From 3a4f5a8a9cb56b302226edb5b02e4de86d31da6b Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Thu, 2 Sep 2021 08:32:19 +0200
Subject: [PATCH] :white_check_mark: add regression tests

---
 test/src/unit-regression2.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/test/src/unit-regression2.cpp b/test/src/unit-regression2.cpp
index 8d0175e9d..a42220e47 100644
--- a/test/src/unit-regression2.cpp
+++ b/test/src/unit-regression2.cpp
@@ -181,6 +181,13 @@ class sax_no_exception : public nlohmann::detail::json_sax_dom_parser<json>
 
 std::string* sax_no_exception::error_string = nullptr;
 
+/////////////////////////////////////////////////////////////////////
+// for #2982
+/////////////////////////////////////////////////////////////////////
+
+template<class T>
+class my_allocator : public std::allocator<T>
+{};
 
 TEST_CASE("regression tests 2")
 {
@@ -679,6 +686,15 @@ TEST_CASE("regression tests 2")
         test3[json::json_pointer(p)] = json::object();
         CHECK(test3.dump() == "{\"/root\":{}}");
     }
+
+    SECTION("issue #2982 - to_{binary format} does not provide a mechanism for specifying a custom allocator for the returned type")
+    {
+        std::vector<std::uint8_t, my_allocator<std::uint8_t>> my_vector;
+        json j = {1, 2, 3, 4};
+        json::to_cbor(j, my_vector);
+        json k = json::from_cbor(my_vector);
+        CHECK(j == k);
+    }
 }
 
 DOCTEST_CLANG_SUPPRESS_WARNING_POP