PowerShell · kalgiz · May 16, 2018 · May 16, 2018 · May 17, 2018 · May 18, 2018
diff --git a/src/System.Management.Automation/FormatAndOutput/common/BaseOutputtingCommand.cs b/src/System.Management.Automation/FormatAndOutput/common/BaseOutputtingCommand.cs
@@ -761,14 +761,25 @@ private void ProcessCachedGroupOnWide(WideViewHeaderInfo wvhi, List<PacketInfoDa
         /// </summary>
         static private int GetConsoleWindowWidth(int columnNumber)
         {
+            if (InternalTestHooks.SetConsoleWidthToZero)
+            {
+                return DefaultConsoleWidth;
+            }
             if (columnNumber == int.MaxValue)
             {
                 if (_noConsole)
                 {
                     return DefaultConsoleWidth;
                 }
+
                 try
                 {
+                    // if Console width is set to 0, the default width is returned so that the output string is not null.
+                    // Fix added because console width on VSTS is equal to 0.
+                    if (Console.WindowWidth == 0)
+                    {
+                        return DefaultConsoleWidth;
+                    }
                     return Console.WindowWidth;
                 }
                 catch

diff --git a/src/System.Management.Automation/engine/Utils.cs b/src/System.Management.Automation/engine/Utils.cs
@@ -1509,6 +1509,7 @@ public static class InternalTestHooks
         // Simulate 'System.Diagnostics.Stopwatch.IsHighResolution is false' to test Get-Uptime throw
         internal static bool StopwatchIsNotHighResolution;
         internal static bool DisableGACLoading;
+        internal static bool SetConsoleWidthToZero;
 
         /// <summary>This member is used for internal test purposes.</summary>
         public static void SetTestHook(string property, object value)

diff --git a/test/powershell/Modules/Microsoft.PowerShell.Utility/Format-Table.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Utility/Format-Table.Tests.ps1
@@ -717,4 +717,19 @@ abc bcd
             $output = $obj | Format-Table | Out-String
             $output.Replace("`r","").Replace(" ",".").Replace("`n","^") | Should -BeExactly $expectedTable.Replace("`r","").Replace(" ",".").Replace("`n","^")
         }
+
+        It "Should not return null when the Console width is equal to 0" {
+            [system.management.automation.internal.internaltesthooks]::SetTestHook('SetConsoleWidthToZero', $true)
+            try
+            {
+                # Fill the console window with the string, so that it reaches its max width.
+                # Check if the max width is equal to default value (120), to test test hook set.
+                $testObject = @{ test = '1' * 200}
+                Format-Table -inputobject $testObject | Out-String -str | ForEach-Object {$_.length} | Sort-Object | Select-Object -Last 1 | Should -Be 120
+                Format-Table -inputobject $testObject | Should -Not -BeNullOrEmpty
+            }
+            finally {
+                [system.management.automation.internal.internaltesthooks]::SetTestHook('SetConsoleWidthToZero', $false)
+            }
+        }
     }