diff --git a/src/pester-tests/Get-Event.Tests.ps1 b/src/pester-tests/Get-Event.Tests.ps1
new file mode 100644
index 0000000000..5eee63bba3
--- /dev/null
+++ b/src/pester-tests/Get-Event.Tests.ps1
@@ -0,0 +1,33 @@
+Describe "Get-Event" {
+
+    BeforeEach {
+        ( New-Event -SourceIdentifier PesterTestEvent -sender windows.timer -messagedata "PesterTestMessage" )
+     }
+
+    AfterEach {
+        ( Remove-Event -SourceIdentifier PesterTestEvent -ErrorAction SilentlyContinue )
+    }
+    
+    Context "Check return type of Get-Event" {
+	
+        It "Should return PSEventArgs as return type of Get-Event" {	    
+            { ( Get-Event -SourceIdentifier PesterTestEvent ).GetType() | Should Be System.Management.Automation.PSEventArgs }
+	}
+    }
+
+    Context "Validate Get-Event can retrieve event" {
+
+	It "Should return at least 1 event" {
+	    { (Get-Event).Count | Should BeGreaterThan 0 }
+	}
+	
+	It "Should return PesterTestMessage as the MessageData" {
+	    { (Get-Event -SourceIdentifier PesterTimer).MessageData  | Should Be "PesterTestMessage" }
+	}
+
+        It "Should return Sender as windows.timer" {
+	     { (Get-Event -SourceIdentifier PesterTimer).Sender  | Should be windows.timer }
+	}
+    
+    }
+}
diff --git a/src/pester-tests/Get-RunspaceDebug.Tests.ps1 b/src/pester-tests/Get-RunspaceDebug.Tests.ps1
new file mode 100644
index 0000000000..7c66ed7363
--- /dev/null
+++ b/src/pester-tests/Get-RunspaceDebug.Tests.ps1
@@ -0,0 +1,9 @@
+Describe "Get-RunspaceDebug" {
+
+    Context "Check return types of RunspaceDebug" {
+
+        It "Should return Microsoft.Powershell.Commands.PSRunspaceDebug as the return type" {
+            (Get-RunspaceDebug).GetType() | Should Be Microsoft.Powershell.Commands.PSRunspaceDebug
+        }    
+    }
+}
diff --git a/src/pester-tests/Import-Alias.Tests.ps1 b/src/pester-tests/Import-Alias.Tests.ps1
new file mode 100644
index 0000000000..9520146877
--- /dev/null
+++ b/src/pester-tests/Import-Alias.Tests.ps1
@@ -0,0 +1,27 @@
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+
+Describe "Import-Alias" {
+    $pesteraliasfile = "$here/assets/pesteralias.txt"
+    
+    Context "Validate ability to import alias file" {
+
+	It "Should be able to import an alias file successfully" {
+	    { Import-Alias $pesteraliasfile } | Should Not throw
+	}
+
+	It "Should be able to import file via the Import-Alias alias of ipal" {
+            { ipal $pesteraliasfile } | Should Not throw
+        }
+
+        It "Should be able to import an alias file and perform imported aliased echo cmd" {
+	    (Import-Alias $pesteraliasfile)
+	    (pesterecho pestertesting) | Should Be "pestertesting"
+	}
+
+        It "Should be able to use ipal alias to import an alias file and perform cmd" {
+            (ipal $pesteraliasfile)
+	    (pesterecho pestertesting) | Should be "pestertesting"
+	}
+        
+    }
+}
diff --git a/src/pester-tests/Invoke-Expression.Tests.ps1 b/src/pester-tests/Invoke-Expression.Tests.ps1
new file mode 100644
index 0000000000..6606eaed75
--- /dev/null
+++ b/src/pester-tests/Invoke-Expression.Tests.ps1
@@ -0,0 +1,31 @@
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+
+Describe "Invoke-Expression" {
+    
+    Context "Should execute the invoked command validly" {
+
+        It "Should return the echoed text" {
+            (Invoke-Expression -command "echo pestertest1") | Should be "pestertest1"
+        }
+
+        It "Should return the echoed text for the alias" {
