Add tests for hierarchical paths

test/powershell/Hierarchical-Path.Tests.ps1

@@ -0,0 +1,46 @@
+Describe "Hierarchical paths" {
+    BeforeAll {
+        $data = "Hello World"
+        Setup -File testFile.txt -Content $data
+    }
+
+    It "should work with Join-Path " {
+        $testPath = Join-Path $TestDrive testFile.txt
+        Get-Content $testPath | Should Be $data
+    }
+
+    It "should work with platform's slashes" {
+        $testPath = "$TestDrive$([IO.Path]::DirectorySeparatorChar)testFile.txt"
+        Get-Content $testPath | Should Be $data
+    }
+
+    It "should work with forward slashes" {
+        $testPath = "$TestDrive/testFile.txt"
+        Get-Content $testPath | Should Be $data
+    }
+
+    It "should work with backward slashes" {
+        $testPath = "$TestDrive\testFile.txt"
+        Get-Content $testPath | Should Be $data
+    }
+
+    It "should work with backward slashes for each separator" {
+        $testPath = "$TestDrive\testFile.txt".Replace("/","\")
+        Get-Content $testPath | should be $data
+    }
+
+    It "should work with forward slashes for each separator" {
+        $testPath = "$TestDrive/testFile.txt".Replace("\","/")
+        Get-Content $testPath | should be $data
+    }
+
+    It "should work even if there are too many forward slashes" {
+        $testPath = "$TestDrive//////testFile.txt"
+        Get-Content $testPath | should be $data
+    }
+
+    It "should work even if there are too many backward slashes" {
+        $testPath = "$TestDrive\\\\\\\testFile.txt"
+        Get-Content $testPath | should be $data
+    }
+}