Feature #3275
Feature #3264: Support for is_snippet_test_mode
Snippet-v0.95: Support for is_snippet_test_mode.
Description
Please implement https://docs.google.com/document/d/11BCdo410_7bQvtUMXadjQmMkPggpZIv80kt14BkR5Zc/edit.
Set the default value for is_snippet_test_mode to true.