Fix for delete post-config-load. (#68)

Author: philliphoff

Diff for: src/KubernetesClientConfiguration.ConfigFile.cs

@@ -223,7 +223,10 @@ private static K8SConfiguration LoadKubeConfig(FileInfo kubeconfig)
 
             var deserializeBuilder = new DeserializerBuilder();
             var deserializer = deserializeBuilder.Build();
-            return deserializer.Deserialize<K8SConfiguration>(kubeconfig.OpenText());
+            using (var kubeConfigTextStream = kubeconfig.OpenText())
+            {
+                return deserializer.Deserialize<K8SConfiguration>(kubeConfigTextStream);
+            }
         }
     }
 }

Diff for: tests/KubernetesClientConfigurationTests.cs

@@ -250,14 +250,40 @@ public void SmartSkipTlsVerify()
         [Fact]
         public void NoCurrentContext()
         {
-            var fi = new FileInfo("assets/kubeconfig.no-current-context.yml");
-
-            // failed if cannot infer any server host
-            Assert.Throws<KubeConfigException>(() => KubernetesClientConfiguration.BuildConfigFromConfigFile(fi));
-
-            // survive when masterUrl is set
-            var cfg = KubernetesClientConfiguration.BuildConfigFromConfigFile(fi, masterUrl: "http://test.server");
+            var fi = new FileInfo("assets/kubeconfig.no-current-context.yml");
+
+            // failed if cannot infer any server host
+            Assert.Throws<KubeConfigException>(() => KubernetesClientConfiguration.BuildConfigFromConfigFile(fi));
+
+            // survive when masterUrl is set
+            var cfg = KubernetesClientConfiguration.BuildConfigFromConfigFile(fi, masterUrl: "http://test.server");
             Assert.Equal("http://test.server", cfg.Host);
-        }
+        }
+
+        /// <summary>
+        ///     Checks that loading a configuration from a file leaves no outstanding handles to the file.
+        /// </summary>
+        /// <remarks>
+        ///     This test fails only on Windows.
+        /// </remarks>
+        [Fact]
+        public void DeletedConfigurationFile()
+        {
+            var assetFileInfo = new FileInfo("assets/kubeconfig.yml");
+            var tempFileInfo = new FileInfo(Path.GetTempFileName());
+            
+            File.Copy(assetFileInfo.FullName, tempFileInfo.FullName, /* overwrite: */ true);
+
+            KubernetesClientConfiguration config;
+
+            try
+            {
+                config = KubernetesClientConfiguration.BuildConfigFromConfigFile(tempFileInfo);
+            }
+            finally
+            {
+                File.Delete(tempFileInfo.FullName);
+            }
+        }
     }
 }