Fix channel tests to not leak test data into each other
Fix channel tests to not leak test data into each other

ewheeler/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,tsotetsi/textily-web,pulilab/rapidpro,ewheeler/rapidpro,reyrodrigues/EU-SMS,pulilab/rapidpro,pulilab/rapidpro,reyrodrigues/EU-SMS,reyrodrigues/EU-SMS,pulilab/rapidpro,ewheeler/rapidpro,tsotetsi/textily-web,pulilab/rapidpro,tsotetsi/textily-web,tsotetsi/textily-web