mirror of
https://github.com/catchorg/Catch2.git
synced 2024-11-04 21:29:54 +01:00
98 lines
3.0 KiB
Markdown
98 lines
3.0 KiB
Markdown
<a id="top"></a>
|
|
# Logging macros
|
|
|
|
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`.
|
|
|
|
|
|
## Streaming macros
|
|
|
|
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.)
|
|
These macros come in three forms:
|
|
|
|
**INFO(** _message expression_ **)**
|
|
|
|
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.
|
|
|
|
_Note that in Catch2 2.x.x `INFO` can be used without a trailing semicolon as there is a trailing semicolon inside macro.
|
|
This semicolon will be removed with next major version. It is highly advised to use a trailing semicolon after `INFO` macro._
|
|
|
|
**WARN(** _message expression_ **)**
|
|
|
|
The message is always reported but does not fail the test.
|
|
|
|
**FAIL(** _message expression_ **)**
|
|
|
|
The message is reported and the test case fails.
|
|
|
|
**FAIL_CHECK(** _message expression_ **)**
|
|
|
|
AS `FAIL`, but does not abort the test
|
|
|
|
## Quickly capture value of variables or expressions
|
|
|
|
**CAPTURE(** _expression1_, _expression2_, ... **)**
|
|
|
|
Sometimes you just want to log a value of variable, or expression. For
|
|
convenience, we provide the `CAPTURE` macro, that can take a variable,
|
|
or an expression, and prints out that variable/expression and its value
|
|
at the time of capture.
|
|
|
|
e.g. `CAPTURE( theAnswer );` will log message "theAnswer := 42", while
|
|
```cpp
|
|
int a = 1, b = 2, c = 3;
|
|
CAPTURE( a, b, c, a + b, c > b, a == 1);
|
|
```
|
|
will log a total of 6 messages:
|
|
```
|
|
a := 1
|
|
b := 2
|
|
c := 3
|
|
a + b := 3
|
|
c > b := true
|
|
a == 1 := true
|
|
```
|
|
|
|
You can also capture expressions that use commas inside parentheses
|
|
(e.g. function calls), brackets, or braces (e.g. initializers). To
|
|
properly capture expression that contains template parameters list
|
|
(in other words, it contains commas between angle brackets), you need
|
|
to enclose the expression inside parentheses:
|
|
`CAPTURE( (std::pair<int, int>{1, 2}) );`
|
|
|
|
|
|
---
|
|
|
|
[Home](Readme.md#top)
|