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https://github.com/nightroman/PowerShellTraps

Collection of PowerShell traps and oddities
https://github.com/nightroman/PowerShellTraps

issues powershell testing

Last synced: about 2 months ago
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Collection of PowerShell traps and oddities

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README 

        

[TESTS]: ./TESTS.md

[Invoke-PowerShell.ps1]: https://www.powershellgallery.com/packages/Invoke-PowerShell



*PowerShellTraps* is a collection of some PowerShell traps and oddities shown

by demo scripts, workarounds, and automated tests. On invoking scripts change

to their directory. See also [TESTS]. Some scripts require

[Invoke-PowerShell.ps1].



---



## Index



- [Basic](#basic)

- [Class](#class)

- [Clixml](#clixml)

- [Cmdlets](#cmdlets)

- [Module](#module)

- [PowerShell.exe](#powershellexe)



## Basic



- [Operators `-and` and `-or` have the same precedence](Basic/And-and-or-have-same-precedence)

- [Invoking native apps with error output](Basic/App-with-error-output)

- [Automatic variables as parameters or local variables](Basic/Automatic-variables)

- [Break and Continue with not matching label](Basic/Break-and-Continue-with-not-matching-label)

- [Break and Continue without loop](Basic/Break-and-Continue-without-loop)

- [Collection property enumeration](Basic/Collection-property-enumeration)

- [Comparison operators work differently with scalars and collections](Basic/Comparison-operators-with-collections)

- [Compound assignment operators](Basic/Compound-assignment-operators)

- Count-and-Length

    - [Mixed objects](Basic/Count-and-Length/Mixed-objects)

    - [`PSCustomObject` does not have surrogate `Count` and `Length`](Basic/Count-and-Length/PSCustomObject)

    - [`Count` and `Length` of a scalar fail in the strict mode](Basic/Count-and-Length/Strict-Mode)

- [Dictionary Count, Keys, Values may misbehave](Basic/Dictionary-Count-Keys-Values)

- [Different kinds of null](Basic/Different-kinds-of-null)

- [Double quoted strings and sub-expressions with double quotes](Basic/Double-quoted-string)

- DynamicParam

    - [Dynamic switch parameter](Basic/DynamicParam/Dynamic-switch-parameter)

    - [`$MyInvocation.ExpectingInput` is false in `DynamicParam`](Basic/DynamicParam/ExpectingInput-is-false)

- [Enums evaluated to true](Basic/Enums-evaluated-to-true)

- [Errors of unusual type](Basic/Errors-of-unusual-type)

- [FormatEnumerationLimit](Basic/FormatEnumerationLimit)

- [Function invoked like method](Basic/Function-invoked-like-method)

- [Invocation with odd paths](Basic/Invocation-with-odd-paths)

- [LastExitCode](Basic/LastExitCode)

- [Local action preference variables](Basic/Local-ActionPreference)

- [Misleading error location](Basic/Misleading-error-location)

- [Missing ternary operator](Basic/Missing-ternary-operator)

- [Negative number literal argument](Basic/Negative-number-literal-argument)

- [Null converted to empty string](Basic/Null-converted-to-empty-string)

- [Number of returned objects](Basic/Number-of-returned-objects)

- [Operators `-match`, `-notmatch` do not reset `$matches`](Basic/Operators-match-notmatch-and-matches)

- [Counter-intuitive equal precedence of some operators](Basic/Operators-with-equal-precedence)

- [Tricky properties of types implementing IDictionary](Basic/Properties-of-IDictionary)

- [Properties of XML nodes](Basic/Properties-of-XmlNode)

- [Provider specific filters](Basic/Provider-specific-Filter)

- [PSCustomObject](Basic/PSCustomObject)

- [`[ref]` may be unwrapped unexpectedly](Basic/PSReference)

- [Directive `#requires`](Basic/Requires)

- [Runspace pool memory leaks with `Close()`](Basic/RunspacePool)

- [Statements are not expressions](Basic/Statements-are-not-expressions)

- [ErrorRecord formatting may fail in the strict mode in the default host](Basic/Strict-mode-ErrorRecord-formatting)

- [String constructor](Basic/String-constructor)

- [String equality operators](Basic/String-equality-operators)

- [`switch` is a looping construct](Basic/Switch-is-a-looping-construct)

- [Tempting wrong operators](Basic/Tempting-wrong-operators)

- [`Throw` may not terminate](Basic/Throw-may-not-terminate)

- ThrowTerminatingError

    - [`ThrowTerminatingError` does not trigger the immediate catch](Basic/ThrowTerminatingError/Catch-is-not-called)

    - [`ThrowTerminatingError` produces not true terminating errors](Basic/ThrowTerminatingError/Not-true-terminating)

