In 1957 Testut partnered with his compatriot Louis Chiron for the 24th edition of the Mille Miglia.

Testut's victory at the Vuillafans-Echevannes sport car event in 1957 earned him a congratulatory letter from the Maserati brothers, who had formed OSCA after being forced out of their company bearing their name.

[2] Testut entered 2 Formula One World Championship Grands Prix, both in Monaco, in 1958 and 1959.

Testut performed better at the 1958 Syracuse Grand Prix when he retired with engine failure when he was running seventh with ten laps to go.

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