pkg/unittest: More explicit skipping of src file that looks like test

.status

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Skip non-test files ending with "_test".
 packages/*: Skip
 */packages/*: Skip
 */*/packages/*: Skip
 */*/*/packages/*: Skip
 */*/*/*packages/*: Skip
 */*/*/*/*packages/*: Skip
 
 # Only run tests from the build directory, since we don't care about the
 # difference between transformed an untransformed code.
 test/*: Skip
 
-# Skip test-looking files in the lib directory
-lib/*: Skip
+unittest/lib/src/live_test: Skip # Don't run library files as tests
 
 [ $runtime == jsshell ]
 build/test/missing_tick_test: Fail # Timer interface not supported: dartbug.com/7728
 build/test/nested_groups_setup_teardown_test: RuntimeError # http://dartbug.com/10109
 
 [ $compiler == none && ( $runtime == dartium || $runtime == drt || $runtime == ContentShellOnAndroid) ]
 # Skip serialization test that explicitly has no library declaration in the
 # test on Dartium, which requires all tests to have a library.
 build/test/async_exception_test: RuntimeError # 13921
 build/test/async_exception_with_future_test: RuntimeError # 13921
@@ skipping 30 matching lines @@
 # The unminified matcher tests test that the real names of Dart types are
 # printed. Minified versions of these tests exist that test the behavior when
 # minified.
 build/test/*_unminified_test: Skip # DO NOT COPY THIS UNLESS YOU WORK ON DART2JS
 
 [ $minified == false ]
 # The minified matcher tests test that the minified names of Dart types are
 # printed. Unminified versions of these tests exist that test the behavior when
 # not minified.
 build/test/*_minified_test: Skip # DO NOT COPY THIS UNLESS YOU WORK ON DART2JS