 Dec 2021 16:01:12 -0800
Subject: Initial commit.

---
 listpool/test/listpool_test.c | 166 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 listpool/test/listpool_test.c

(limited to 'listpool/test/listpool_test.c')

diff --git a/listpool/test/listpool_test.c b/listpool/test/listpool_test.c
new file mode 100644
index 0000000..cb54d00
--- /dev/null
+++ b/listpool/test/listpool_test.c
@@ -0,0 +1,166 @@
+#include "listpool.h"
+
+#include "test.h"
+
+#define NUM_BLOCKS 10
+
+DEF_LISTPOOL(test_pool, int, NUM_BLOCKS);
+
+static int count(test_pool* pool) {
+  int count = 0;
+  listpool_foreach(pool, n, { count++; });
+  return count;
+}
+
+static int sum(test_pool* pool) {
+  int sum = 0;
+  listpool_foreach(pool, n, { sum += *n; });
+  return sum;
+}
+
+// Create a pool.
+TEST_CASE(listpool_create) {
+  test_pool pool;
+  listpool_make(&pool);
+}
+
+// Allocate all N blocks.
+TEST_CASE(listpool_fully_allocate) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  for (int i = 0; i < NUM_BLOCKS; ++i) {
+    const int* block = listpool_alloc(&pool);
+    TEST_TRUE(block != 0);
+  }
+}
+
+// Allocate all N blocks, then free them.
+TEST_CASE(listpool_fill_then_free) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  int* blocks[NUM_BLOCKS] = {0};
+  for (int i = 0; i < NUM_BLOCKS; i++) {
+    blocks[i] = listpool_alloc(&pool);
+    TEST_TRUE(blocks[i] != 0);
+  }
+
+  for (int i = 0; i < NUM_BLOCKS; i++) {
+    listpool_free(&pool, &blocks[i]);
+    TEST_EQUAL(blocks[i], 0); // Pointer should be set to 0 on free.
+  }
+
+  TEST_EQUAL(count(&pool), 0);
+}
+
+// Attempt to allocate blocks past the maximum pool size.
+// The pool should handle the failed allocations gracefully.
+TEST_CASE(listpool_allocate_beyond_max_size) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  // Fully allocate the pool.
+  for (int i = 0; i < NUM_BLOCKS; ++i) {
+    TEST_TRUE(listpool_alloc(&pool) != 0);
+  }
+
+  // Past the end.
+  for (int i = 0; i < NUM_BLOCKS; ++i) {
+    TEST_EQUAL(listpool_alloc(&pool), 0);
+  }
+}
+
+// Free blocks should always remain zeroed out.
+// This tests the invariant right after creating the pool.
+TEST_CASE(listpool_zero_free_blocks_after_creation) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  const int zero = 0;
+  for (int i = 0; i < NUM_BLOCKS; ++i) {
+    const int* block = (const int*)(pool.blocks) + i;
+    TEST_EQUAL(memcmp(block, &zero, sizeof(int)), 0);
+  }
+}
+
+// Free blocks should always remain zeroed out.
+// This tests the invariant after freeing a block.
+TEST_CASE(listpool_zero_free_block_after_free) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  int* val = listpool_alloc(&pool);
+  TEST_TRUE(val != 0);
+  *val = 177;
+
+  int* old_val = val;
+  listpool_free(&pool, &val); // val pointer is set to 0.
+  TEST_EQUAL(*old_val, 0);    // Block is zeroed out after free.
+}
+
+// Traverse an empty pool.
+TEST_CASE(listpool_traverse_empty) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  TEST_EQUAL(count(&pool), 0);
+}
+
+// Traverse a partially full pool.
+TEST_CASE(listpool_traverse_partially_full) {
+  const int N = NUM_BLOCKS / 2;
+
+  test_pool pool;
+  listpool_make(&pool);
+
+  for (int i = 0; i < N; ++i) {
+    int* val = listpool_alloc(&pool);
+    TEST_TRUE(val != 0);
+    *val = i + 1;
+  }
+
+  TEST_EQUAL(sum(&pool), (N) * (N + 1) / 2);
+}
+
+// Traverse a full pool.
+TEST_CASE(listpool_traverse_full) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  for (int i = 0; i < NUM_BLOCKS; ++i) {
+    int* val = listpool_alloc(&pool);
+    TEST_TRUE(val != 0);
+    *val = i + 1;
+  }
+
+  TEST_EQUAL(sum(&pool), (NUM_BLOCKS) * (NUM_BLOCKS + 1) / 2);
+}
+
+// Remove a value from the list.
+TEST_CASE(listpool_remove_value) {
+  test_pool pool;
+  listpool_make(&pool);
+
+  int* x = listpool_alloc(&pool);
+  int* y = listpool_alloc(&pool);
+  TEST_TRUE(x != 0);
+  TEST_TRUE(y != 0);
+
+  *x = 155;
+  *y = 177;
+
+  listpool_remove(&pool, 155); // x
+
+  TEST_EQUAL(count(&pool), 1);
+  TEST_EQUAL(sum(&pool), *y);
+}
+
+// Stress test.
+//
+// 1. Allocate the pool, either fully or partially. If fully, attempt to
+//    allocate some items past the end.
+//
+// 2. Free all allocated items in some random order.
+
+int main() { return 0; }
-- 
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