AndroidStudio3.2Canary2Build#AI-173.4591728,builtonFebruary8,2018JRE:1.8.0_152-release-1024-b01amd64JVM:OpenJDK64-BitServerVMbyJetBrainss.r.oLinux4.14.18-300.fc27.x86_64我有以下Activity，我想对fragment已附加并应返回非空值的情况进行单元测试。并且应该属于else条件:这是我的Activity:publicclassBillingActivityextendsAppCompatActivity{@Overr

getFragmentManager().beginTransaction().replace(R.id.graph_fragment_holder,newGraphFragment(),"GRAPH_FRAGMENT").commit();getFragmentManager().beginTransaction().replace(R.id.list_fragment_holder,newListFragment(),"LIST_FRAGMENT").commit();//getFragmentManager().executePendingTransactions();Graph