+            (iex -command "echo pestertest2") | Should Be "pestertest2" 
+        }
+
+        It "Should return the echoed text from a script" {
+            $testfile = "$here/assets/echoscript.ps1"
+            $testcommand = "echo pestertestscript"
+            $testcommand | Add-Content -Path $testfile
+            (Invoke-Expression $testfile) | Should Be "pestertestscript"
+            Remove-Item $testfile
+        }
+
+        It "Should return the echoed text from a script from the alias" {
+            $testfile = "$here/assets/echoscript.ps1"
+            $testcommand = "echo pestertestscript"
+            $testcommand | Add-Content -Path $testfile
+            (iex $testfile) | Should Be "pestertestscript"
+            Remove-Item $testfile
+        }
+    }
+}
diff --git a/src/pester-tests/Measure-Command.Tests.ps1 b/src/pester-tests/Measure-Command.Tests.ps1
new file mode 100644
index 0000000000..16690a1440
--- /dev/null
+++ b/src/pester-tests/Measure-Command.Tests.ps1
@@ -0,0 +1,28 @@
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+
+Describe "Measure-Command" {
+
+    Context "Validate return types for Measure-Command" {
+
+        It "Should return TimeSpan as the return type" {
+            (Measure-Command { Get-Date }).GetType() | Should Be timespan
+        }
+    }
+
+    Context "Validate that it is executing commands correctly" {
+
+        It "Should return TimeSpan after executing a script" {
+            (Measure-Command { echo hi }).GetType() | Should Be timespan
+        }
+
+        It "Should return TimeSpan after executing a cmdlet" {
+            $pesterscript = "$here/assets/echoscript.ps1"
+            $testfile = "$here/assets/echoscript.ps1"
+            $testcommand = "echo pestertestscript"
+            $testcommand | Add-Content -Path $testfile
+
+            (Measure-Command { $pesterscript }).GetType() | Should Be timespan
+            Remove-Item $testfile
+        }
+    }
+}
diff --git a/src/pester-tests/Register-EngineEvent.Tests.ps1 b/src/pester-tests/Register-EngineEvent.Tests.ps1
new file mode 100644
index 0000000000..bf5a2b935e
--- /dev/null
+++ b/src/pester-tests/Register-EngineEvent.Tests.ps1
@@ -0,0 +1,9 @@
+Describe "Register-EngineEvent" {
+
+    Context "Check return type of Register-ObjectEvent" {	
+        It "Should return System.Management.Automation.PSEventJob as return type of Register-EngineEvent" {
+	   ( Register-EngineEvent -SourceIdentifier PesterTestRegister -Action {echo registerengineevent} ).GetType() | Should Be System.Management.Automation.PSEventJob
+           Unregister-Event -sourceidentifier PesterTestRegister
+	}
+    }
+}
diff --git a/src/pester-tests/Register-ObjectEvent.Tests.ps1 b/src/pester-tests/Register-ObjectEvent.Tests.ps1
new file mode 100644
index 0000000000..0e8d5c8035
--- /dev/null
+++ b/src/pester-tests/Register-ObjectEvent.Tests.ps1
@@ -0,0 +1,31 @@
+Describe "Register-ObjectEvent" {
+
+    BeforeEach {
+	    $pesterobject = (New-Object System.Collections.ObjectModel.ObservableCollection[object])
+	}
+    
+        AfterEach {
+            Unregister-Event -SourceIdentifier PesterTestRegister -ErrorAction SilentlyContinue
+        }
+
+    Context "Check return type of Register-ObjectEvent" {
+	
+        It "Should return System.Management.Automation.PSEventSubscriber as return type of New-Event with the registered sourceidentifier" {
+	    Register-ObjectEvent -InputObject $pesterobject -EventName CollectionChanged -SourceIdentifier PesterTestRegister
