#include
#include
using namespace testing;
using namespace stream;
using namespace stream::op;
using namespace std::string_literals;
std::string int_concat(std::string&& s, int x) {
std::stringstream ss;
ss << s << x;
return ss.str();
}
std::string to_string(int x) {
return int_concat("", x);
}
#define EXCEPTION_TEST(Operation, Exception) \
[](){ \
bool thrown = false; \
try { Operation; } catch(Exception& e) { thrown = true; } \
return thrown; \
}()
#define EXPECT_EXCEPTION(Operation, Exception) \
EXPECT_THAT(EXCEPTION_TEST(Operation, Exception), Eq(true));
TEST(Reduce, NoIdentity) {
EXPECT_THAT(MakeStream::range(1, 6) | reduce(std::plus{}), Eq(15));
EXPECT_EXCEPTION(MakeStream::empty() | reduce(std::plus{}), EmptyStreamException);
}
TEST(Reduce, IdentityFunction) {
EXPECT_THAT(MakeStream::range(1, 6) | reduce(to_string, int_concat), Eq("12345"s));
EXPECT_EXCEPTION(MakeStream::empty() | reduce(to_string, int_concat),
EmptyStreamException);
}
TEST(Reduce, SameTypeIdentity) {
EXPECT_THAT(MakeStream::range(1, 6) | identity_reduce(1, std::multiplies{}),
Eq(120));
EXPECT_THAT(MakeStream::empty() | identity_reduce(1, std::multiplies{}),
Eq(1));
}
TEST(Reduce, DiffTypeIdentity) {
EXPECT_THAT(MakeStream::range(1, 6) | identity_reduce(""s, int_concat),
Eq("12345"s));
EXPECT_THAT(MakeStream::empty() | identity_reduce("BLAH"s, int_concat),
Eq("BLAH"s));
}