refactor(tests): bootstrap remaining standalone tests via build.ps1

Apply the delegate-to-build.ps1 bootstrap from #38 to the rest of the
test scaffolds: tests/Manifest.tests.ps1 (both BeforeDiscovery and
BeforeAll) and the tests/Unit/ Private and Public templates. These
previously called Invoke-psake against build.psake.ps1 directly without
populating the BuildHelpers env vars its properties block needs, so the
standalone path was broken the same way Help.tests.ps1 was.

Each guard now calls build.ps1 -Task 'Build' -Bootstrap via the call
operator (&), so dependency bootstrap and BuildHelpers environment setup
run through the canonical entry point and the script's terminating exit
is contained to the script boundary instead of ending the Pester run.

Project root is resolved with Split-Path -Parent (one level for
Manifest.tests.ps1, three for the tests/Unit/ files, matching each
file's existing root computation) and a single two-argument Join-Path,
keeping it valid on PowerShell 5.1.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: tablackburn

CHANGELOG.md

@@ -20,6 +20,7 @@ own `CHANGELOG.md` (generated from `CHANGELOG.template.md` during init).
 
 - Renamed required PowerShell Gallery publish secret `PS_GALLERY_KEY` → `PSGALLERY_API_KEY` so the secret name matches the env var name PowerShellBuild reads (eliminating the previous mapping caveat). New modules created from the template after this change pick up the new name automatically. **Migration for existing modules:** create a new `PSGALLERY_API_KEY` repo secret with the same value, update `.github/workflows/PublishModuleToPowerShellGallery.yaml` to reference `secrets.PSGALLERY_API_KEY`, then delete the old `PS_GALLERY_KEY` secret.
 - Test scaffolding (`tests/Help.tests.ps1`, `tests/Manifest.tests.ps1`, `tests/Meta.tests.ps1`, `tests/MetaFixers.psm1`, and the `tests/Unit/` templates) no longer names parameters on single-argument calls (e.g. `Test-Path $path`, `Get-Module $name`, `Get-Help $command`), matching the scoped named-parameter rule — name parameters only when a call passes two or more arguments. A trailing switch counts as an argument, so `Split-Path -Path $x -Parent`, `Get-Content -Path $x -Raw`, and `Get-ChildItem -Path $x -Recurse` keep their names, as do genuinely multi-value calls (`Join-Path`, `Get-Command -Name … -CommandType …`) and `Test-Path -LiteralPath`.
+- `tests/Manifest.tests.ps1` and the `tests/Unit/` templates now use the same standalone build-bootstrap approach introduced for `tests/Help.tests.ps1` (#38): their `BHBuildOutput`-missing guards delegate to `build.ps1 -Task 'Build' -Bootstrap` (invoked with `&`, not dot-sourced, so its terminating `exit` is contained) instead of calling `Invoke-psake` against `build.psake.ps1` directly. This routes dependency bootstrap and BuildHelpers environment setup through the canonical entry point, so these tests can be run standalone (e.g. from an editor or by an agent) without first running `./build.ps1`. No effect on CI or `./build.ps1` runs — the guard only fires when `BHBuildOutput` is unset.
 
 ## [2026.04.29] - 2026-04-29
 

tests/Manifest.tests.ps1

@@ -60,12 +60,15 @@ BeforeDiscovery {
     # Check if the BHBuildOutput environment variable exists to determine if this test is running in a psake
     # build or not. If it does not exist, it is not running in a psake build, so build the module.
     if ($null -eq $Env:BHBuildOutput) {
-        $buildFilePath = Join-Path -Path $PSScriptRoot -ChildPath '..\build.psake.ps1'
-        $invokePsakeParameters = @{
-            TaskList  = 'Build'
-            BuildFile = $buildFilePath
-        }
-        Invoke-psake @invokePsakeParameters
+        # Standalone run (e.g. Invoke-Pester on this file directly, or an agent
+        # running one test): the module isn't built and the BuildHelpers env vars
+        # aren't set. Defer to build.ps1 -- the canonical entry point -- to bootstrap
+        # dependencies, set the BuildHelpers environment, and stage the module.
+        # Invoke with & (not dot-sourcing): build.ps1 ends in an exit statement, and
+        # the call operator contains it to the script boundary instead of ending the
+        # whole Pester run.
+        $buildScript = Join-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -ChildPath 'build.ps1'
+        & $buildScript -Task 'Build' -Bootstrap
     }
 