- [Too simple function names](Basic/Too-simple-function-names)

- [`trap` creates a new scope](Basic/Trap-creates-a-new-scope)

- [`trap` with `continue`](Basic/Trap-with-continue)

- [`trap` with no `break` or `continue`](Basic/Trap-with-no-break-or-continue)

- [`try` and `trap` catch terminating errors](Basic/Try-and-trap-catch-terminating-errors)

- [Unexpected output](Basic/Unexpected-output)

- [Unexpected overloaded method](Basic/Unexpected-overloaded-method)

- [Unrolled collections](Basic/Unrolled-collections)

- [v5 method `new()`](Basic/v5-Method-New)

- [`ValidateScript` and cryptic error messages](Basic/ValidateScript-attribute)

- [ValueFromPipeline used for several parameters](Basic/ValueFromPipeline)

- [Parameters with ValueFromRemainingArguments](Basic/ValueFromRemainingArguments)

- [When `process` block is called](Basic/When-Process-block-is-called)

- [`WildcardPattern.Escape()` does not escape some backticks](Basic/WildcardPattern)



## Class



- [Attribute with later defined type parameter](Class/Attribute-with-later-defined-type-parameter)

- [Cannot derive a class from another defined later](Class/Cannot-derive-from-defined-later)

- [Cannot derive from dot sourced](Class/Cannot-derive-from-dot-sourced)

- [Identical script blocks issue](Class/Identical-scriptblocks-issue)

- [Methods do not see implicitly created variables](Class/Method-cannot-see-created-variable)

- [Parser fails on custom type](Class/Parser-fails-on-custom-type)



## Clixml



- [Cannot write to hidden files](Clixml/Cannot-write-to-hidden-files)

- [Hashtable case sensitivity](Clixml/Hashtable-case-sensitivity)

- [`OrderedDictionary` becomes `Hashtable`](Clixml/OrderedDictionary-becomes-Hashtable)

- [`ScriptBlock` becomes `String`](Clixml/ScriptBlock-becomes-String)

- [No `LiteralPath` in v2](Clixml/v2-no-LiteralPath)



## Cmdlets



- ConvertFrom-Csv

    - [`ConvertFrom-Csv` has undocumented partial comment support](Cmdlets/ConvertFrom-Csv/Partial-comment-support)

- ConvertFrom-Json

    - [`ConvertFrom-Json` returns an array not unrolled](Cmdlets/ConvertFrom-Json/Not-unrolled-result)

    - [`ConvertFrom-Json` pipeline input](Cmdlets/ConvertFrom-Json/Piping-content)

    - [`ConvertFrom-Json` long integers in v6](Cmdlets/ConvertFrom-Json/v6-long-integers)

- ConvertTo-Json

    - [`ConvertTo-Json` Array as PSObject](Cmdlets/ConvertTo-Json/Array-as-PSObject)

    - [`ConvertTo-Json` without `Compress` may change data](Cmdlets/ConvertTo-Json/v3-Without-Compress)

- Copy-Item

    - [`Copy-Item` - `Exclude` is ignored with `Recurse`](Cmdlets/Copy-Item/Exclude-and-Recurse)

    - [`Copy-Item` inconsistent destination directory](Cmdlets/Copy-Item/Inconsistent-destination)

- [`ForEach-Object`](Cmdlets/ForEach-Object)

- Get-ChildItem

    - [`Get-ChildItem` gets items converted to strings differently](Cmdlets/Get-ChildItem/Different-FileInfo-ToString)

    - [`Get-ChildItem` wildcard-path fails in a directory with backticks](Cmdlets/Get-ChildItem/Directory-with-backticks)

    - [`Get-ChildItem -LiteralPath -Recurse` gets nothing for a directory with brackets](Cmdlets/Get-ChildItem/Directory-with-brackets)

    - [`Get-ChildItem -Recurse` and missing `-Path` unexpected search](Cmdlets/Get-ChildItem/Missing-path-and-Recurse)

    - [`Get-ChildItem -LiteralPath -Recurse` ignores `-Include`](Cmdlets/Get-ChildItem/v5-LiteralPath-Recurse-ignores-Include)

- Get-Event

    - [`Get-Event` erratic failures in v2-4](Cmdlets/Get-Event/v2-4-Erratic-failure)

- Get-Item

    - [`Get-Item` fails to get `Cert:`](Cmdlets/Get-Item/Certificate-provider)

    - [`Get-Item` works incorrectly in some locations](Cmdlets/Get-Item/Directory-with-brackets)

- Get-ItemPropertyValue

    - [`Get-ItemPropertyValue` ignores `ErrorAction`](Cmdlets/Get-ItemPropertyValue/ErrorAction-ignored)

- [`Get-Unique` oddities](Cmdlets/Get-Unique)

