Merge pull request 137 from dev/158-ishardlink-xunit into develop

src/ps_test/test_CorePsPlatform.cs

@@ -1,5 +1,6 @@
 using Xunit;
 using System;
+using System.IO;
 using System.Diagnostics;
 using System.Management.Automation;
 
@@ -90,5 +91,48 @@ namespace PSTests
 
 
         }
+
+        [Fact]
+        public static void TestExistantFileIsHardLink()
+        {
+            string path = @"/tmp/MyTest";
+            if (!File.Exists(path))
+            {
+                File.Create(path);
+            }
+            // Create a file to write to using StreamWriter. 
+            // convert string to stream.  On Windows, this appears to be handled, but on *nix, 
+            // we apparently need to convert to UTF8.
+            byte[] byteArray    = System.Text.Encoding.UTF8.GetBytes(path);
+            MemoryStream stream = new MemoryStream(byteArray);
+
+            // Convert `path` string to FileSystemInfo data type. And now, it should return true
+            FileSystemInfo fd = new FileInfo(path);
+            Assert.True(Platform.NonWindowsIsHardLink(fd));
+        }
+
+        [Fact]
+        public static void TestDirectoryIsHardLink()
+        {
+            string path = @"/tmp";
+
+            // Convert `path` string to FileSystemInfo data type. And now, it should return true
+            FileSystemInfo fd = new FileInfo(path);
+            Assert.False(Platform.NonWindowsIsHardLink(fd));
+        }
+
+        [Fact]
+        public static void TestNonExistantIsHardLink()
+        {
+            // A file that should *never* exist on a test machine:
+            string path = @"/tmp/ThisFileShouldNotExistOnTestMachines";
+
+            // If the file exists, then there's a larger issue that needs to be looked at
+            Assert.False(File.Exists(path));
+
+            // Convert `path` string to FileSystemInfo data type. And now, it should return true
+            FileSystemInfo fd = new FileInfo(path);
+            Assert.False(Platform.NonWindowsIsHardLink(fd));
+        }
     }
 }