Update dummy_request tests to use make_preview_request
Update dummy_request tests to use make_preview_request

rsalmaso/wagtail,zerolab/wagtail,thenewguy/wagtail,jnns/wagtail,mixxorz/wagtail,torchbox/wagtail,rsalmaso/wagtail,nimasmi/wagtail,torchbox/wagtail,zerolab/wagtail,takeflight/wagtail,zerolab/wagtail,zerolab/wagtail,jnns/wagtail,jnns/wagtail,thenewguy/wagtail,timorieber/wagtail,takeflight/wagtail,timorieber/wagtail,mixxorz/wagtail,mikedingjan/wagtail,thenewguy/wagtail,thenewguy/wagtail,mixxorz/wagtail,takeflight/wagtail,nimasmi/wagtail,kaedroho/wagtail,FlipperPA/wagtail,rsalmaso/wagtail,timorieber/wagtail,kaedroho/wagtail,takeflight/wagtail,wagtail/wagtail,gasman/wagtail,mixxorz/wagtail,rsalmaso/wagtail,kaedroho/wagtail,mikedingjan/wagtail,timorieber/wagtail,zerolab/wagtail,mikedingjan/wagtail,wagtail/wagtail,FlipperPA/wagtail,torchbox/wagtail,FlipperPA/wagtail,gasman/wagtail,FlipperPA/wagtail,gasman/wagtail,nimasmi/wagtail,wagtail/wagtail,wagtail/wagtail,nimasmi/wagtail,gasman/wagtail,rsalmaso/wagtail,kaedroho/wagtail,thenewguy/wagtail,jnns/wagtail,torchbox/wagtail,mixxorz/wagtail,wagtail/wagtail,kaedroho/wagtail,mikedingjan/wagtail,gasman/wagtail