Boost.Test > Components > The Unit Test Framework > Parameters > Log level

# The 'log level' parameter

Parameter Name: | The Unit Test Framework log level
Environment variable name: | BOOST_TEST_LOG_LEVEL
Command line argument name: | log_level
Acceptable Values: |

all | - report all log messages including the passed test notification
success | - the same as all
test_suite | - show test suite messages
message | - show user messages
warning | - report warnings issued by user
error | - report all error conditions
cpp_exception | - report uncaught c++ exception
system_error | - report system originated non-fatal errors (for example, timeout or floating point exception)
fatal_error | - report only user or system originated fatal errors (for example, memory access violation)
nothing | - does not report any information

Description: | allows to set the Unit Test Framework log level in a range from a complete log, when all successful tests are confirmed and all test suite messages are included, to an empty log when nothing is logged a test output stream. Note that log levels are accumulating, in other words each log level includes also all the information reported by less restrictive ones.