+	    (Get-EventSubscriber -SourceIdentifier PesterTestRegister).GetType() | Should Be System.Management.Automation.PSEventSubscriber
+	}
+    }
+
+    Context "Check Register-ObjectEvent can validly register events"{
+	It "Should return source identifier of PesterTimer " {
+	    Register-ObjectEvent -InputObject $pesterobject -EventName CollectionChanged -SourceIdentifier PesterTestRegister
+	    (Get-EventSubscriber -SourceIdentifier PesterTestRegister).SourceIdentifier | Should Be "PesterTestRegister"
+	}
+
+        It "Should return an integer greater than 0 for the SubscriptionId" {
+	    Register-ObjectEvent -InputObject $pesterobject -EventName CollectionChanged -SourceIdentifier PesterTestRegister
+	    (Get-EventSubscriber -SourceIdentifier PesterTestRegister).SubscriptionId | Should BeGreaterThan 0
+
+	}
+    }
+}
diff --git a/src/pester-tests/Remove-Event.Tests.ps1 b/src/pester-tests/Remove-Event.Tests.ps1
new file mode 100644
index 0000000000..cd44741e8a
--- /dev/null
+++ b/src/pester-tests/Remove-Event.Tests.ps1
@@ -0,0 +1,38 @@
+Describe "Remove-Event" {
+
+    BeforeEach{
+	    New-Event -sourceidentifier PesterTimer  -sender windows.timer -messagedata "PesterTestMessage" 
+    }
+
+    AfterEach{
+            Remove-Event -sourceidentifier PesterTimer -ErrorAction SilentlyContinue 
+     }
+    
+    Context "Check Remove-Event can validly remove events" {
+
+        It "Should remove an event given a sourceidentifier" {
+	    { Remove-Event -sourceidentifier PesterTimer } 
+            { Get-Event -ErrorAction SilentlyContinue | Should Not Contain PesterTimer }
+  	}
+
+        It "Should remove an event given an event identifier" {
+            { $events = Get-Event -sourceidentifier PesterTimer }
+	    { $events = $events.EventIdentifier }
+	    { Remove-Event -EventIdentifier $events }
+            { $events = Get-Event -ErrorAction SilentlyContinue}
+	    { $events.SourceIdentifier | Should Not Contain "PesterTimer" }
+	}
+
+	It "Should be able to remove an event given a pipe from Get-Event" {
+	    { Get-Event -sourceidentifier PesterTimer | Remove-Event }
+	    { Get-Event -ErrorAction SilentlyContinue | Should Not Contain "PesterTimer" } 
+
+	}
+
+	It "Should NOT remove an event given the whatif flag" {
+            { Remove-Event -sourceidentifier PesterTimer -whatif }
+            { $events = Get-Event }
+            { $events.SourceIdentifier  | Should Contain "PesterTimer" }
+	}
+    }
+}
diff --git a/src/pester-tests/Start-Sleep.Tests.ps1 b/src/pester-tests/Start-Sleep.Tests.ps1
new file mode 100644
index 0000000000..43fede7698
--- /dev/null
+++ b/src/pester-tests/Start-Sleep.Tests.ps1
@@ -0,0 +1,14 @@
+Describe "Start-Sleep" {
+
+    Context "Validate Start-Sleep works properly" {
+        It "Should only sleep for at least 3 seconds"{
+           $result = Measure-Command { Start-Sleep -s 3 }
+	     $result.Seconds | Should BeGreaterThan 2
+	 }
+
+        It "Should sleep for at least 3 seconds using the alias" {
+	    $result = Measure-Command { sleep -s 3 }
+	    $result.Seconds | Should BeGreaterThan 2
+	}
+    }
+}
diff --git a/src/pester-tests/Tee-Object.Tests.ps1 b/src/pester-tests/Tee-Object.Tests.ps1
new file mode 100644
index 0000000000..1fd926b4ac
--- /dev/null
+++ b/src/pester-tests/Tee-Object.Tests.ps1
@@ -0,0 +1,35 @@
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+
+Describe "Tee-Object" {
+
+    Context "Validate Tee-Object is correctly forking output" {
+
