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@@ -166,7 +166,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-instructions) for guidelines on
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| [Power Platform Connectors Schema Development Instructions](../instructions/power-platform-connector.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpower-platform-connector.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpower-platform-connector.instructions.md) | Comprehensive development guidelines for Power Platform Custom Connectors using JSON Schema definitions. Covers API definitions (Swagger 2.0), API properties, and settings configuration with Microsoft extensions. |
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| [Power Platform MCP Custom Connector Development](../instructions/power-platform-mcp-development.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpower-platform-mcp-development.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpower-platform-mcp-development.instructions.md) | Instructions for developing Power Platform custom connectors with Model Context Protocol (MCP) integration for Microsoft Copilot Studio |
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| [PowerShell Cmdlet Development Guidelines](../instructions/powershell.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell.instructions.md) | PowerShell cmdlet and scripting best practices based on Microsoft guidelines |
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| [PowerShell Pester v5 Testing Guidelines](../instructions/powershell-pester-5.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell-pester-5.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell-pester-5.instructions.md) | PowerShell Pester testing best practices based on Pester v5 conventions |
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| [PowerShell Pester v6 Testing Guidelines](../instructions/powershell-pester-6.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell-pester-6.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell-pester-6.instructions.md) | PowerShell Pester testing best practices based on Pester v6 conventions |
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| [Project Context](../instructions/moodle.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fmoodle.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fmoodle.instructions.md) | Instructions for GitHub Copilot to generate code in a Moodle project context. |
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| [Python MCP Server Development](../instructions/python-mcp-server.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpython-mcp-server.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpython-mcp-server.instructions.md) | Instructions for building Model Context Protocol (MCP) servers using the Python SDK |
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| [QA Engineering Best Practices](../instructions/qa-engineering-best-practices.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fqa-engineering-best-practices.instructions.md)<br />[](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fqa-engineering-best-practices.instructions.md) | Comprehensive QA engineering best practices covering test strategy, test pyramid, naming conventions, assertion patterns, bug reporting, and automation guidelines for modern software projects. |
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+39
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---
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applyTo: '**/*.Tests.ps1'
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description: 'PowerShell Pester testing best practices based on Pester v5 conventions'
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description: 'PowerShell Pester testing best practices based on Pester v6 conventions'
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---
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# PowerShell Pester v5 Testing Guidelines
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# PowerShell Pester v6 Testing Guidelines
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This guide provides PowerShell-specific instructions for creating automated tests using PowerShell Pester v5 module. Follow PowerShell cmdlet development guidelines in [powershell.instructions.md](./powershell.instructions.md) for general PowerShell scripting best practices.
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This guide provides PowerShell-specific instructions for creating automated tests with the PowerShell Pester v6 module. Pester v6 runs on Windows PowerShell 5.1 and PowerShell 7.4+. Follow the general PowerShell scripting guidance in [powershell.instructions.md](./powershell.instructions.md).
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Pester v6 is largely compatible with v5, but it makes several previously deprecated behaviours fail fast. Keep each test file self-contained and run the suite with the same PowerShell and Pester versions used by CI.
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## File Naming and Structure
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@@ -27,12 +29,33 @@ Describe 'FunctionName' {
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}
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```
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## Discovery and Run
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- Pester v6 discovers and runs one file at a time. Do not rely on discovery-time side effects from another test file (for example, a global variable, current directory, or imported module).
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- Use `BeforeDiscovery` for data needed to construct tests and `BeforeAll` to import modules or initialise runtime state for the file.
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- Keep every test file independently runnable; place shared setup in a Pester configuration (`Run.BeforeContainer`) or a repository `Pester.BeforeContainer.ps1` when it truly applies to all files.
