Fix issue with Clear-AzureRmContext where old default context name was being used for empty context

Author: cormacpayne

src/ResourceManager/Common/Commands.Common.Authentication.ResourceManager/AzureRmProfile.cs

@@ -317,6 +317,7 @@ public string ToString(bool serializeCache)
         public void Clear()
         {
             Contexts.Clear();
+            DefaultContextKey = "Default";
             DefaultContext = new AzureContext();
             EnvironmentTable.Clear();
             foreach (var environment in AzureEnvironment.PublicEnvironments)

src/ResourceManager/Profile/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Current Release
+* Fix issue where running `Clear-AzureRmContext` would keep an empty context with the name of the previous default context, which prevented the user from creating a new context with the old name
 
 ## Version 5.0.1
 * Fix issue where default environments weren''t being retrieved without a default context set

src/ResourceManager/Profile/Commands.Profile.Test/ContextCmdletTests.cs

@@ -210,6 +210,43 @@ public void ListMultipleContexts()
             }
         }
 
+        [Fact]
+        [Trait(Category.AcceptanceType, Category.CheckIn)]
+        public void ClearContextSetsDefaultContextName()
+        {
+            var getCmdlet = new GetAzureRMContextCommand();
+            var profile = CreateMultipleContextProfile();
+            var defaultContextName = profile.DefaultContextKey;
+            getCmdlet.CommandRuntime = commandRuntimeMock;
+            getCmdlet.DefaultProfile = profile;
+            getCmdlet.InvokeBeginProcessing();
+            getCmdlet.ExecuteCmdlet();
+            getCmdlet.InvokeEndProcessing();
+            Assert.True(commandRuntimeMock.OutputPipeline != null);
+            Assert.Equal(1, commandRuntimeMock.OutputPipeline.Count);
+            Assert.Equal(defaultContextName, ((PSAzureContext)commandRuntimeMock.OutputPipeline[0]).Name);
+
+            var clearCmdlet = new ClearAzureRmContext();
+            commandRuntimeMock = new MockCommandRuntime();
+            clearCmdlet.CommandRuntime = commandRuntimeMock;
+            clearCmdlet.DefaultProfile = profile;
+            clearCmdlet.Scope = ContextModificationScope.Process;
+            clearCmdlet.PassThru = true;
+            clearCmdlet.InvokeBeginProcessing();
+            clearCmdlet.ExecuteCmdlet();
+            clearCmdlet.InvokeEndProcessing();
+            Assert.NotNull(commandRuntimeMock.OutputPipeline);
+            Assert.Equal(1, commandRuntimeMock.OutputPipeline.Count);
+            var result = (bool)(commandRuntimeMock.OutputPipeline[0]);
+            Assert.True(result);
+            Assert.True(profile.Contexts != null);
+            Assert.Equal(1, profile.Contexts.Count);
+            Assert.True(profile.Contexts.ContainsKey("Default"));
+            Assert.NotNull(profile.DefaultContext);
+            Assert.Null(profile.DefaultContext.Account);
+            Assert.Null(profile.DefaultContext.Subscription);
+        }
+
         [Fact]
         [Trait(Category.AcceptanceType, Category.CheckIn)]
         public void RemoveDefaultContext()