When trying to use the integrated test side bar, no tests are being displayed. When clicking on "refresh" an error message is displayed saying "command 'sfdx.force.test.view.refresh' not found". Besides, test classes do not show the "run test" commands.
Steps To Reproduce:
Open project in VSCode
Open the Test side bar and see that is empty.
Click on the "Refresh" icon and you will see the error
A list of available test is displayed