MySQL E2E test: wait for dataset and table view before assertions (#21115)

frontend/test/metabase/scenarios/native/native-mysql.cy.spec.js

@@ -5,6 +5,7 @@ const MYSQL_DB_NAME = "QA MySQL8";
 describe("scenatios > question > native > mysql", () => {
   beforeEach(() => {
     cy.intercept("POST", "/api/card").as("createQuestion");
+    cy.intercept("POST", "/api/dataset").as("dataset");
 
     restore("mysql-8");
     cy.signInAsAdmin();
@@ -24,9 +25,13 @@ describe("scenatios > question > native > mysql", () => {
     );
     cy.get(".NativeQueryEditor .Icon-play").click();
 
+    cy.wait("@dataset");
+
     cy.get(".Visualization").as("queryPreview");
 
-    cy.get("@queryPreview").contains("Widget");
+    cy.get("@queryPreview")
+      .should("be.visible")
+      .contains("Widget");
 
     // Filter by Product ID = 1 (its category is Gizmo)
     cy.findByPlaceholderText(/Id/i)
@@ -45,6 +50,10 @@ describe("scenatios > question > native > mysql", () => {
   it("can save a native MySQL query", () => {
     cy.get(".ace_content").type(`SELECT * FROM ORDERS`);
     cy.get(".NativeQueryEditor .Icon-play").click();
+
+    cy.wait("@dataset");
+    cy.findByTextEnsureVisible("SUBTOTAL");
+
     cy.contains("37.65");
 
     // Save the query
@@ -62,7 +71,7 @@ describe("scenatios > question > native > mysql", () => {
 
     cy.wait("@createQuestion");
 
-    cy.findByText("Not now").click();
+    cy.findByTextEnsureVisible("Not now").click();
 
     cy.contains("Save").should("not.exist");
     cy.url().should("match", /\/question\/\d+-[a-z0-9-]*$/);