extensions: Minor test improvements (#26925)
extensions: Minor test improvements (#26925)

Expect console errors.
rsimha-amp/amphtml,yandex-pcode/amphtml,prateekbh/amphtml,voyagegroup/amphtml,zhouyx/amphtml,alanorozco/amphtml,jpettitt/amphtml,jridgewell/amphtml,sharethrough/amphtml,smartadserver/amphtml,jridgewell/amphtml,jpettitt/amphtml,smartadserver/amphtml,ampproject/amphtml,media-net/amphtml,zhouyx/amphtml,zhouyx/amphtml,rsimha-amp/amphtml,alanorozco/amphtml,lannka/amphtml,jridgewell/amphtml,jpettitt/amphtml,lannka/amphtml,honeybadgerdontcare/amphtml,cory-work/amphtml,adup-tech/amphtml,jridgewell/amphtml,ampproject/amphtml,voyagegroup/amphtml,yandex-pcode/amphtml,Gregable/amphtml,jridgewell/amphtml,ampproject/amphtml,yandex-pcode/amphtml,sharethrough/amphtml,cory-work/amphtml,alanorozco/amphtml,Gregable/amphtml,Gregable/amphtml,jmadler/amphtml,prateekbh/amphtml,adup-tech/amphtml,taboola/amphtml,lannka/amphtml,rsimha-amp/amphtml,adup-tech/amphtml,media-net/amphtml,danielrozenberg/amphtml,danielrozenberg/amphtml,Gregable/amphtml,cory-work/amphtml,taboola/amphtml,sharethrough/amphtml,jmadler/amphtml,taboola/amphtml,danielrozenberg/amphtml,mhc-gh/amphtml,danielrozenberg/amphtml,media-net/amphtml,adup-tech/amphtml,nexxtv/amphtml,prateekbh/amphtml,mhc-gh/amphtml,media-net/amphtml,mhc-gh/amphtml,taboola/amphtml,alanorozco/amphtml,honeybadgerdontcare/amphtml,cory-work/amphtml,Gregable/amphtml,rsimha-amp/amphtml,honeybadgerdontcare/amphtml,rsimha-amp/amphtml,alanorozco/amphtml,honeybadgerdontcare/amphtml,taboola/amphtml,danielrozenberg/amphtml,ampproject/amphtml,alanorozco/amphtml,jpettitt/amphtml,cory-work/amphtml,adup-tech/amphtml,sharethrough/amphtml,nexxtv/amphtml,jmadler/amphtml,prateekbh/amphtml,media-net/amphtml,ampproject/amphtml,ampproject/amphtml,smartadserver/amphtml,nexxtv/amphtml,mhc-gh/amphtml,honeybadgerdontcare/amphtml,prateekbh/amphtml,zhouyx/amphtml,prateekbh/amphtml,ampproject/amphtml,nexxtv/amphtml,Gregable/amphtml,jmadler/amphtml,media-net/amphtml,jpettitt/amphtml,jpettitt/amphtml,nexxtv/amphtml,rsimha-amp/amphtml,voyagegroup/amphtml,lannka/amphtml,alanorozco/amphtml,voyagegroup/amphtml,lannka/amphtml,sharethrough/amphtml,media-net/amphtml,mhc-gh/amphtml,sharethrough/amphtml,media-net/amphtml,ampproject/amphtml,honeybadgerdontcare/amphtml,lannka/amphtml,taboola/amphtml,jmadler/amphtml,mhc-gh/amphtml,danielrozenberg/amphtml,cory-work/amphtml,alanorozco/amphtml,voyagegroup/amphtml,jridgewell/amphtml,smartadserver/amphtml,yandex-pcode/amphtml,yandex-pcode/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,adup-tech/amphtml,voyagegroup/amphtml,mhc-gh/amphtml,jpettitt/amphtml,zhouyx/amphtml,honeybadgerdontcare/amphtml,yandex-pcode/amphtml,Gregable/amphtml,taboola/amphtml,nexxtv/amphtml,jmadler/amphtml,Gregable/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,zhouyx/amphtml,jpettitt/amphtml,lannka/amphtml,zhouyx/amphtml,cory-work/amphtml,smartadserver/amphtml,danielrozenberg/amphtml,smartadserver/amphtml,yandex-pcode/amphtml,prateekbh/amphtml,rsimha-amp/amphtml,nexxtv/amphtml