estuvieron testeando
-they/you were testing
Preterite progressive ellos/ellas/ustedes conjugation of testear.

testear

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Tanto este operador como la Unión de Cooperativas estuvieron testeando vehículos a gas natural por más de un año, desde mayo de 2010.
This operator and the Transport Cooperatives Union were testing NGVs for more than a year, beginning in May 2010.
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