add test for Get-CredentialStore

tests/Store/01_Get-CredentialStore.Tests.ps1

@@ -33,5 +33,8 @@ Describe "Get-CredentialStore" {
 
             {Get-CredentialStore -Path $TestCredentialStore} | Should Not Throw
         }
+        It "Test3: Not existing path should return false" {
+            Get-CredentialStore -Path 'C:\foobar\CredentialStore.json' -Shared | Should -Be $false
+        }
     }
 }