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improved branch coverage

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This commit is contained in:
Niels 2016-08-21 14:39:54 +02:00
parent 0cf7ebaa57
commit 585a39a235
1 changed files with 146 additions and 4 deletions
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150
test/src/unit-allocator.cpp
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@ -28,13 +28,14 @@ SOFTWARE.
#include "catch.hpp" #include "catch.hpp"
#define private public
#include "json.hpp" #include "json.hpp"
using nlohmann::json; using nlohmann::json;
// special test case to check if memory is leaked if constructor throws // special test case to check if memory is leaked if constructor throws
template<class T> template<class T>
struct my_allocator : std::allocator<T> struct bad_allocator : std::allocator<T>
{ {
template<class... Args> template<class... Args>
void construct(T*, Args&& ...) void construct(T*, Args&& ...)
@ -48,16 +49,157 @@ TEST_CASE("bad_alloc")
SECTION("bad_alloc") SECTION("bad_alloc")
{ {
// create JSON type using the throwing allocator // create JSON type using the throwing allocator
using my_json = nlohmann::basic_json<std::map, using bad_json = nlohmann::basic_json<std::map,
std::vector, std::vector,
std::string, std::string,
bool, bool,
std::int64_t, std::int64_t,
std::uint64_t, std::uint64_t,
double, double,
my_allocator>; bad_allocator>;
// creating an object should throw // creating an object should throw
CHECK_THROWS_AS(my_json j(my_json::value_t::object), std::bad_alloc); CHECK_THROWS_AS(bad_json j(bad_json::value_t::object), std::bad_alloc);
}
}
bool next_allocation_fails = false;
template<class T>
struct my_allocator : std::allocator<T>
{
template<class... Args>
void construct(T* p, Args&& ... args)
{
if (next_allocation_fails)
{
throw std::bad_alloc();
}
else
{
::new(reinterpret_cast<void*>(p)) T(std::forward<Args>(args)...);
}
}
};
TEST_CASE("controlled bad_alloc")
{
// create JSON type using the throwing allocator
using my_json = nlohmann::basic_json<std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
my_allocator>;
SECTION("class json_value")
{
SECTION("json_value(value_t)")
{
SECTION("object")
{
next_allocation_fails = false;
auto t = my_json::value_t::object;
CHECK_NOTHROW(my_json::json_value j(t));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json::json_value j(t), std::bad_alloc);
next_allocation_fails = false;
}
SECTION("array")
{
next_allocation_fails = false;
auto t = my_json::value_t::array;
CHECK_NOTHROW(my_json::json_value j(t));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json::json_value j(t), std::bad_alloc);
next_allocation_fails = false;
}
SECTION("string")
{
next_allocation_fails = false;
auto t = my_json::value_t::string;
CHECK_NOTHROW(my_json::json_value j(t));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json::json_value j(t), std::bad_alloc);
next_allocation_fails = false;
}
}
SECTION("json_value(const string_t&)")
{
next_allocation_fails = false;
my_json::string_t v("foo");
CHECK_NOTHROW(my_json::json_value j(v));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json::json_value j(v), std::bad_alloc);
next_allocation_fails = false;
}
/*
SECTION("json_value(const object_t&)")
{
next_allocation_fails = false;
my_json::object_t v {{"foo", "bar"}};
CHECK_NOTHROW(my_json::json_value j(v));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json::json_value j(v), std::bad_alloc);
next_allocation_fails = false;
}
*/
/*
SECTION("json_value(const array_t&)")
{
next_allocation_fails = false;
my_json::array_t v = {"foo", "bar", "baz"};
CHECK_NOTHROW(my_json::json_value j(v));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json::json_value j(v), std::bad_alloc);
next_allocation_fails = false;
}
*/
}
SECTION("class basic_json")
{
SECTION("basic_json(const CompatibleObjectType&)")
{
next_allocation_fails = false;
std::map<std::string, std::string> v {{"foo", "bar"}};
CHECK_NOTHROW(my_json j(v));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json j(v), std::bad_alloc);
next_allocation_fails = false;
}
SECTION("basic_json(const CompatibleArrayType&)")
{
next_allocation_fails = false;
std::vector<std::string> v {"foo", "bar", "baz"};
CHECK_NOTHROW(my_json j(v));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json j(v), std::bad_alloc);
next_allocation_fails = false;
}
SECTION("basic_json(const typename string_t::value_type*)")
{
next_allocation_fails = false;
CHECK_NOTHROW(my_json v("foo"));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json v("foo"), std::bad_alloc);
next_allocation_fails = false;
}
SECTION("basic_json(const typename string_t::value_type*)")
{
next_allocation_fails = false;
std::string s("foo");
CHECK_NOTHROW(my_json v(s));
next_allocation_fails = true;
CHECK_THROWS_AS(my_json v(s), std::bad_alloc);
next_allocation_fails = false;
}
} }
} }