[ADF-2131] Search sorting (#3334)

* sorting configuration

* detect primary sorting and use with document list

* search results sorting

* docs update

* unit tests and code updates

* update code

* update code

* generic sorting picker, test updates

* ability to switch off client side sorting

* update docs for document list

lib/content-services/document-list/data/share-datatable-adapter.spec.ts

@@ -32,6 +32,31 @@ describe('ShareDataTableAdapter', () => {
         spyOn(documentListService, 'getDocumentThumbnailUrl').and.returnValue(imageUrl);
     });
 
+    it('should use client sorting by default', () => {
+        const adapter = new ShareDataTableAdapter(documentListService, []);
+        expect(adapter.sortingMode).toBe('client');
+    });
+
+    it('should not be case sensitive for sorting mode value', () => {
+        const adapter = new ShareDataTableAdapter(documentListService, []);
+
+        adapter.sortingMode = 'CLIENT';
+        expect(adapter.sortingMode).toBe('client');
+
+        adapter.sortingMode = 'SeRvEr';
+        expect(adapter.sortingMode).toBe('server');
+    });
+
+    it('should fallback to client sorting for unknown values', () => {
+        const adapter = new ShareDataTableAdapter(documentListService, []);
+
+        adapter.sortingMode = 'SeRvEr';
+        expect(adapter.sortingMode).toBe('server');
+
+        adapter.sortingMode = 'quantum';
+        expect(adapter.sortingMode).toBe('client');
+    });
+
     it('should setup rows and columns with constructor', () => {
         let schema = [<DataColumn> {}];
         let adapter = new ShareDataTableAdapter(documentListService, schema);