Added tests for AdminPageChooser widget
Added tests for AdminPageChooser widget

Looks like a public API to me so deserves some tests/docs

timorieber/wagtail,nealtodd/wagtail,serzans/wagtail,jnns/wagtail,hamsterbacke23/wagtail,Toshakins/wagtail,nilnvoid/wagtail,zerolab/wagtail,kaedroho/wagtail,hamsterbacke23/wagtail,wagtail/wagtail,Toshakins/wagtail,mikedingjan/wagtail,nrsimha/wagtail,wagtail/wagtail,rjsproxy/wagtail,gogobook/wagtail,rsalmaso/wagtail,kurtw/wagtail,gasman/wagtail,mayapurmedia/wagtail,chrxr/wagtail,nutztherookie/wagtail,gasman/wagtail,gasman/wagtail,nrsimha/wagtail,timorieber/wagtail,wagtail/wagtail,takeflight/wagtail,WQuanfeng/wagtail,rsalmaso/wagtail,kurtw/wagtail,jnns/wagtail,quru/wagtail,FlipperPA/wagtail,mjec/wagtail,WQuanfeng/wagtail,takeshineshiro/wagtail,WQuanfeng/wagtail,thenewguy/wagtail,JoshBarr/wagtail,nilnvoid/wagtail,serzans/wagtail,Tivix/wagtail,nutztherookie/wagtail,kurtw/wagtail,Toshakins/wagtail,timorieber/wagtail,gasman/wagtail,jnns/wagtail,Pennebaker/wagtail,nrsimha/wagtail,quru/wagtail,zerolab/wagtail,mjec/wagtail,kurtrwall/wagtail,Klaudit/wagtail,zerolab/wagtail,thenewguy/wagtail,mjec/wagtail,thenewguy/wagtail,tangentlabs/wagtail,gogobook/wagtail,kaedroho/wagtail,inonit/wagtail,zerolab/wagtail,kaedroho/wagtail,davecranwell/wagtail,mikedingjan/wagtail,chrxr/wagtail,Klaudit/wagtail,wagtail/wagtail,mayapurmedia/wagtail,rjsproxy/wagtail,mixxorz/wagtail,nrsimha/wagtail,iansprice/wagtail,gasman/wagtail,nimasmi/wagtail,thenewguy/wagtail,timorieber/wagtail,hanpama/wagtail,tangentlabs/wagtail,mikedingjan/wagtail,Tivix/wagtail,hamsterbacke23/wagtail,serzans/wagtail,iansprice/wagtail,tangentlabs/wagtail,FlipperPA/wagtail,takeshineshiro/wagtail,Tivix/wagtail,davecranwell/wagtail,takeshineshiro/wagtail,FlipperPA/wagtail,rsalmaso/wagtail,nutztherookie/wagtail,nutztherookie/wagtail,mixxorz/wagtail,JoshBarr/wagtail,serzans/wagtail,Tivix/wagtail,takeflight/wagtail,inonit/wagtail,kurtrwall/wagtail,mixxorz/wagtail,gogobook/wagtail,mikedingjan/wagtail,davecranwell/wagtail,chrxr/wagtail,JoshBarr/wagtail,rjsproxy/wagtail,Pennebaker/wagtail,kurtrwall/wagtail,rsalmaso/wagtail,gogobook/wagtail,hanpama/wagtail,Pennebaker/wagtail,inonit/wagtail,wagtail/wagtail,Pennebaker/wagtail,WQuanfeng/wagtail,hanpama/wagtail,Klaudit/wagtail,nilnvoid/wagtail,nealtodd/wagtail,davecranwell/wagtail,takeshineshiro/wagtail,Klaudit/wagtail,kurtrwall/wagtail,nimasmi/wagtail,rjsproxy/wagtail,torchbox/wagtail,inonit/wagtail,iansprice/wagtail,FlipperPA/wagtail,hamsterbacke23/wagtail,tangentlabs/wagtail,nealtodd/wagtail,nimasmi/wagtail,JoshBarr/wagtail,kaedroho/wagtail,mixxorz/wagtail,nimasmi/wagtail,thenewguy/wagtail,mjec/wagtail,takeflight/wagtail,mixxorz/wagtail,nealtodd/wagtail,kurtw/wagtail,rsalmaso/wagtail,quru/wagtail,iansprice/wagtail,kaedroho/wagtail,mayapurmedia/wagtail,jnns/wagtail,torchbox/wagtail,hanpama/wagtail,chrxr/wagtail,quru/wagtail,torchbox/wagtail,Toshakins/wagtail,nilnvoid/wagtail,takeflight/wagtail,mayapurmedia/wagtail,torchbox/wagtail,zerolab/wagtail