- Get-WmiObject

    - [`Get-WmiObject` - amended WMI data may fail in the strict mode `Latest`](Cmdlets/Get-WmiObject/Strict-mode-Latest)

- Group-Object

    - [`Group-Object -AsHashTable` and custom expressions](Cmdlets/Group-Object/AsHashTable)

    - [`Group-Object` and properties made by expressions with no values](Cmdlets/Group-Object/Expression-with-no-value)

- [`Import-Csv` may trim leading spaces](Cmdlets/Import-Csv)

- Import-Module

    - [`Import-Module` non-terminating error](Cmdlets/Import-Module/Non-terminating-error)

- Invoke-Expression

    - [`Invoke-Expression` `ErrorAction` is ignored in favour of `$ErrorActionPreference`](Cmdlets/Invoke-Expression/ErrorAction)

- Invoke-RestMethod

    - [`Invoke-RestMethod` returns an array not unrolled](Cmdlets/Invoke-RestMethod/Not-unrolled-result)

- [`Join-Path` fails if the path drive does not exist](Cmdlets/Join-Path)

- Read-Host

    - [v5 output before `Read-Host`](Cmdlets/Read-Host/v5-Output-before-Read-Host)

- Remove-Item

    - [`Remove-Item -LiteralPath` fails in a directory with brackets](Cmdlets/Remove-Item/Directory-with-brackets)

    - [`Remove-Item` may ignore items specified by `Exclude`](Cmdlets/Remove-Item/Exclude-may-be-ignored)

- [`Remove-ItemProperty -Confirm` fails on 'No' (Registry)](Cmdlets/Remove-ItemProperty)

- Rename-Item

    - [`Rename-Item` has no `LiteralPath` in v2](Cmdlets/Rename-Item/v2-no-LiteralPath)

- Resolve-Path

    - [`Resolve-Path -Path` with wildcards misses hidden items](Cmdlets/Resolve-Path/Wildcards-miss-hidden-items)

- Select-Xml

    - [`Select-Xml -Content` does not support input as stream](Cmdlets/Select-Xml/Content-as-stream)

- Set-Content

    - [`Set-Content` fails in a directory with brackets](Cmdlets/Set-Content/Directory-with-brackets)

    - [`Set-Content` unexpected output location](Cmdlets/Set-Content/Unexpected-output-location)

- [`Split-Path` with UNC paths: mind the current provider](Cmdlets/Split-Path)

- [`Start-Process`](Cmdlets/Start-Process)

- Test-Path

    - [`Test-Path` oddities](Cmdlets/Test-Path/Incorrect-in-odd-location)

    - [`Test-Path -Path` with wildcards misses hidden items](Cmdlets/Test-Path/Wildcards-miss-hidden-items)

- [`Wait-Process` fails if a process name is not found](Cmdlets/Wait-Process)

- [`Where-Object`](Cmdlets/Where-Object)

- [`Write-Debug`](Cmdlets/Write-Debug)

- [`Write-Progress`](Cmdlets/Write-Progress)



## Module



- [Conflict with aliases](Module/Conflict-with-aliases)

- [Function parent scope](Module/Function-parent-scope)

- [Not found function](Module/Not-found-function)

- [Not found function (part 2)](Module/Not-found-function-2)

- [Not found variable](Module/Not-found-variable)

- [Script block scope](Module/Script-block-scope)

- [How to set a variable in the caller scope](Module/Set-variable-in-caller-scope)

- [Strict mode is not propagated](Module/Strict-mode-is-not-propagated)

- [v2 does not support the manifest field `RootModule`](Module/v2-Manifest-RootModule-is-not-supported)



## PowerShell.exe



- [Exit code 0 with Command syntax error](PowerShell.exe/Exit-code-0-with-Command-syntax-error)

- [Exit code 0 with File script error](PowerShell.exe/Exit-code-0-with-File-script-error)

- [Exit code 5 with File, 1 with Command](PowerShell.exe/Exit-code-5-with-File-1-with-Command)

- [Exit code depends](PowerShell.exe/Exit-code-depends)

- [Global and script scope](PowerShell.exe/Global-and-script-scope)

- [Not current version](PowerShell.exe/Not-current-version)

- [Different positional parameters in powershell and pwsh](PowerShell.exe/Positional-Command-File)

- [Switch parameter with value](PowerShell.exe/Switch-parameter-with-value)

- [Unexpected start location](PowerShell.exe/Unexpected-start-location)

- [v3 interactive issues](PowerShell.exe/v3-Interactive-issues)

- [Parameter `Version` must be the first.](PowerShell.exe/Version-parameter)

- [`Version` and scriptblock host problem](PowerShell.exe/Version-scriptblock-host-problem)



---