Show the help message.
protected function showHelp() {
PHPUnit_TextUI_TestRunner::printVersionString();
print <<<EOT
Usage: phpunit [switches] UnitTest [UnitTest.php]
phpunit [switches] <directory>
--log-junit <file> Log test execution in JUnit XML format to file.
--log-tap <file> Log test execution in TAP format to file.
--log-json <file> Log test execution in JSON format.
--coverage-clover <file> Generate code coverage report in Clover XML format.
--coverage-html <dir> Generate code coverage report in HTML format.
--coverage-php <file> Serialize PHP_CodeCoverage object to file.
--coverage-text=<file> Generate code coverage report in text format.
Default to writing to the standard output.
--testdox-html <file> Write agile documentation in HTML format to file.
--testdox-text <file> Write agile documentation in Text format to file.
--filter <pattern> Filter which tests to run.
--testsuite <pattern> Filter which testsuite to run.
--group ... Only runs tests from the specified group(s).
--exclude-group ... Exclude tests from the specified group(s).
--list-groups List available test groups.
--test-suffix ... Only search for test in files with specified
suffix(es). Default: Test.php,.phpt
--loader <loader> TestSuiteLoader implementation to use.
--printer <printer> TestSuiteListener implementation to use.
--repeat <times> Runs the test(s) repeatedly.
--tap Report test execution progress in TAP format.
--testdox Report test execution progress in TestDox format.
--colors Use colors in output.
--stderr Write to STDERR instead of STDOUT.
--stop-on-error Stop execution upon first error.
--stop-on-failure Stop execution upon first error or failure.
--stop-on-skipped Stop execution upon first skipped test.
--stop-on-incomplete Stop execution upon first incomplete test.
--strict Run tests in strict mode.
-v|--verbose Output more verbose information.
--debug Display debugging information during test execution.
--process-isolation Run each test in a separate PHP process.
--no-globals-backup Do not backup and restore \$GLOBALS for each test.
--static-backup Backup and restore static attributes for each test.
--bootstrap <file> A "bootstrap" PHP file that is run before the tests.
-c|--configuration <file> Read configuration from XML file.
--no-configuration Ignore default configuration file (phpunit.xml).
--include-path <path(s)> Prepend PHP's include_path with given path(s).
-d key[=value] Sets a php.ini value.
-h|--help Prints this usage information.
--version Prints the version and exits.
EOT;
}