See https://github.com/Microsoft/msphpsql/issues/955

PowerShell doesn't automatically handle exit codes of the invoked commands automatically, and $ErrorActionPreference = "Stop" doesn't seem working. Additionally, the ocular command is moved out of the "test_script" section to "after_test" since it's not part of the actual test.

See https://github.com/doctrine/dbal/pull/2617#discussion_r177250225.

Following a working cache example https://github.com/morozov/diff-sniffer-core/blob/master/.appveyor.yml