[INTERNAL] sap.m.ComboBox: more unit test are added
[INTERNAL] sap.m.ComboBox: more unit test are added

Change-Id: Ia4316b61a2a69c0dafb38b2baa5c24be3d4b4d9a

olirogers/openui5,SAP/openui5,cschuff/openui5,olirogers/openui5,cschuff/openui5,olirogers/openui5,SQCLabs/openui5,SAP/openui5,nzamani/openui5,nzamani/openui5,SAP/openui5,cschuff/openui5,SQCLabs/openui5,SAP/openui5,nzamani/openui5,SQCLabs/openui5