Add unit test for pkg/chart/chart.go
Add unit test for pkg/chart/chart.go

Signed-off-by: Hu Shuai <a4797ccdc3c71d8ffc5c17a5bb7f114e3818f278@cn.fujitsu.com>

bacongobbler/helm,adamreese/helm,michelleN/deployment-manager,adamreese/deployment-manager,michelleN/deployment-manager,adamreese/deployment-manager,michelleN/deployment-manager,helm/helm,adamreese/deployment-manager,adamreese/deployment-manager,adamreese/helm,adamreese/deployment-manager,bacongobbler/helm,helm/helm,michelleN/deployment-manager