authority is not case sensitive.

extensions/notebook-test/package.json

@@ -40,7 +40,7 @@
         ]
       },
       {
-        "viewType": "jupyterTest",
+        "viewType": "jupytertest",
         "displayName": "Jupyter Test",
         "selector": [
           {

extensions/notebook-test/src/extension.ts

@@ -13,7 +13,7 @@ export function activate(context: vscode.ExtensionContext) {
 	console.log(context.extensionPath);
 
 	context.subscriptions.push(vscode.window.registerNotebookProvider('jupyter', new NotebookProvider(context.extensionPath, true)));
-	context.subscriptions.push(vscode.window.registerNotebookProvider('jupyterTest', new NotebookProvider(context.extensionPath, false)));
+	context.subscriptions.push(vscode.window.registerNotebookProvider('jupytertest', new NotebookProvider(context.extensionPath, false)));
 	vscode.commands.registerCommand('notebook.saveToMarkdown', () => {
 		if (vscode.window.activeNotebookDocument) {
 			let document = vscode.window.activeNotebookDocument;

src/vs/workbench/contrib/notebook/browser/notebookService.ts

@@ -16,6 +16,7 @@ import { basename, extname } from 'vs/base/common/path';
 
 export function createCellUri(viewType: string, notebook: INotebook, cell: ICell): URI {
 	//vscode-notebook://<viewType>/cell_<cellHandle>.ext
+	// @todo Jo,Peng: `authority` will be transformed to lower case in `URI.toString()`, so we won't retrive the same viewType later on.
 	return URI.from({
 		scheme: 'vscode-notebook',
 		authority: viewType,