tests/test_allocator.cpp

/*
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 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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#include "cx/allocator.h"
#include <gtest/gtest.h>

TEST(Allocator, DefaultAllocator) {
    cx_allocator_class *clazz = cxDefaultAllocator->cl;
    ASSERT_NE(clazz, nullptr);
}

TEST(Allocator, DefaultMalloc) {
    void *test = cxMalloc(cxDefaultAllocator, 16);
    ASSERT_NE(test, nullptr);
    free(test);
}

TEST(Allocator, DefaultRealloc) {
    void *test = calloc(8, 1);
    memcpy(test, "Test", 5);
    test = cxRealloc(cxDefaultAllocator, test, 16);
    ASSERT_NE(test, nullptr);
    EXPECT_STREQ(reinterpret_cast<char *>(test), "Test");
    free(test);
}

TEST(Allocator, Reallocate) {
    void *test = calloc(8, 1);
    memcpy(test, "Test", 5);
    int ret = cxReallocate(cxDefaultAllocator, &test, 16);
    EXPECT_EQ(ret, 0);
    ASSERT_NE(test, nullptr);
    EXPECT_STREQ(reinterpret_cast<char *>(test), "Test");
    free(test);
}

TEST(Allocator, DefaultCalloc) {
    char *test = reinterpret_cast<char *>(cxCalloc(cxDefaultAllocator, 8, 2));
    ASSERT_NE(test, nullptr);
    for (int i = 0; i < 16; i++) ASSERT_EQ(test[i], 0);
    free(test);
}

TEST(Allocator, DefaultFree) {
    void *test = malloc(16);
    EXPECT_NO_FATAL_FAILURE(
            cxFree(cxDefaultAllocator, test);
    );
}

TEST(Allocator, FailingReallocate) {
    // Mock an allocator that always returns nullptr on realloc
    cx_allocator_class mock_cl;
    mock_cl.realloc = [](
            [[maybe_unused]]void *p,
            [[maybe_unused]]void *d,
            [[maybe_unused]]size_t n
    ) -> void * { return nullptr; };
    cx_allocator_s mock{&mock_cl, nullptr};

    void *test = calloc(8, 1);
    memcpy(test, "Test", 5);
    void *original = test;
    int ret = cxReallocate(&mock, &test, 16);
    // non-zero return code because of the failure
    EXPECT_NE(ret, 0);
    // the test pointer was not changed and still points to the same memory
    EXPECT_EQ(test, original);
    EXPECT_STREQ(reinterpret_cast<char *>(test), "Test");
    free(test);
}