Migration of testing scripts in tools/ to libv2

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index ecdf02e3653ce8a348814442ad0564938c06b8cb..77cda3ce30d4a5933a208f227cefff86c7afa9c9 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -4,15 +4,6 @@
 
 package/invalid_uri_test: Fail, OK # Fails intentionally
 
-# These tests fail because the test scripts do not use the new streams library.
-# When the test scripts are updated, and the precompiled dart executable is
-# updated, they will be re-enabled.  Issue 7724.
-io/test_runner_test: Pass, Fail
-io/test_runner_exit_code_test: Pass, Fail
-status_expression_test: Pass, Fail
-io/status_file_parser_test: Pass, Fail
-io/skipping_dart2js_compilations_test: Pass, Fail
-
 [ $runtime == vm ]
 package/package_isolate_test: Fail # Issue 7520.