From ba8174041e66038c4c02814ecbf2f8e062f2291c Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Mon, 6 Jul 2020 12:52:48 +0200
Subject: [PATCH] :white_check_mark: add test case for JSON_ASSERT

---
 test/CMakeLists.txt            |  1 +
 test/src/unit-assert_macro.cpp | 50 ++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 test/src/unit-assert_macro.cpp

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8434f78d7..43af37d58 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -95,6 +95,7 @@ set(files
     src/unit-algorithms.cpp
     src/unit-allocator.cpp
     src/unit-alt-string.cpp
+    src/unit-assert_macro.cpp
     src/unit-bson.cpp
     src/unit-capacity.cpp
     src/unit-cbor.cpp
diff --git a/test/src/unit-assert_macro.cpp b/test/src/unit-assert_macro.cpp
new file mode 100644
index 000000000..009a2b0b4
--- /dev/null
+++ b/test/src/unit-assert_macro.cpp
@@ -0,0 +1,50 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.8.0
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+/// global variable to record side effect of assert calls
+int assert_counter = 0;
+
+/// set failure variable to true instead of calling assert(x)
+#define JSON_ASSERT(x) if (!(x)) ++assert_counter;
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("JSON_ASSERT(x)")
+{
+  const json j = {{"bar", 1}};
+  CHECK(assert_counter == 0);
+
+  // accessing non-exising key in const value would assert
+  j["foo"] == 1;
+
+  CHECK(assert_counter == 1);
+}
\ No newline at end of file