Added New-Timespan tests

- fixed whitespace and minor typos
- added tests to increase test coverage of function and test the output
- increased failure threshold to one hundredth of a second

src/pester-tests/New-TimeSpan.Tests.ps1

@@ -0,0 +1,46 @@
+Describe "New-TimeSpan" {
+    It "Should be able to create a new timespan object" {
+        New-Variable -Name testObject -Value $(New-TimeSpan)
+
+        $testObject.GetType() | Should Be timespan
+    }
+
+    Context "Core Functionality Tests" {
+        New-Variable -Name testObject -Value $(New-TimeSpan -Days 2 -Hours 23 -Minutes 4 -Seconds 3) -Force
+
+            $expectedOutput = @{ "Days"              = "2";
+                                 "Hours"             = "23";
+                                 "Minutes"           = "4";
+                                 "Seconds"           = "3";
+                                 "Milliseconds"      = "0";
+                                 "Ticks"             = "2558430000000";
+                                 "TotalDays"         = "2.96114583333333";
+                                 "TotalHours"        = "71.0675";
+                                 "TotalMinutes"      = "4264.05";
+                                 "TotalSeconds"      = "255843";
+                                 "TotalMilliseconds" = "255843000"
+            }
+
+            $TEN_MILLION = 10000000
+
+        It "Should have expected values for time properties set during creation" {
+            $testObject.Days    | Should Be $expectedOutput["Days"]
+            $testObject.Hours   | Should Be $expectedOutput["Hours"]
+            $testObject.Minutes | Should Be $expectedOutput["Minutes"]
+            $testObject.Seconds | Should Be $expectedOutput["Seconds"]
+            $testObject.Ticks   | Should Be $expectedOutput["Ticks"]
+        }
+
+    }
+
+    It "Should have matching output when using the Start switch vs piping from another cmdlet" {
+        # this file is guarenteed to exist
+        $inputObject    = (Get-ChildItem $PSScriptRoot/New-TimeSpan.Tests.ps1)
+        $inputParameter = New-TimeSpan -Start $inputObject.lastwritetime
+        $pipedInput     = $inputObject | New-TimeSpan
+
+        $difference = [math]::Abs($inputParameter.Milliseconds - $pipedInput.Milliseconds)
+        # The difference between commands should be minimal
+        $difference | Should BeLessThan 10
+    }
+}