Add unsafe vector test case

test/flex_vector/unsafe.cpp

@@ -8,6 +8,7 @@
 
 #include <immer/flex_vector.hpp>
 #include <immer/memory_policy.hpp>
+#include <immer/vector.hpp>
 
 using unsafe_memory = immer::memory_policy<immer::unsafe_free_list_heap_policy<immer::cpp_heap>,
                                            immer::no_refcount_policy,

test/vector/unsafe.cpp

@@ -0,0 +1,20 @@
+//
+// 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/memory_policy.hpp>
+#include <immer/vector.hpp>
+
+using unsafe_memory = immer::memory_policy<immer::unsafe_free_list_heap_policy<immer::cpp_heap>,
+                                           immer::no_refcount_policy,
+                                           immer::no_lock_policy>;
+
+template <typename T>
+using test_vector_t = immer::vector<T, unsafe_memory, 3u, 6u>;
+
+#define VECTOR_T test_vector_t
+#include "generic.ipp"