Write operations can't be chained

[richardszalay]

Because writes to the hosts file aren't committed until EndProcessing, piping together write operations fail. For example, the following test fails Set re-reads the hosts file and doesn't find the added entry (because it hasn't been saved yet). It would also cause undefined side effects as both cmdlets would attempt to save their copy of the hosts file.

I'm not sure the best way to resolve this problem (particularly since it's quite unlikely that someone would pipe the write operations together), but I thought it was worth documenting.

Describe "Add-HostEntry" {
    Context "Piping into Set" {
        BeforeEach {
            Add-TestHostEntry -Name "hostname" -Loopback -HostsPath $hostsFile | `
                Set-TestHostEntry -Address "127.0.0.2" -HostsPath $hostsFile
        }

        It "Should update new entry" {
            $results = Get-TestHostEntry hostname -HostsPath $hostsFile

            $results.Length | Should be 1
        }
    }
}