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diff --git a/test/vector_transient/generic.ipp b/test/vector_transient/generic.ipp
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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 "test/dada.hpp"
+#include "test/transient_tester.hpp"
+#include "test/util.hpp"
+
+#include <catch.hpp>
+
+#ifndef VECTOR_T
+#error "define the vector template to use in VECTOR_T"
+#endif
+
+#ifndef VECTOR_TRANSIENT_T
+#error "define the vector template to use in VECTOR_TRANSIENT_T"
+#endif
+
+template <typename V = VECTOR_T<unsigned>>
+auto make_test_vector(unsigned min, unsigned max)
+{
+    auto v = V{};
+    for (auto i = min; i < max; ++i)
+        v = v.push_back({i});
+    return v;
+}
+
+TEST_CASE("from vector and to vector")
+{
+    constexpr auto n = 100u;
+
+    auto v = make_test_vector(0, n).transient();
+    CHECK_VECTOR_EQUALS(v, boost::irange(0u, n));
+
+    auto p = v.persistent();
+    CHECK_VECTOR_EQUALS(p, boost::irange(0u, n));
+}
+
+TEST_CASE("protect persistence")
+{
+    auto v = VECTOR_T<unsigned>{}.transient();
+    v.push_back(12);
+    auto p = v.persistent();
+    v.set(0, 42);
+    CHECK(p[0] == 12);
+    CHECK(v[0] == 42);
+}
+
+TEST_CASE("push back move")
+{
+    using vector_t = VECTOR_T<unsigned>;
+
+    auto v = vector_t{};
+
+    auto check_move = [&](vector_t&& x) -> vector_t&& {
+        if (vector_t::memory_policy::use_transient_rvalues)
+            CHECK(&x == &v);
+        else
+            CHECK(&x != &v);
+        return std::move(x);
+    };
+
+    v                = check_move(std::move(v).push_back(0));
+    v                = check_move(std::move(v).push_back(1));
+    v                = check_move(std::move(v).push_back(2));
+    auto addr_before = &v[0];
+    v                = check_move(std::move(v).push_back(3));
+    auto addr_after  = &v[0];
+
+    if (vector_t::memory_policy::use_transient_rvalues)
+        CHECK(addr_before == addr_after);
+    else
+        CHECK(addr_before != addr_after);
+
+    CHECK_VECTOR_EQUALS(v, boost::irange(0u, 4u));
+}
+
+TEST_CASE("set move")
+{
+    using vector_t = VECTOR_T<unsigned>;
+
+    auto v = vector_t{};
+
+    auto check_move = [&](vector_t&& x) -> vector_t&& {
+        if (vector_t::memory_policy::use_transient_rvalues)
+            CHECK(&x == &v);
+        else
+            CHECK(&x != &v);
+        return std::move(x);
+    };
+
+    v = v.push_back(0);
+
+    auto addr_before = &v[0];
+    v                = check_move(std::move(v).set(0, 1));
+    auto addr_after  = &v[0];
+
+    if (vector_t::memory_policy::use_transient_rvalues)
+        CHECK(addr_before == addr_after);
+    else
+        CHECK(addr_before != addr_after);
+
+    CHECK_VECTOR_EQUALS(v, boost::irange(1u, 2u));
+}
+
+TEST_CASE("update move")
+{
+    using vector_t = VECTOR_T<unsigned>;
+
+    auto v = vector_t{};
+
+    auto check_move = [&](vector_t&& x) -> vector_t&& {
+        if (vector_t::memory_policy::use_transient_rvalues)
+            CHECK(&x == &v);
+        else
+            CHECK(&x != &v);
+        return std::move(x);
+    };
+
+    v = v.push_back(0);
+
+    auto addr_before = &v[0];
+    v = check_move(std::move(v).update(0, [](auto x) { return x + 1; }));
+    auto addr_after = &v[0];
+
+    if (vector_t::memory_policy::use_transient_rvalues)
+        CHECK(addr_before == addr_after);
+    else
+        CHECK(addr_before != addr_after);
+
+    CHECK_VECTOR_EQUALS(v, boost::irange(1u, 2u));
+}
+
+TEST_CASE("take move")
+{
+    using vector_t = VECTOR_T<unsigned>;
+
+    auto v = vector_t{};
+
+    auto check_move = [&](vector_t&& x) -> vector_t&& {
+        if (vector_t::memory_policy::use_transient_rvalues)
+            CHECK(&x == &v);
+        else
+            CHECK(&x != &v);
+        return std::move(x);
+    };
+
+    v = v.push_back(0).push_back(1);
+
