Improve behaviour of casting and comparing [Blank] (vexx32#157)

Improve behaviour of [Blank] & Small Refactoring

PSKoans/Classes/Blank.ps1

@@ -2,8 +2,24 @@ class Blank {
     [string] ToString() {
         return $null
     }
-
-    [bool] op_Equals([object] $other) {
+
+    [bool] Equals([object] $other) {
+        return $false
+    }
+
+    static [bool] op_Equality([Blank] $self, [object] $other) {
+        return $false
+    }
+
+    static [bool] op_Inequality([Blank] $self, [object] $other) {
+        return $true
+    }
+
+    static [bool] op_Explicit([Blank] $Instance) {
+        return $false
+    }
+
+    static [bool] op_Implicit([Blank] $Instance) {
         return $false
     }
 }

PSKoans/Koans/Foundations/AboutAssertions.Koans.ps1

@@ -24,7 +24,7 @@ Describe 'Equality' {
 
     It 'is a simple comparison' {
         # Some truths are absolute.
-        __ | Should -Be $true
+        '__' | Should -Be 'True!'
     }
 
     It 'expects you to fill in values' {

Tests/KoanValidation.Tests.ps1

@@ -6,15 +6,14 @@ Describe "Koan Assessment" {
     $Scripts = Get-ChildItem -Path $KoanFolder -Recurse -Filter '*.Koans.ps1'
 
     # TestCases are splatted to the script so we need hashtables
-    $TestCases = $Scripts | ForEach-Object { @{File = $_} }
+    $TestCases = $Scripts | ForEach-Object { @{File = $_ } }
     It "<File> koans should be valid powershell" -TestCases $TestCases {
         param($File)
 
         $File.FullName | Should -Exist
 
-        $FileContents = Get-Content -Path $File.FullName -ErrorAction Stop
-        $Errors = $null
-        [System.Management.Automation.PSParser]::Tokenize($FileContents, [ref]$Errors) > $null
+        $Errors = $Tokens = $null
+        [System.Management.Automation.Language.Parser]::ParseFile($file.FullName, [ref]$Tokens, [ref]$Errors) > $null
         $Errors.Count | Should -Be 0
     }
 }