diff -r 7edce1b5a798 -r f83583a0bbac test/test_basic_mempool.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/test_basic_mempool.cpp	Wed Aug 03 17:27:55 2022 +0200
@@ -0,0 +1,162 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cx/basic_mempool.h"
+#include "util_allocator.h"
+#include <gtest/gtest.h>
+
+class CxBasicMempool : public ::testing::Test {
+protected:
+    CxTestingAllocator testingAllocator;
+    CxMempool *pool = nullptr;
+
+    void TearDown() override {
+        if (pool != nullptr) {
+            cxMempoolDestroy(pool);
+        }
+        EXPECT_TRUE(testingAllocator.verify());
+    }
+};
+
+TEST_F(CxBasicMempool, Create) {
+    pool = cxBasicMempoolCreateSimple(16);
+    ASSERT_NE(pool->allocator, nullptr);
+    ASSERT_NE(pool->cl, nullptr);
+    EXPECT_NE(pool->cl->destroy, nullptr);
+    ASSERT_NE(pool->allocator->cl, nullptr);
+    EXPECT_EQ(pool->allocator->data, pool);
+    EXPECT_NE(pool->allocator->cl->malloc, nullptr);
+    EXPECT_NE(pool->allocator->cl->calloc, nullptr);
+    EXPECT_NE(pool->allocator->cl->realloc, nullptr);
+    EXPECT_NE(pool->allocator->cl->free, nullptr);
+
+    auto basic_pool = reinterpret_cast<cx_basic_mempool_s *>(pool);
+    EXPECT_EQ(basic_pool->allocator, cxDefaultAllocator);
+    EXPECT_EQ(basic_pool->size, 16);
+    EXPECT_EQ(basic_pool->ndata, 0);
+    EXPECT_NE(basic_pool->data, nullptr);
+}
+
+TEST_F(CxBasicMempool, malloc) {
+    pool = cxBasicMempoolCreate(4, &testingAllocator);
+    auto basic_pool = reinterpret_cast<cx_basic_mempool_s *>(pool);
+    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
+    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
+    EXPECT_EQ(testingAllocator.alloc_total, 2);
+    EXPECT_EQ(basic_pool->ndata, 2);
+    EXPECT_EQ(basic_pool->size, 4);
+    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
+    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
+    EXPECT_EQ(testingAllocator.alloc_total, 4);
+    EXPECT_EQ(basic_pool->ndata, 4);
+    EXPECT_EQ(basic_pool->size, 4);
+    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
+    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
+    EXPECT_EQ(testingAllocator.alloc_total, 6);
+    EXPECT_EQ(basic_pool->ndata, 6);
+    EXPECT_GE(basic_pool->size, 6);
+    EXPECT_TRUE(testingAllocator.used());
+}
+
+TEST_F(CxBasicMempool, calloc) {
+    pool = cxBasicMempoolCreate(4, &testingAllocator);
+
+    auto test = (int *) cxCalloc(pool->allocator, 2, sizeof(int));
+    ASSERT_NE(test, nullptr);
+    EXPECT_EQ(test[0], 0);
+    EXPECT_EQ(test[1], 0);
+    EXPECT_TRUE(testingAllocator.used());
+}
+
+static unsigned test_destructor_called = 0;
+
+static void test_destructor([[maybe_unused]] void *mem) {
+    test_destructor_called++;
+}
+
+TEST_F(CxBasicMempool, destructor) {
+    pool = cxBasicMempoolCreate(4, &testingAllocator);
+    auto data = cxMalloc(pool->allocator, sizeof(int));
+    *((int *) data) = 13;
+    cxMempoolSetDestructor(pool, data, test_destructor);
+    EXPECT_EQ(*((int *) data), 13);
+    test_destructor_called = 0;
+    cxFree(pool->allocator, data);
+    EXPECT_EQ(test_destructor_called, 1);
+    data = cxMalloc(pool->allocator, sizeof(int));
+    cxMempoolSetDestructor(pool, data, test_destructor);
+    cxMempoolDestroy(pool);
+    pool = nullptr;
+    EXPECT_EQ(test_destructor_called, 2);
+}
+
+TEST_F(CxBasicMempool, realloc) {
+    pool = cxBasicMempoolCreate(4, &testingAllocator);
+    auto data = cxMalloc(pool->allocator, sizeof(int));
+    *((int *) data) = 13;
+    cxMempoolSetDestructor(pool, data, test_destructor);
+
+    void *rdata = data;
+    unsigned n = 1;
+    while (rdata == data) {
+        n <<= 1;
+        ASSERT_LT(n, 65536); // eventually the memory should be moved elsewhere
+        rdata = cxRealloc(pool->allocator, data, n * sizeof(intptr_t));
+    }
+
+    EXPECT_EQ(*((int *) rdata), 13);
+    // test if destructor is still intact
+    test_destructor_called = 0;
+    cxFree(pool->allocator, rdata);
+    EXPECT_EQ(test_destructor_called, 1);
+}
+
+
+TEST_F(CxBasicMempool, free) {
+    pool = cxBasicMempoolCreate(4, &testingAllocator);
+    auto basic_pool = reinterpret_cast<cx_basic_mempool_s *>(pool);
+
+    void *mem1;
+    void *mem2;
+
+    mem1 = cxMalloc(pool->allocator, 16);
+    cxFree(pool->allocator, mem1);
+    EXPECT_EQ(basic_pool->ndata, 0);
+
+    cxMalloc(pool->allocator, 16);
+    cxMalloc(pool->allocator, 16);
+    mem1 = cxMalloc(pool->allocator, 16);
+    cxMalloc(pool->allocator, 16);
+    mem2 = cxMalloc(pool->allocator, 16);
+
+    EXPECT_EQ(basic_pool->ndata, 5);
+    cxFree(pool->allocator, mem1);
+    EXPECT_EQ(basic_pool->ndata, 4);
+    cxFree(pool->allocator, mem2);
+    EXPECT_EQ(basic_pool->ndata, 3);
+}
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