Add tooltip tests to prove usePlaceholder functionality (CMEM-6871)

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ## [Unreleased]
 
+### Added
+
+-   `<Tooltip />`
+    -   prove useage of `usePlaceholder` by jest test coverage
+
 ## [24.4.1] - 2025-08-25
 
 ### Fixed

src/components/Tooltip/Tooltip.stories.tsx

@@ -2,6 +2,7 @@ import React from "react";
 import { loremIpsum } from "react-lorem-ipsum";
 import { OverlaysProvider } from "@blueprintjs/core";
 import { Meta, StoryFn } from "@storybook/react";
+import { fn } from "@storybook/test";
 
 import { Tooltip } from "../../index";
 
@@ -34,6 +35,7 @@ Default.args = {
     children: "hover me",
     content: testContent,
     addIndicator: true,
+    onOpening: fn(),
 };
 
 export const MarkdownSupport = Template.bind({});

src/components/Tooltip/Tooltip.test.tsx

@@ -0,0 +1,63 @@
+import React from "react";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+
+import "@testing-library/jest-dom";
+
+import { CLASSPREFIX as eccgui } from "../../configuration/constants";
+
+import Tooltip from "./Tooltip";
+import { Default as TooltipStory } from "./Tooltip.stories";
+
+const checkForPlaceholderClass = (container: HTMLElement, tobe: number) => {
+    expect(container.getElementsByClassName(`${eccgui}-tooltip__wrapper--placeholder`).length).toBe(tobe);
+};
+
+describe("Tooltip", () => {
+    it("should render placeholder automatically for text tooltip", () => {
+        const { container } = render(<Tooltip {...TooltipStory.args} content="this is a simple text tooltip" />);
+        checkForPlaceholderClass(container, 1);
+    });
+    it("should render no placeholder automatically for html tooltip", () => {
+        const { container } = render(
+            <Tooltip {...TooltipStory.args} content={<div>this is a simple text tooltip</div>} />
+        );
+        checkForPlaceholderClass(container, 0);
+    });
+    it("should render placeholder when `usePlaceholder===true`", () => {
+        const { container } = render(
+            <Tooltip {...TooltipStory.args} content={<div>this is a simple text tooltip</div>} usePlaceholder={true} />
+        );
+        checkForPlaceholderClass(container, 1);
+    });
+    it("should render no placeholder when `usePlaceholder===false`", () => {
+        const { container } = render(
+            <Tooltip {...TooltipStory.args} content="this is a simple text tooltip" usePlaceholder={false} />
+        );
+        checkForPlaceholderClass(container, 0);
+    });
+    it("should be displayed on first mouse hover when no placeholder is used", async () => {
+        const { container } = render(<Tooltip {...TooltipStory.args} usePlaceholder={false} />);
+        fireEvent.mouseEnter(container.getElementsByClassName(`${eccgui}-tooltip__wrapper`)[0]);
+        expect(await screen.findByText(TooltipStory.args.content)).toBeVisible();
+    });
+    it("should not be displayed on first mouse hover when placeholder is used but placeholder markup is swapped", async () => {
+        const { container } = render(<Tooltip {...TooltipStory.args} usePlaceholder={true} />);
+        fireEvent.mouseEnter(container.getElementsByClassName(`${eccgui}-tooltip__wrapper--placeholder`)[0]);
+        checkForPlaceholderClass(container, 1);
+        await waitFor(() => {
+            expect(screen.queryAllByText(TooltipStory.args.content)).toHaveLength(0);
+            checkForPlaceholderClass(container, 0);
+        });
+    });
+    it("should be displayed on two continues mouse hover when placeholder is used", async () => {
+        const { container } = render(<Tooltip {...TooltipStory.args} usePlaceholder={true} />);
+        fireEvent.mouseEnter(container.getElementsByClassName(`${eccgui}-tooltip__wrapper`)[0]);
+        checkForPlaceholderClass(container, 1);
+        await waitFor(async () => {
+            expect(screen.queryAllByText(TooltipStory.args.content)).toHaveLength(0);
+            checkForPlaceholderClass(container, 0);
+            fireEvent.mouseOver(container.getElementsByClassName(`${eccgui}-tooltip__wrapper`)[0]);
+            expect(await screen.findByText(TooltipStory.args.content)).toBeVisible();
+        });
+    });
+});

src/components/Tooltip/Tooltip.tsx

@@ -199,7 +199,9 @@ export const Tooltip = ({
             targetProps={
                 {
                     ...otherTooltipProps.targetProps,
-                    "data-postplaceholder": `id${eventMemory.current}${searchId.current}`,
+                    "data-postplaceholder": eventMemory.current
+                        ? `id${eventMemory.current}${searchId.current}`
+                        : undefined,
                 } as React.HTMLProps<HTMLElement>
             }
         >