estaban testando
-they/you were testing
Imperfect progressive ellos/ellas/ustedes conjugation of testar.

testar

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Poco después, trabajó durante seis meses como investigador especial en Dublín, Irlanda, probando las baterías de níquel-zinc experimentales que se estaban testando para la línea ferroviaria de Harcourt Street, perteneciente a la empresa Great Southern Railways.
Afterwards, he spent six months working as a special investigator for Dublin 's Great Southern Railways, testing the Drumm nickel-zinc rechargeable batteries used on the Dublin–Bray line.
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