I am trying to implement RSpec/Jasmine like BDD framework in Powershell (or at least research the potential problems with making one).
Currently I am having problems with implementing simple before/after functionality. Given
$ErrorActionPreference = "Stop"
function describe()
{
$aaaa = 0;
before { $aaaa = 2; };
after { $aaaa; }
}
function before( [scriptblock]$sb )
{
& $sb
}
function after( $sb )
{
& $sb
}
describe
the output is 0, but I would like it to be 2. Is there any way to achieve it in Powershell (short of making $aaaa global, traversing parent scopes in script blocks till $aaaa is found, making $aaaa an "object" and other dirty hacks:) )
What I would ideally like is a way to invoke a script block in some other scope but I don't have a clue whether it is possible at all. I found an interesting example at https://connect.microsoft.com/PowerShell/feedback/details/560504/scriptblock-gets-incorrect-parent-scope-in-module (see workaround), but am not sure how it works and if it helps me in any way.
TIA
The call operator (&) always uses a new scope. Instead, use the dot source (.) operator:
$ErrorActionPreference = "Stop"
function describe()
{
$aaaa = 0;
. before { $aaaa = 2; };
. after { $aaaa; }
}
function before( [scriptblock]$sb )
{
. $sb
}
function after( $sb )
{
. $sb
}
describe
Note the use of . function
to invoke the function in same scope as where `$aaaa is defined.
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