     # PowerShellBuild outputs to Output/<ModuleName>/<Version>/, override BHBuildOutput
@@ -99,12 +102,15 @@ BeforeAll {
     # Check if the BHBuildOutput environment variable exists to determine if this test is running in a psake
     # build or not. If it does not exist, it is not running in a psake build, so build the module.
     if ($null -eq $Env:BHBuildOutput) {
-        $buildFilePath = Join-Path -Path $PSScriptRoot -ChildPath '..\build.psake.ps1'
-        $invokePsakeParameters = @{
-            TaskList  = 'Build'
-            BuildFile = $buildFilePath
-        }
-        Invoke-psake @invokePsakeParameters
+        # Standalone run (e.g. Invoke-Pester on this file directly, or an agent
+        # running one test): the module isn't built and the BuildHelpers env vars
+        # aren't set. Defer to build.ps1 -- the canonical entry point -- to bootstrap
+        # dependencies, set the BuildHelpers environment, and stage the module.
+        # Invoke with & (not dot-sourcing): build.ps1 ends in an exit statement, and
+        # the call operator contains it to the script boundary instead of ending the
+        # whole Pester run.
+        $buildScript = Join-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -ChildPath 'build.ps1'
+        & $buildScript -Task 'Build' -Bootstrap
     }
 
     # PowerShellBuild outputs to Output/<ModuleName>/<Version>/, override BHBuildOutput

tests/Unit/Private/Invoke-{{Prefix}}Helper.tests.ps1

@@ -8,12 +8,15 @@ param()
 BeforeDiscovery {
     # Build module if not running in psake build
     if ($null -eq $Env:BHBuildOutput) {
-        $buildFilePath = Join-Path -Path $PSScriptRoot -ChildPath '..\..\..\build.psake.ps1'
-        $invokePsakeParameters = @{
-            TaskList  = 'Build'
-            BuildFile = $buildFilePath
-        }
-        Invoke-psake @invokePsakeParameters
+        # Standalone run (e.g. Invoke-Pester on this file directly, or an agent
+        # running one test): the module isn't built and the BuildHelpers env vars
+        # aren't set. Defer to build.ps1 -- the canonical entry point -- to bootstrap
+        # dependencies, set the BuildHelpers environment, and stage the module.
+        # Invoke with & (not dot-sourcing): build.ps1 ends in an exit statement, and
+        # the call operator contains it to the script boundary instead of ending the
+        # whole Pester run.
+        $buildScript = Join-Path -Path (Split-Path -Path (Split-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -Parent) -Parent) -ChildPath 'build.ps1'
+        & $buildScript -Task 'Build' -Bootstrap
     }
 
     # PowerShellBuild outputs to Output/<ModuleName>/<Version>/

tests/Unit/Public/Get-{{Prefix}}Example.tests.ps1

@@ -8,12 +8,15 @@ param()
 BeforeDiscovery {
     # Build module if not running in psake build
     if ($null -eq $Env:BHBuildOutput) {
-        $buildFilePath = Join-Path -Path $PSScriptRoot -ChildPath '..\..\..\build.psake.ps1'
-        $invokePsakeParameters = @{
-            TaskList  = 'Build'
-            BuildFile = $buildFilePath
-        }
-        Invoke-psake @invokePsakeParameters
+        # Standalone run (e.g. Invoke-Pester on this file directly, or an agent
+        # running one test): the module isn't built and the BuildHelpers env vars
+        # aren't set. Defer to build.ps1 -- the canonical entry point -- to bootstrap
+        # dependencies, set the BuildHelpers environment, and stage the module.
+        # Invoke with & (not dot-sourcing): build.ps1 ends in an exit statement, and
+        # the call operator contains it to the script boundary instead of ending the
+        # whole Pester run.
+        $buildScript = Join-Path -Path (Split-Path -Path (Split-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -Parent) -Parent) -ChildPath 'build.ps1'
+        & $buildScript -Task 'Build' -Bootstrap
     }
 
     # PowerShellBuild outputs to Output/<ModuleName>/<Version>/