Additional messages can be logged during a test case. Note that the messages are scoped and thus will not be reported if failure occurs in scope preceding the message declaration. An example:
```cpp
TEST_CASE("Foo") {
INFO("Test case start");
for (int i = 0; i <2;++i){
INFO("The number is " <<i);
CHECK(i == 0);
}
}
TEST_CASE("Bar") {
INFO("Test case start");
for (int i = 0; i <2;++i){
INFO("The number is " <<i);
CHECK(i == i);
}
CHECK(false);
}
```
When the `CHECK` fails in the "Foo" test case, then two messages will be printed.
```
Test case start
The number is 1
```
When the last `CHECK` fails in the "Bar" test case, then only one message will be printed: `Test case start`.
All these macros allow heterogenous sequences of values to be streaming using the insertion operator (```<<```) in the same way that std::ostream, std::cout, etc support it.
E.g.:
```c++
INFO( "The number is " <<i);
```
(Note that there is no initial ```<<``` - instead the insertion sequence is placed in parentheses.)
The message is logged to a buffer, but only reported with the next assertion that is logged. This allows you to log contextual information in case of failures which is not shown during a successful test run (for the console reporter, without -s). Messages are removed from the buffer at the end of their scope, so may be used, for example, in loops.
