ADDING mocking script for pesterV5 DOCS

versioned_docs/version-v5/usage/mocking.mdx

@@ -151,6 +151,156 @@ Describe 'Mocking native commands' {
         Should -Invoke -CommandName 'curl' -Exactly -Times 1 -ParameterFilter { "$args" -match '--url https://google.com -I' }
     }
 }
+```
+
+### Mocking function in scriptblock
+Unfortunately, we don't have a straightforward way to mock a function inside a scriptblock, but we could use some workarounds to accomplish this.
+
+warning：Mocking may not work correctly in Pester versions below v5, so this function is only supported in Pester v5. In earlier versions, you cannot run the mock together with the script.
+
+
+
+```
+---t1.ps1---
+# base https://github.com/pester/Pester/issues/1069
+###  --- file t1.ps1
+param (
+    [Parameter(Mandatory)]
+    $Name
+)
+
+# our entry point function that holds 
+# all the stuff that should happen when 
+# we run this script
+function Main {
+    param (
+        [Parameter(Mandatory)]
+        $Name
+    )
+    Write-Host $PSCommandPath
+    Get-Greeting $Name
+}
+
+# internal function that writes greeting
+function Get-Greeting {
+    param ($Name) 
+
+    $text = Get-GreetingText 
+    $formattedGreetingText = $text -f $Name
+    Write-Host $formattedGreetingText
+    $formattedGreetingText
+}
+
+# another internal function that collaborates
+# with Get-Greeting and that we will mock 
+# in our tests
+function Get-GreetingText {
+    'Hello, {0}!'
+}
+
+Main -Name $Name
+---------------
+```
+
+```
+--t1.test.ps1--
+
+
+#warning :Mocking may not work correctly in Pester versions below v5, so this function is only supported in Pester v5. In earlier versions, you cannot run the mock together with the script.
+
+BeforeAll{
+
+    Add-Type -TypeDefinition @'
+using System.Collections.ObjectModel;
+using System.Management.Automation;
+using System.Reflection;
+
+namespace ScriptMocking
+{
+    [Cmdlet(VerbsData.Import, "Script")]
+    public sealed class ImportScriptCommand : PSCmdlet
+    {
+        private static string Body = @"
+            function ____placeholder {{ }}
+            # alias to prevent main from running
+            Set-Alias {0} '____placeholder'
+
+            . {1} {2}
+            # remove the alias, now we have all functions
+            # from the script dot-sourced in this scope
+            Remove-Item 'alias:{0}' -Force
+            Remove-Item 'function:____placeholder' -Force";
+
+        [Parameter(Position = 0, Mandatory = true)]
+        public string Path { get; set; }
+
+        [Parameter(Position = 1)]
+        public string EntryPoint { get; set; }
+
+        [Parameter]
+        public string[] ArgumentList { get; set; }
+
+        public ImportScriptCommand() {
+            ArgumentList = new string[0];
+            EntryPoint = "Main";
+        }
+        protected override void ProcessRecord()
+        {
+            var body =  string.Format(Body, EntryPoint, Path, string.Join(" ", ArgumentList));
+
+            var sb = InvokeCommand.NewScriptBlock(body);
+
+            var method = sb.GetType()
+                .GetMethod("InvokeUsingCmdlet", BindingFlags.Instance | BindingFlags.NonPublic);
+
+            var emptyArray = new object[0];
+            var automationNull = new PSObject();
+            const int writeToCurrentErrorPipe = 1;
+
+            var @params = new object[]
+                {this, false, writeToCurrentErrorPipe, automationNull, emptyArray, automationNull, new object[0]};
+
+            method.Invoke(sb, @params);
+        }
+    }
+}
+'@
+  Import-Module ([ScriptMocking.ImportScriptCommand].Assembly)
+Import-Script -Path "$psScriptRoot/t1.ps1" -EntryPoint 'Main' -ArgumentList '-Name Jakub'
+
+
+}
+Describe 'test scriptMocking'{
+
+Describe "t1.ps1" {
+    It "Can test 'Main' function" {
+        Main -Name 'Pester' | Should -Be 'Hello, Pester!'
+    }
+
+    It "Can test 'Get-Greeting' function" {
+        Get-Greeting -Name 'Pester' | Should -Be 'Hello, Pester!'
+    }
+
+    It "Can mock Get-GreetingText that is used by Get-GreetingFunction" {
+        Mock Get-GreetingText { '{0} is getting better at mocking!'  }
+        Get-Greeting -Name 'Pester' | Should -Be 'Pester is getting better at mocking!'
+    }
+}
+}
+<#
+output :
+Hello, Pester!
+Hello, Pester!
+Pester is getting better at mocking!
+[+] O:\OneDrive\script-tester\mockFunction.test.ps1 363ms (119ms|202ms)
+Tests completed in 370ms
+Tests Passed: 3, Failed: 0, Skipped: 0, Inconclusive: 0, NotRun: 0
+PS C:\Users\Administrator> Remove-Module -name pester -Force     
+#>
+
+
+
+
 ```
 
 ## $PesterBoundParameters
@@ -272,4 +422,3 @@ Describe "d" {
         Should -Invoke f -Exactly 0
     }
 }
-```