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diff --git a/third_party/immer/test/array_transient/gc.cpp b/third_party/immer/test/array_transient/gc.cpp
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+++ b/third_party/immer/test/array_transient/gc.cpp
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+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <immer/array.hpp>
+#include <immer/array_transient.hpp>
+
+#include <immer/heap/gc_heap.hpp>
+#include <immer/refcount/no_refcount_policy.hpp>
+
+using gc_memory = immer::memory_policy<immer::heap_policy<immer::gc_heap>,
+                                       immer::no_refcount_policy,
+                                       immer::gc_transience_policy,
+                                       false>;
+
+template <typename T>
+using test_array_t = immer::array<T, gc_memory>;
+
+template <typename T>
+using test_array_transient_t = immer::array_transient<T, gc_memory>;
+
+#define VECTOR_T test_array_t
+#define VECTOR_TRANSIENT_T test_array_transient_t
+
+#include "../vector_transient/generic.ipp"
+
+TEST_CASE("array provides mutable data")
+{
+    auto arr = immer::array<int, gc_memory>(10, 0);
+    CHECK(arr.size() == 10);
+    auto tr = arr.transient();
+    CHECK(tr.data() == arr.data());
+
+    auto d = tr.data_mut();
+    CHECK(tr.data_mut() != arr.data());
+    CHECK(tr.data() == tr.data_mut());
+    CHECK(arr.data() != tr.data_mut());
+
+    arr = tr.persistent();
+    CHECK(arr.data() == d);
+    CHECK(arr.data() == tr.data());
+
+    CHECK(tr.data_mut() != arr.data());
+    CHECK(tr.data() == tr.data_mut());
+    CHECK(arr.data() != tr.data_mut());
+}