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50 lines
1.6 KiB
Markdown
50 lines
1.6 KiB
Markdown
# Logging macros
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Additional messages can be logged during a test case.
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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 if a subsequent failure occurs within the same test case. This allows you to log contextual information in case of failures which is not shown during a successful test run. The buffer is cleared on the next successful assertion.
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**SCOPED_INFO(** _message expression_ **)**
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As INFO, but is only in effect during the current scope. If a failure occurs beyond the end of the scope the message is not logged. In a looped block the message is reset on each iteration.
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**WARN(** _message expression_ **)**
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The message is always reported.
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**FAIL(** _message expression_ **)**
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The message is reported and the test case fails.
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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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---
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[Home](../README.md) |