Method checkDict

Tests/EncoderTests.cc:140–148

    }

    const Dict* checkDict(uint32_t count) {
        auto v = Value::fromData(result);
        REQUIRE(v != nullptr);
        REQUIRE(v->type() == kDict);
        auto d = v->asDict();
        REQUIRE(d != nullptr);
        REQUIRE(d->count() == count);
        return d;
    }

    void testArrayOfLength(unsigned length) {
        enc.beginArray();