+    auto addr_before = &v[0];
+    v                = check_move(std::move(v).take(1));
+    auto addr_after  = &v[0];
+
+    if (vector_t::memory_policy::use_transient_rvalues)
+        CHECK(addr_before == addr_after);
+    else
+        CHECK(addr_before != addr_after);
+
+    CHECK_VECTOR_EQUALS(v, boost::irange(0u, 1u));
+}
+
+TEST_CASE("exception safety")
+{
+    constexpr auto n = 667u;
+
+    using dadaist_vector_t = typename dadaist_wrapper<VECTOR_T<unsigned>>::type;
+
+    SECTION("push back")
+    {
+        auto t = as_transient_tester(dadaist_vector_t{});
+        auto d = dadaism{};
+        for (auto li = 0u, i = 0u; i < n;) {
+            auto s = d.next();
+            try {
+                if (t.transient)
+                    t.vt.push_back({i});
+                else
+                    t.vp = t.vp.push_back({i});
+                ++i;
+                if (t.step())
+                    li = i;
+            } catch (dada_error) {}
+            if (t.transient) {
+                CHECK_VECTOR_EQUALS(t.vt, boost::irange(0u, i));
+                CHECK_VECTOR_EQUALS(t.vp, boost::irange(0u, li));
+            } else {
+                CHECK_VECTOR_EQUALS(t.vp, boost::irange(0u, i));
+                CHECK_VECTOR_EQUALS(t.vt, boost::irange(0u, li));
+            }
+        }
+        CHECK(d.happenings > 0);
+        CHECK(t.d.happenings > 0);
+        IMMER_TRACE_E(d.happenings);
+        IMMER_TRACE_E(t.d.happenings);
+    }
+
+    SECTION("update")
+    {
+        using boost::irange;
+        using boost::join;
+
+        auto t = as_transient_tester(make_test_vector<dadaist_vector_t>(0, n));
+        auto d = dadaism{};
+        for (auto li = 0u, i = 0u; i < n;) {
+            auto s = d.next();
+            try {
+                if (t.transient)
+                    t.vt.update(i, [](auto x) { return dada(), x + 1; });
+                else
+                    t.vp = t.vp.update(i, [](auto x) { return dada(), x + 1; });
+                ++i;
+                if (t.step())
+                    li = i;
+            } catch (dada_error) {}
+            if (t.transient) {
+                CHECK_VECTOR_EQUALS(t.vt,
+                                    join(irange(1u, 1u + i), irange(i, n)));
+                CHECK_VECTOR_EQUALS(t.vp,
+                                    join(irange(1u, 1u + li), irange(li, n)));
+            } else {
+                CHECK_VECTOR_EQUALS(t.vp,
+                                    join(irange(1u, 1u + i), irange(i, n)));
+                CHECK_VECTOR_EQUALS(t.vt,
+                                    join(irange(1u, 1u + li), irange(li, n)));
+            }
+        }
+        CHECK(d.happenings > 0);
+        CHECK(t.d.happenings > 0);
+    }
+
+    SECTION("take")
+    {
+        auto t = as_transient_tester(make_test_vector<dadaist_vector_t>(0, n));
+        auto d = dadaism{};
+        auto deltas = magic_rotator();
+        auto delta  = 0u;
+        for (auto i = n, li = i;;) {
+            auto s = d.next();
+            auto r = dadaist_vector_t{};
+            try {
+                if (t.transient)
+                    t.vt.take(i);
+                else
+                    t.vp = t.vp.take(i);
+                if (t.step())
+                    li = i;
+                delta = deltas.next();
+                if (i < delta)
+                    break;
+                i -= delta;
+            } catch (dada_error) {}
+            if (t.transient) {
+                CHECK_VECTOR_EQUALS(t.vt, boost::irange(0u, i + delta));
+                CHECK_VECTOR_EQUALS(t.vp, boost::irange(0u, li));
+            } else {
+                CHECK_VECTOR_EQUALS(t.vp, boost::irange(0u, i + delta));
+                CHECK_VECTOR_EQUALS(t.vt, boost::irange(0u, li));
+            }
+        }
+        CHECK(d.happenings > 0);
+        CHECK(t.d.happenings > 0);
+    }
+}