adds tests for Test-ChallengeFile

tests/ChallengeFile/01_Test-ChallengeFile.Tests.ps1

@@ -0,0 +1,39 @@
+#region HEADER
+$RepoRoot = (Get-GitDirectory).replace('\.git', '')
+$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.Tests\.', '.'
+$sut = $sut -replace "\d{2}`_", ''
+$suthome = (Get-ChildItem -Path $RepoRoot -Exclude ".\tests\" -Filter $sut -Recurse).FullName
+# Skip try loading the source file if it doesn't exists.
+If ($suthome.Length -gt 0) {
+    . $suthome
+}
+Else {
+    Write-Warning ("Could not find source file {0}" -f $sut)
+}
+
+# load additional functions defined in the repository. Replace the expression <FunctionName>.
+. (Get-ChildItem -Path $RepoRoot -Filter "Test-ChallengeFile.ps1" -Recurse).FullName
+
+#endregion HEADER
+
+Describe "Test-ChallengeFile" {
+    Context "Basic input tests" {
+        Mock Test-Path {return $true}
+        It "No parameter with existing challenge file" {
+            {Test-ChallengeFile} | Should -Not -Throw
+        }
+        It "No parameter and existing file should return true" {
+            Test-ChallengeFile | Should -Be $true
+        }
+        Context "Execute with parameter" {
+            $TestChFile = "{0}\resources\Challenge.bin" -f $RepoRoot
+            It "Provide valid path" {
+                Test-ChallengeFile -Path $TestChFile | Should -Be $true
+            }
+            It "Provide fake path" {
+                Test-ChallengeFile -Path "C:\notexisting.bin" | Should -Be $false
+            }
+        }
+
+    }
+}