With std::pair
you can
make one type out of any other two. (And with std::tuple
you can make one type out of any other N).
You can write googletest TYPED_TEST
s in which TypeParam
assumes values from
a list of std::pair<X,Y>
, for paired parameter-types X
and Y
, so that each instantiation of such a TYPED_TEST
has X
defined as TypeParam::first_type
and Y
defined as TypeParam::second_type
. E.g:
gtester.cpp
#include <gtest/gtest.h>
#include <utility>
#include <cctype>
struct A1 {
char ch = 'A';
};
struct A2 {
char ch = 'a';
};
struct B1 {
char ch = 'B';
};
struct B2 {
char ch = 'b';
};
template <typename T>
class pair_test : public ::testing::Test {};
using test_types = ::testing::Types<std::pair<A1,A2>, std::pair<B1,B2>>;
TYPED_TEST_CASE(pair_test, test_types);
TYPED_TEST(pair_test, compare_no_case)
{
typename TypeParam::first_type param1;
typename TypeParam::second_type param2;
ASSERT_TRUE(param1.ch == std::toupper(param2.ch));
}
int main(int argc, char **argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
Compile, link, run:
$ g++ -Wall -o gtester gtester.cpp -lgtest -pthread && ./gtester
[==========] Running 2 tests from 2 test cases.
[----------] Global test environment set-up.
[----------] 1 test from pair_test/0, where TypeParam = std::pair<A1, A2>
[ RUN ] pair_test/0.compare_no_case
[ OK ] pair_test/0.compare_no_case (0 ms)
[----------] 1 test from pair_test/0 (0 ms total)
[----------] 1 test from pair_test/1, where TypeParam = std::pair<B1, B2>
[ RUN ] pair_test/1.compare_no_case
[ OK ] pair_test/1.compare_no_case (0 ms)
[----------] 1 test from pair_test/1 (0 ms total)
[----------] Global test environment tear-down
[==========] 2 tests from 2 test cases ran. (0 ms total)
[ PASSED ] 2 tests.