+        It "Should return the output to the screen and to the variable" {
+            $teefile = "$here/assets/testfile.txt"
+	    echo teeobjecttest1    |    Tee-Object -variable teeresults
+	    $teeresults                 |     Should Be "teeobjecttest1"
+	    Remove-Item $teefile -ErrorAction SilentlyContinue
+	}
+
+        It "Should return the output to the screen and to the variable from the alias" {
+	     $teefile = "$here/assets/testfile.txt"
+            echo teeobjecttest2    |    tee -variable teeresults
+            $teeresults                 |    Should Be "teeobjecttest2"
+	     Remove-Item $teefile -ErrorAction SilentlyContinue
+	 }
+
+         It "Should tee the output to a file" {
+	     $teefile = "$here/assets/testfile.txt"
+	     echo teeobjecttest3  | Tee-Object $teefile
+	     Get-Content $teefile | Should Be "teeobjecttest3"
+	     Remove-Item $teefile -ErrorAction SilentlyContinue
+	 }
+
+         It "Should tee the output to a file using the alias" {
+	     $teefile = "$here/assets/testfile.txt"
+	     echo teeobjecttest4  | tee $teefile
+	     Get-Content $teefile | Should Be "teeobjecttest4"
+	     Remove-item $teefile -ErrorAction SilentlyContinue
+	 }      
+    }
+}
diff --git a/src/pester-tests/Update-FormatData.Tests.ps1 b/src/pester-tests/Update-FormatData.Tests.ps1
new file mode 100644
index 0000000000..f8c522050c
--- /dev/null
+++ b/src/pester-tests/Update-FormatData.Tests.ps1
@@ -0,0 +1,15 @@
+Describe "Update-FormatData" {
+
+    Context "Validate Update-FormatData update correctly" {
+
+        It "Should not throw upon reloading previous formatting file" {
+	    { Update-FormatData } | Should Not throw
+	}
+
+	It "Should validly load formatting data" {
+            { Get-FormatData -typename System.Diagnostics.Process | Export-FormatData -Path "outputfile.ps1xml" }
+	    { Update-FormatData -prependPath "outputfile.ps1xml" | Should Not throw }
+	    { Remove-Item "outputfile.ps1xml" -ErrorAction SilentlyContinue }
+	}
+    }
+}
diff --git a/src/pester-tests/Update-TypeData.Tests.ps1 b/src/pester-tests/Update-TypeData.Tests.ps1
new file mode 100644
index 0000000000..611e88d151
--- /dev/null
+++ b/src/pester-tests/Update-TypeData.Tests.ps1
@@ -0,0 +1,15 @@
+Describe "Update-TypeData" {
+
+    Context "Validate Update-Type updates correctly" {
+
+        It "Should not throw upon reloading previous formatting file" {
+            { Update-TypeData } | Should Not throw
+        }
+
+        It "Should validly load formatting data" {
+           { Get-TypeData -typename System.Diagnostics.Process | Export-TypeData -Path "outputfile.ps1xml" }
+           { Update-TypeData -prependPath "outputfile.ps1xml" | Should Not throw }
+           { Remove-Item "outputfile.ps1xml" -ErrorAction SilentlyContinue }
+        }
+    }
+}
diff --git a/src/pester-tests/Wait-Event.Tests.ps1 b/src/pester-tests/Wait-Event.Tests.ps1
new file mode 100644
index 0000000000..99cbefee15
--- /dev/null
+++ b/src/pester-tests/Wait-Event.Tests.ps1
@@ -0,0 +1,9 @@
+Describe "Wait-Event" {
+
+    Context "Validate Wait-Event is waiting for events" {
+	It "Should verify Wait-Event is waiting for at least a second" {
+	    $waiteventtime = Measure-Command { Wait-Event -timeout 1 }
+            $waiteventtime.Seconds | Should BeGreaterThan 0
+	}
+    }
+}
diff --git a/src/pester-tests/assets/pesteralias.txt b/src/pester-tests/assets/pesteralias.txt
new file mode 100755
index 0000000000..e375d15fec
Binary files /dev/null and b/src/pester-tests/assets/pesteralias.txt differ