82 lines
2.4 KiB
Markdown
82 lines
2.4 KiB
Markdown
# Logging macros
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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:
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```cpp
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TEST_CASE("Foo") {
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INFO("Test case start");
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for (int i = 0; i < 2; ++i) {
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INFO("The number is " << i);
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CHECK(i == 0);
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}
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}
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TEST_CASE("Bar") {
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INFO("Test case start");
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for (int i = 0; i < 2; ++i) {
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INFO("The number is " << i);
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CHECK(i == i);
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}
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CHECK(false);
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}
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```
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When the `CHECK` fails in the "Foo" test case, then two messages will be printed.
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```
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Test case start
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The number is 1
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```
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When the last `CHECK` fails in the "Bar" test case, then only one message will be printed: `Test case start`.
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## Streaming macros
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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.
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E.g.:
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```c++
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INFO( "The number is " << i );
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```
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(Note that there is no initial ```<<``` - instead the insertion sequence is placed in parentheses.)
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These macros come in three forms:
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**INFO(** _message expression_ **)**
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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.
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**WARN(** _message expression_ **)**
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The message is always reported but does not fail the test.
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**FAIL(** _message expression_ **)**
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The message is reported and the test case fails.
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**FAIL_CHECK(** _message expression_ **)**
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AS `FAIL`, but does not abort the test
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## Quickly capture a variable value
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**CAPTURE(** _expression_ **)**
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Sometimes you just want to log the name and value of a variable. While you can easily do this with the INFO macro, above, as a convenience the CAPTURE macro handles the stringising of the variable name for you (actually it works with any expression, not just variables).
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E.g.
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```c++
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CAPTURE( theAnswer );
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```
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This would log something like:
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<pre>"theAnswer := 42"</pre>
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## Deprecated macros
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**SCOPED_INFO and SCOPED_CAPTURE**
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These macros are now deprecated and are just aliases for INFO and CAPTURE (which were not previously scoped).
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---
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[Home](Readme.md) |