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```powershell
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BeforeDiscovery {
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$cases = Get-Content "$PSScriptRoot/cases.json" | ConvertFrom-Json
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}
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BeforeAll {
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Import-Module "$PSScriptRoot/MyModule.psm1"
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}
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Describe 'MyModule' {
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It 'handles <Name>' -ForEach $cases { Invoke-Thing $Name | Should -Be 'ok' }
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}
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```
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## Core Keywords
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- **`Describe`**: Top-level grouping, typically named after function being tested
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- **`Context`**: Sub-grouping within Describe for specific scenarios
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- **`It`**: Individual test cases, use descriptive names
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- **`Should`**: Assertion keyword for test validation
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- **`Should`**: Classic assertion command (`Should -Be`, `Should -Throw`, etc.); existing v5 syntax remains supported
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- **`Should-*`**: New v6 assertion commands (`Should-Be`, `Should-Throw`, etc.); adopt them deliberately, not as a required rename
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- **`BeforeAll/AfterAll`**: Setup/teardown once per block
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- **`BeforeEach/AfterEach`**: Setup/teardown before/after each test
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@@ -42,7 +65,8 @@ Describe 'FunctionName' {
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- **`BeforeEach`**: Runs before every `It` in block, use for test-specific setup
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- **`AfterEach`**: Runs after every `It`, guaranteed even if test fails
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- **`AfterAll`**: Runs once at end of block, use for cleanup
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- **Variable Scoping**: `BeforeAll` variables available to child blocks (read-only), `BeforeEach/It/AfterEach` share same scope
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- **Variable Scoping**: `BeforeAll` variables are available to child blocks (read-only); `BeforeEach`, `It`, and `AfterEach` share their block scope
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- **One hook of each type**: A block may contain only one `BeforeAll`, `BeforeEach`, `AfterAll`, or `AfterEach`; combine setup when necessary
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## Assertions (Should)
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@@ -63,6 +87,8 @@ Describe 'FunctionName' {
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- **`Should -InvokeVerifiable`**: Verify all verifiable mocks were called
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- **Scope**: Mocks default to containing block scope
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Pester v6 removes `Assert-MockCalled` and `Assert-VerifiableMock`; replace them with the `Should -Invoke` forms. Calls that miss every `-ParameterFilter` no longer fall through to the real command, so add a default mock whenever unmatched calls are valid.
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```powershell
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Mock Get-Service { @{ Status = 'Running' } } -ParameterFilter { $Name -eq 'TestService' }
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Should -Invoke Get-Service -Exactly 1 -ParameterFilter { $Name -eq 'TestService' }
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@@ -70,7 +96,7 @@ Should -Invoke Get-Service -Exactly 1 -ParameterFilter { $Name -eq 'TestService'
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## Test Cases (Data-Driven Tests)
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Use `-TestCases` or `-ForEach` for parameterized tests:
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Use `-TestCases` or `-ForEach` for parameterized tests. In Pester v6, `$null` or an empty array throws instead of silently skipping; fix the data source or opt in to an empty case with `-AllowNullOrEmptyForEach` on the specific block.
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```powershell
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It 'Should return <Expected> for <Input>' -TestCases @(
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@@ -100,10 +126,12 @@ It 'Returns <Expected> for <Name>' -ForEach @(
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It 'Contains <_>' -ForEach 'item1', 'item2' { Get-Collection | Should -Contain $_ }
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```
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When a test name contains `<...>`, Pester v6 evaluates the token as a PowerShell expression. Backtick-escape the opening `<` when the text should remain literal.
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## Tags
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- **Available on**: `Describe`, `Context`, and `It` blocks
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- **Filtering**: Use `-TagFilter` and `-ExcludeTagFilter` with `Invoke-Pester`
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- **Filtering**: Use `-Tag` and `-ExcludeTag` with `Invoke-Pester`, or set `Filter.Tag` and `Filter.ExcludeTag` in `New-PesterConfiguration`
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- **Wildcards**: Tags support `-like` wildcards for flexible filtering
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```powershell
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@@ -113,14 +141,14 @@ Describe 'Function' -Tag 'Unit' {
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}
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# Run only fast unit tests
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Invoke-Pester -TagFilter 'Unit' -ExcludeTagFilter 'Slow'
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Invoke-Pester -Tag 'Unit' -ExcludeTag 'Slow'
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```
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## Skip
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- **`-Skip`**: Available on `Describe`, `Context`, and `It` to skip tests
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- **Conditional**: Use `-Skip:$condition` for dynamic skipping
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- **Runtime Skip**: Use `Set-ItResult -Skipped` during test execution (setup/teardown still run)
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- **Runtime Skip**: Use `Set-ItResult -Skipped` or `Set-ItResult -Inconclusive` during test execution (setup/teardown still run)
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- **Ends the test body**: `Set-ItResult -Skipped`/`-Inconclusive` throws internally to end the `It` block, so code after it does not run; a trailing `return` is unreachable and should not be added
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```powershell
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@@ -133,6 +161,7 @@ Context 'Integration tests' -Skip { }
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- **Continue on Failure**: Use `Should.ErrorAction = 'Continue'` to collect multiple failures
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- **Stop on Critical**: Use `-ErrorAction Stop` for pre-conditions
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- **Test Exceptions**: Use `{ Code } | Should -Throw` for exception testing
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- **Pending tests**: `Set-ItResult -Pending` was removed; use `-Inconclusive`, `-Skipped`, or `It -Skip`
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## Best Practices
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@@ -185,7 +214,7 @@ Describe 'Get-UserInfo' {
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Configuration is defined **outside** test files when calling `Invoke-Pester` to control execution behavior.
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```powershell
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# Create configuration (Pester 5.2+)
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# Create configuration (Pester v6)
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$config = New-PesterConfiguration
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$config.Run.Path = './Tests'
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$config.Output.Verbosity = 'Detailed'
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