Testas began playing football at the youth level with S.L. Benfica, but signed his first professional contract with Vitória S.C. in the Primeira Liga. In 1963, he signed with F.C. Barreirense in the Segunda Divisão Portuguesa, where he won the league in 1968, and the Taça Ribeiro dos Reis. In 1968, he signed with S.C. Farense and had stints with Gil Vicente, and AD Fafe. In 1975, he played abroad in the National Soccer League with Toronto Italia, where he won the First Divisiontitle. The following season he assisted and contributed a goal in securing the NSL Championship after defeating Hamilton Croatia. In 1977, he signed with Montreal Castors, and secured the NSL Championship in 1978, and 1979. He returned to Europe for the 1977 season to sign with Leixões S.C.. In 1979, he returned to North America to sign with the Buffalo Stallions of the Major Indoor Soccer League. In 1980, he concluded his career in the National Soccer League with First Portuguese, and assisted the club in finishing second in the regular season standings.
Managerial career
In 2003, he was appointed the head coach of the Toronto Supra in the Canadian Professional Soccer League. He would have a successful season achieving a 16-game undefeated streak, and maintaining their record until the final two games of the season. He led Toronto to a second-place finish in the Eastern Conference and posted the second best offensive record within the league. In the postseason Supra faced Vaughan Sun Devils, but were defeated in overtime in a 4–3 loss. On October 5, 2003, at the CPSL Awards Banquet he was awarded the CPSL Coach of the Year. He returned to manage Toronto for the 2004 season, and won the organization's first piece of silverware by clinching the Eastern Conference title. In the playoffs Toronto faced the Vaughan Shooters, but were eliminated by a score of 4–1. For 2005, he was brought back halfway through the season, but failed to improve the team's performance, and failed to qualify for the postseason. In 2008, he returned to the organization, and greatly improved the team's performance by finishing in the top five with the best offensive and defensive records. The team secured a postseason berth by finishing fourth in the International Division and finishing fifth in the overall standings. In the quarterfinals Portugal faced Toronto Croatia and advanced to the next round with a 2–1 victory with goals. In the semifinals their opponents were National Division champions Trois-Rivières Attak, but were eliminated from a 7–0 defeat.
