* test: added unit test of builder
* test: Add unit tests for nodes.py
* test: add more unit tests in test_nodes
* test: try to fix the unit test error on GitHub
* test: reformate the code of test_nodes.py
* Fix the test error of reset the local argument
* Fixed the test error by setup args
* reformat the code
* test: add background node unit test
Change-Id: Ia99f5a1687464387dcb01bbee04deaa371c6e490
* test: add background node unit test
Change-Id: I9aabcf02ff04fda40c56f3ea22abe6b8f93bf9b6
* test: fix test error
Change-Id: I3997dc53a2cfaa35501a1fbda5902ee15528124e
* test: fix unit test error
Change-Id: If4c4cd10673e76a30945674c7cda198aeabf28d0
* test: fix unit test error
Change-Id: I3dd7a6179132e5497a30ada443d88de0c47af3d4