Added tow new tests, checking for no credentials and no server

tests/KubernetesClientConfigurationTests.cs

@@ -23,6 +23,16 @@ namespace k8s.Tests
         /// </summary>
         private static readonly string kubeConfigUserPassword = "assets/kubeconfig.user-pass.yml";
 
+        /// <summary>
+        /// Sample configuration file with incorrect user credentials structures on purpose
+        /// </summary>
+        private static readonly string kubeConfigNoCredentials = "assets/kubeconfig.no-credentials.yml";
+
+        /// <summary>
+        /// Sample configuration file with incorrect cluster/server structure on purpose
+        /// </summary>
+        private static readonly string kubeConfigNoServer = "assets/kubeconfig.no-server.yml";
+
         /// <summary>
         /// The configuration file is not present. An KubeConfigException should be thrown
         /// </summary>
@@ -132,6 +142,26 @@ namespace k8s.Tests
             Assert.Equal("secret", cfg.Password);
         }
 
+        /// <summary>
+        /// Checks that a KubeConfigException is thrown when incomplete user credentials
+        /// </summary>
+        [Fact]
+        public void IncompleteUserCredentials()
+        {
+            var fi = new FileInfo(kubeConfigNoCredentials);
+            Assert.Throws<k8s.Exceptions.KubeConfigException>(() => new KubernetesClientConfiguration(fi)); 
+        }
+
+        /// <summary>
+        /// Checks that a KubeConfigException is thrown when the server property is not set in cluster
+        /// </summary>
+        [Fact]
+        public void ServerNotFound()
+        {
+            var fi = new FileInfo(kubeConfigNoServer);
+            Assert.Throws<k8s.Exceptions.KubeConfigException>(() => new KubernetesClientConfiguration(fi)); 
+        }
+
         // /// <summary>
         // /// Checks if the are pods
         // /// </summary>

tests/assets/kubeconfig.no-credentials.yml

@@ -0,0 +1,20 @@
+# Sample file based on https://kubernetes.io/docs/tasks/access-application-cluster/authenticate-across-clusters-kubeconfig/
+# WARNING: File includes minor fixes
+---
+current-context: federal-context
+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: path/to/my/cafile
+    server: https://horse.org:4443
+  name: horse-cluster
+contexts:
+- context:
+    cluster: horse-cluster
+    namespace: chisel-ns
+    user: green-user
+  name: federal-context
+kind: Config
+users:
+- name: green-user
+  user:

tests/assets/kubeconfig.no-server.yml

@@ -0,0 +1,21 @@
+# Sample file based on https://kubernetes.io/docs/tasks/access-application-cluster/authenticate-across-clusters-kubeconfig/
+# WARNING: File includes minor fixes
+---
+current-context: federal-context
+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: path/to/my/cafile
+  name: horse-cluster
+contexts:
+- context:
+    cluster: horse-cluster
+    namespace: chisel-ns
+    user: green-user
+  name: federal-context
+kind: Config
+users:
+- name: green-user
+  user:
+    password: secret
+    username: admin