Fix exception propagating outside of describe when AfterAll throws

Functions/Describe.ps1

@@ -140,26 +140,44 @@ function DescribeImpl {
     $testDriveAdded = $false
     try
     {
-        if (-not $NoTestDrive)
+        try
         {
-            if (-not (Test-Path TestDrive:\))
+            if (-not $NoTestDrive)
             {
-                New-TestDrive
-                $testDriveAdded = $true
+                if (-not (Test-Path TestDrive:\))
+                {
+                    New-TestDrive
+                    $testDriveAdded = $true
+                }
+                else
+                {
+                    $TestDriveContent = Get-TestDriveChildItem
+                }
             }
-            else
-            {
-                $TestDriveContent = Get-TestDriveChildItem
-            }
-        }
 
-        Add-SetupAndTeardown -ScriptBlock $Fixture
-        Invoke-TestGroupSetupBlocks
+            Add-SetupAndTeardown -ScriptBlock $Fixture
+            Invoke-TestGroupSetupBlocks
 
-        do
+            do
+            {
+                $null = & $Fixture
+            } until ($true)
+        }
+        finally
         {
-            $null = & $Fixture
-        } until ($true)
+            Invoke-TestGroupTeardownBlocks
+            if (-not $NoTestDrive)
+            {
+                if ($testDriveAdded)
+                {
+                    Remove-TestDrive
+                }
+                else
+                {
+                    Clear-TestDrive -Exclude ($TestDriveContent | & $SafeCommands['Select-Object'] -ExpandProperty FullName)
+                }
+            }
+        }
     }
     catch
     {
@@ -170,21 +188,6 @@ function DescribeImpl {
             & $TestOutputBlock $Pester.TestResult[-1]
         }
     }
-    finally
-    {
-        Invoke-TestGroupTeardownBlocks
-        if (-not $NoTestDrive)
-        {
-            if ($testDriveAdded)
-            {
-                Remove-TestDrive
-            }
-            else
-            {
-                Clear-TestDrive -Exclude ($TestDriveContent | & $SafeCommands['Select-Object'] -ExpandProperty FullName)
-            }
-        }
-    }
 
     Exit-MockScope
 

Functions/TestsRunningInCleanRunspace.Tests.ps1

@@ -174,4 +174,34 @@ Describe 'Guarantee It fail on setup or teardown fail (running in clean runspace
         $result.FailedCount | Should Be 1
         $result.TestResult[0].FailureMessage | Should Be "test exception"
     }
+
+    Context 'Teardown fails' {
+        It "Failed teardown does not let exception propagate outside of the scope of Describe/Context in which it failed" {
+            $testSuite = {
+                $teardownFailure = $null
+
+                try {
+                    Context 'This is a test context' {
+                        AfterAll {
+                            throw 'I throw in Afterall'
+                        }
+                    }
+                }
+                catch {
+                    $teardownFailure = $_
+                }
+                It "Failed teardown does not let exception propagate outside of the scope of Describe/Context in which it failed" {
+                    # issue #584, #662
+                    $teardownFailure | Should -BeNullOrEmpty
+                }
+            }
+            $result = Invoke-PesterInJob -ScriptBlock $testSuite
+
+            # the second test should pass because correctly the exception does not propagate
+            $result.PassedCount | Should -Be 1
+
+            # the first test should fail because after all throws
+            $result.FailedCount | Should -Be 1
+        }
+    }
 }