Add tests for FQDN and SymLink

src/ps_test/test_CorePsPlatform.cs

@@ -90,6 +90,31 @@ namespace PSTests
             }
 
 
+        }
+
+        [Fact]
+        public static void TestGetFQDN()
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = @"/usr/bin/env",
+                Arguments = "hostname --fqdn",
+                RedirectStandardOutput = true,
+                UseShellExecute = false
+            };
+            using (Process process = Process.Start(startInfo))
+            {
+                 // Get output of call to hostname without trailing newline
+                string hostname = process.StandardOutput.ReadToEnd().Trim();
+                process.WaitForExit();
+
+                // The process should return an exit code of 0 on success
+                Assert.Equal(0, process.ExitCode);
+                // It should be the same as what our platform code returns
+                Assert.Equal(hostname, Platform.NonWindowsGetHostName());
+            }
+
+
         }
 
         [Fact]
@@ -181,6 +206,47 @@ namespace PSTests
             Assert.False(Platform.NonWindowsIsHardLink(fd));
         }
 
+        [Fact]
+        public static void TestFileIsSymLink()
+        {
+            string path = @"/tmp/originallink";
+            if (File.Exists(path))
+            {
+                File.Delete(path);
+            }
+
+            File.Create(path);
+
+            string link = "/tmp/newlink";
+
+            if (File.Exists(link))
+            {
+                File.Delete(link);
+            }
+
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = @"/usr/bin/env",
+                Arguments = "ln -s " + path + " " + link,
+                RedirectStandardOutput = true,
+                UseShellExecute = false
+            };
+
+            using (Process process = Process.Start(startInfo))
+            {
+                process.WaitForExit();
+                Assert.Equal(0, process.ExitCode);
+            }
+
+            FileSystemInfo fd = new FileInfo(path);
+            Assert.False(Platform.NonWindowsIsSymLink(fd));
+
+            fd = new FileInfo(link);
+            Assert.True(Platform.NonWindowsIsSymLink(fd));
+
+            File.Delete(path);
+            File.Delete(link);
+        }
 
         [Fact]
         public static void TestCommandLineArgvReturnsAnElement()