diff -r 2e6e9d9f2159 -r c9d008861178 tests/test_compare.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_compare.cpp	Wed Feb 08 20:26:26 2023 +0100
@@ -0,0 +1,127 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2022 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/compare.h"
+
+#include <gtest/gtest.h>
+
+template<typename T>
+static void test_compare(
+        int (*fnc)(
+                void const *,
+                void const *
+        )
+) {
+    auto m = std::numeric_limits<T>::max() / 400;
+    T x, y;
+
+    x = (std::is_signed_v<T> ? -3 : 3) * m;
+    y = 5 * m;
+    EXPECT_LT(fnc(&x, &y), 0);
+    EXPECT_GT(fnc(&y, &x), 0);
+
+    x = 120 * m;
+    y = 348 * m;
+    EXPECT_LT(fnc(&x, &y), 0);
+    EXPECT_GT(fnc(&y, &x), 0);
+
+    if constexpr (std::is_signed_v<T>) {
+        x = -120 * m;
+        y = -348 * m;
+        EXPECT_GT(fnc(&x, &y), 0);
+        EXPECT_LT(fnc(&y, &x), 0);
+    }
+
+    x = y;
+    EXPECT_EQ(fnc(&x, &y), 0);
+    EXPECT_EQ(fnc(&y, &x), 0);
+}
+
+TEST(Compare, Int) {
+    test_compare<int>(cx_cmp_int);
+}
+
+TEST(Compare, Longint) {
+    test_compare<long int>(cx_cmp_longint);
+}
+
+TEST(Compare, Longlong) {
+    test_compare<long long>(cx_cmp_longlong);
+}
+
+TEST(Compare, Int16) {
+    test_compare<int16_t>(cx_cmp_int16);
+}
+
+TEST(Compare, Int32) {
+    test_compare<int32_t>(cx_cmp_int32);
+}
+
+TEST(Compare, Int64) {
+    test_compare<int64_t>(cx_cmp_int64);
+}
+
+TEST(Compare, Uint) {
+    test_compare<unsigned int>(cx_cmp_uint);
+}
+
+TEST(Compare, Ulongint) {
+    test_compare<unsigned long int>(cx_cmp_ulongint);
+}
+
+TEST(Compare, Ulonglong) {
+    test_compare<unsigned long long>(cx_cmp_ulonglong);
+}
+
+TEST(Compare, Uint16) {
+    test_compare<uint16_t>(cx_cmp_uint16);
+}
+
+TEST(Compare, Uint32) {
+    test_compare<uint32_t>(cx_cmp_uint32);
+}
+
+TEST(Compare, Uint64) {
+    test_compare<uint64_t>(cx_cmp_uint64);
+}
+
+TEST(Compare, Float) {
+    test_compare<float>(cx_cmp_float);
+}
+
+TEST(Compare, Double) {
+    test_compare<double>(cx_cmp_double);
+}
+
+TEST(Compare, IntPtr) {
+    test_compare<intptr_t>(cx_cmp_intptr);
+}
+
+TEST(Compare, UintPtr) {
+    test_compare<uintptr_t>(cx_cmp_uintptr);
+}