Add more tests to local content manager (#10350)

* Add more tests

* Add descriptive messages to asserts and remove formats check

* Address comments

src/sql/workbench/contrib/notebook/test/electron-browser/contentManagers.test.ts

@@ -33,6 +33,7 @@ let expectedNotebookContent: nb.INotebookContents = {
 	nbformat: 4,
 	nbformat_minor: 2
 };
+
 let notebookContentString = JSON.stringify(expectedNotebookContent);
 
 function verifyMatchesExpectedNotebook(notebook: nb.INotebookContents): void {
@@ -131,12 +132,75 @@ suite('Local Content Manager', function (): void {
 		let displayOutput = <nb.IDisplayData>notebook.cells[0].outputs[0];
 		assert.equal(displayOutput.data['text/html'], '<div></div>');
 	});
-	test('Should create a new empty notebook if content is undefined', async function (): Promise<void> {
-		// verify that when loading content from an empty string or undefined, a new notebook is created.
-		let content = await contentManager.loadFromContentString('');
-		assert.equal(content.cells.length, 0);
 
-		content = await contentManager.loadFromContentString(undefined);
-		assert.equal(content.cells.length, 0);
+	test('Should create a new empty notebook if content is undefined', async function (): Promise<void> {
+		// verify that when loading content from an empty string, a new notebook is created.
+		let content = await contentManager.loadFromContentString(undefined);
+		assert.equal(content.metadata, undefined, 'Verify that metadata is undefined');
+		// verify that the notebook is empty
+		assert.equal(content.cells.length, 0, 'Notebook should be empty, so the number of cells should be 0');
+	});
+
+	test('Should create a new empty notebook if content is an empty string', async function (): Promise<void> {
+		// verify that when loading content from an empty string, a new notebook is created.
+		let content = await contentManager.loadFromContentString('');
+		assert.equal(content.metadata, undefined, 'Verify that metadata is undefined');
+		// verify that the notebook is empty
+		assert.equal(content.cells.length, 0, 'Notebook should be empty, so the number of cells should be 0');
+	});
+
+	test('Should create a markdown cell', async function (): Promise<void> {
+		let expectedNotebookMarkdownContent: nb.INotebookContents = {
+			cells: [{
+				cell_type: CellTypes.Markdown,
+				source: '# Header 1'
+			}],
+			metadata: {
+				kernelspec: {
+					name: 'mssql',
+					language: 'sql'
+				}
+			},
+			nbformat: 4,
+			nbformat_minor: 2
+		};
+		let markdownNotebookContent = JSON.stringify(expectedNotebookMarkdownContent);
+		// verify that notebooks support markdown cells
+		let notebook = await contentManager.loadFromContentString(markdownNotebookContent);
+		// assert that markdown cell is supported by
+		// verifying the notebook matches the expectedNotebookMarkdownContent format
+		assert.equal(notebook.cells.length, 1, 'The number of cells should be equal to 1');
+		assert.equal(notebook.cells[0].cell_type, CellTypes.Markdown, 'The cell type should be markdown');
+		assert.equal(notebook.cells[0].source, expectedNotebookMarkdownContent.cells[0].source, 'The content of the cell must match the expectedNotebookMarkdownContent');
+	});
+
+	test('Should allow stream for output types', async function (): Promise<void> {
+		let expectedNotebookStreamOutputContent: nb.INotebookContents = {
+			cells: [{
+				cell_type: CellTypes.Code,
+				source: [],
+				metadata: { language: 'python' },
+				execution_count: 1,
+				outputs: [
+					<nb.IStreamResult>{
+						output_type: 'stream',
+						text: 'Select * FROM database WHERE x = 0  \nSelect * FROM database WHERE x = 0\n'
+					}
+				]
+			}],
+			metadata: {
+				kernelspec: {
+					name: 'Python 3',
+					language: 'python3'
+				}
+			},
+			nbformat: 4,
+			nbformat_minor: 2
+		};
+		let streamOutputContent = JSON.stringify(expectedNotebookStreamOutputContent);
+		// Verify that the stream output type is supported
+		let notebook = await contentManager.loadFromContentString(streamOutputContent);
+		assert.equal(notebook.cells[0].outputs[0].output_type, 'stream', 'Cell output from notebook should be stream');
+		assert.equal(notebook.cells[0].cell_type, expectedNotebookStreamOutputContent.cells[0].cell_type, 'Cell type of notebook should match the expectedNotebookStreamOutputContent');
 	});
 });