json/test/JSON_test.cc

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#include <iostream>
#include <fstream>
#include <cstdio>
#include <cassert>
#include <JSON.h>
#include <sstream>
void test_null() {
/* a null object */
// construct
JSON a, b;
// copy assign
b = JSON();
// copy construct
JSON c(a);
// copy construct
JSON d = a;
// assign operator
JSON e = JSON();
// compare
assert(a == b);
// type
assert(a.type() == JSON::null);
// empty and size
assert(a.size() == 0);
assert(a.empty() == true);
// output
std::cout << a << '\n';
// string represetations
assert(a.toString() == std::string("null"));
// invalid conversion to int
try {
int i = 0;
i = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast null to JSON number"));
}
// invalid conversion to double
try {
double f = 0;
f = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast null to JSON number"));
}
// invalid conversion to bool
try {
bool b = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast null to JSON Boolean"));
}
// invalid conversion to string
try {
std::string s = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast null to JSON string"));
}
}
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void test_bool() {
JSON True = true;
JSON False = false;
bool x = True;
}
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void test_string() {
/* a string object */
// construct
JSON a = "object a";
JSON b;
// copy assign
b = JSON("object a");
// copy construct
JSON c(a);
// copy construct
JSON d = a;
// assign operator
JSON e = JSON("");
// compare
assert(a == b);
// type
assert(a.type() == JSON::string);
// empty and size
assert(a.size() == 1);
assert(a.empty() == false);
// output
std::cout << a << '\n';
// string represetations
assert(a.toString() == std::string("\"object a\""));
// invalid conversion to int
try {
int i = 0;
i = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast string to JSON number"));
}
// invalid conversion to double
try {
double f = 0;
f = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast string to JSON number"));
}
// invalid conversion to bool
try {
bool b = false;
b = a;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot cast string to JSON Boolean"));
}
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{
// get payload
std::string* s1 = static_cast<std::string*>(a.data());
std::string s2 = a;
assert(*s1 == s2);
}
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}
void test_array() {
JSON a;
a += JSON();
a += 1;
a += 1.0;
a += true;
a += "string";
// type
assert(a.type() == JSON::array);
// empty and size
assert(a.size() == 5);
assert(a.empty() == false);
// output
std::cout << a << '\n';
// check for elements
assert(a[1] == JSON(1));
assert(a[2] == JSON(1.0));
assert(a[3] == JSON(true));
assert(a[4] == JSON("string"));
// invalid access to element
try {
a[5] = 1;
assert(false);
} catch (const std::exception& ex) {
assert(ex.what() == std::string("cannot access element at index 5"));
}
// get elements
{
int i = a[1];
double d = a[2];
bool b = a[3];
std::string s = a[4];
}
// set elements
a[1] = 2;
#ifdef __cplusplus11
// construction from initializer list
JSON b = {JSON(), 2, 1.0, true, "string"};
assert(a == b);
#endif
// iterators
for (JSON::iterator i = a.begin(); i != a.end(); ++i) {
std::cerr << *i << '\n';
}
for (JSON::const_iterator i = a.cbegin(); i != a.cend(); ++i) {
std::cerr << *i << '\n';
}
#ifdef __cplusplus11
for (auto element : a) {
std::cerr << element << '\n';
}
#endif
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{
// get payload
std::vector<JSON>* array = static_cast<std::vector<JSON>*>(a.data());
assert(array->size() == a.size());
assert(array->empty() == a.empty());
}
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}
void test_streaming() {
// stream text representation into stream
std::stringstream i;
i << "{ \"foo\": true, \"baz\": [1,2,3,4] }";
// create JSON from stream
{
JSON j, k;
i >> j;
k << i;
assert(j.toString() == k.toString());
}
// roundtrip
{
std::stringstream o;
JSON j, k;
i >> j;
j >> o;
o >> k;
assert(j.toString() == k.toString());
}
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// check numbers
{
std::stringstream number_stream;
number_stream << "[0, -1, 1, 1.0, -1.0, 1.0e+1, 1.0e-1, 1.0E+1, 1.0E-1, -1.2345678e-12345678]";
JSON j;
j << number_stream;
}
// check Unicode
{
std::stringstream unicode_stream;
unicode_stream << "[\"öäüÖÄÜß\", \"ÀÁÂÃĀĂȦ\", \"★☆→➠♥︎♦︎☁︎\"]";
JSON j;
j << unicode_stream;
}
// check escaped strings
{
std::stringstream escaped_stream;
escaped_stream << "[\"\\\"Hallo\\\"\", \"\u0123\"]";
JSON j;
j << escaped_stream;
}
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}
int main() {
test_null();
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test_bool();
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test_string();
test_array();
test_streaming();
return 0;
}