Any requirement to be tested is a violation of the Fourth Amendment’s prohibitions against searches and seizures without a warrant, and a warrant requires specific probable cause, not a general fear or suspicion.
It’s also a violation of the prohibition against Bills Of Attainder, and of the due process requirements of both the Fifth and Fourteenth Amendments.
For that reason, any enforcement any of such law or gubernatorial executive order is a felony violation of Title 18, section 242 of the US Code—which can be enforced against absolutely anyone, including governors, state legislators, county sheriffs and municipal police officers.
Just as the COVID "lockdowns" are violations of the First Amendment, "Red Flag" laws are violations of the Second and Sixth Amendment, etc. and etc.
It never seems to matter. The courts move at a glacial pace, and even when they take the cases and they move through the system, the Constitution usually seems to lose.
Under such violation of 18USC242, Trump needs to place the State of Washington under Federal control.