Created cypress test for center align attribute on Desktop writer

Change-Id: I81e9765f7c2aa6811ec6ae4f15d37c9ba3d7532c
Signed-off-by: Ezinne Nnamani <nnamani.ezinne@collabora.com>

cypress_test/integration_tests/desktop/writer/top_toolbar_spec.js

@@ -14,7 +14,7 @@ describe('Top toolbar tests.', function() {
 	afterEach(function() {
 		helper.afterAll(testFileName);
 	});
-
+	
 	it('Apply highlight color.', function() {
 		cy.get('#tb_editbar_item_backcolor')
 			.click();
@@ -150,6 +150,16 @@ describe('Top toolbar tests.', function() {
 			.should('have.attr', 'align', 'left');
 	});
 
+	it('Apply center alignment.', function() {
+		cy.get('#tb_editbar_item_centerpara')
+			.click();
+
+		helper.reselectAllText();
+
+		cy.get('#copy-paste-container p')
+			.should('have.attr', 'align', 'center');
+	});
+
 	it('Insert comment.', function() {
 		cy.get('#toolbar-up .w2ui-scroll-right')
 			.click();