Added Get-PSProvider unit tests

src/pester-tests/Test-Get-PSProvider.Tests.ps1

@@ -0,0 +1,25 @@
+Describe "Test-Get-PSProvider" {
+    It "Should be able to call with no parameters without error" {
+        { Get-PSProvider } | Should Not Throw
+    }
+
+    It "Should be able to call the filesystem provider" {
+        { Get-PSProvider FileSystem } | Should Not Throw
+
+        $actual = Get-PSProvider FileSystem
+
+        $actual.Name | Should Be "FileSystem"
+
+        $actual.Capabilities | Should Be "Filter, ShouldProcess, Credentials"
+    }
+
+    It "Should be able to call a provider with a wildcard expression" {
+        { Get-PSProvider File*m } | Should Not Throw
+    }
+
+    It "Should be able to pipe the output" {
+        $actual = Get-PSProvider
+
+        { $actual | Format-List } | Should Not Throw
+    }
+}