spec/support/hyperv.Tests.ps1 in kitchen-hyperv-0.1.20 vs spec/support/hyperv.Tests.ps1 in kitchen-hyperv-0.2.0

@@ -1,2 +1,43 @@
-. $PSScriptRoot\..\..\support\hyperv.ps1
-
+. $PSScriptRoot\..\..\support\hyperv.ps1
+
+describe 'New-DifferencingDisk' {
+  mock new-vhd -Verifiable -MockWith {}
+
+  context 'mandatory parameters' {
+    mock Test-Path -MockWith {}
+
+    $command = get-command new-differencingDisk
+
+    it 'Path is mandatory' {
+      $Command.Parameters['Path'].Attributes.Mandatory | should be $true
+    }
+    it 'ParentPath is mandatory' {
+      $Command.Parameters['ParentPath'].Attributes.Mandatory | should be $true
+    }
+  }
+
+  context 'when differencing disk exists' {
+    mock Test-Path -ParameterFilter {$Path -eq 'c:\.kitchen\diff.vhd'} -MockWith {$true}
+
+    new-differencingDisk -Path 'c:\.kitchen\diff.vhd' -parentpath 'c:\source.vhd'
+
+    it 'does not create a new vhd' {
+      Assert-MockCalled new-vhd -Times 0
+    }
+  }
+
+  context 'when a differencing disk does not exist' {
+    mock Test-Path -ParameterFilter {$Path -eq 'c:\.kitchen\diff.vhd'} -MockWith {$false}
+
+    new-differencingDisk -Path 'c:\.kitchen\diff.vhd' -parentpath 'c:\source.vhd'
+
+    it 'creates a new differencing disk' {
+      Assert-MockCalled new-vhd -Times 1 -ParameterFilter {
+        $Path -eq 'c:\.kitchen\diff.vhd' -and 
+        $ParentPath -eq 'c:\source.vhd' -and 
+        $Differencing -eq $true
+      }
+    }
+  }
+}
+