add tooltip test

src/main/javascript/components/tooltip/tooltip.spec.ts

@@ -0,0 +1,76 @@
+import { afterEach, describe, expect, test, vi } from "vitest";
+import { Tooltip } from "./tooltip";
+import type { Instance } from "@popperjs/core";
+import * as popper from "@popperjs/core";
+
+vi.spyOn(popper, "createPopper");
+
+describe("tooltip", () => {
+  afterEach(() => {
+    while (document.body.firstChild) {
+      document.body.firstChild.remove();
+    }
+  });
+
+  test("sets role attribute", () => {
+    document.body.innerHTML = '<div id="parent"></div>';
+
+    const paragraph = document.createElement("p");
+    paragraph.textContent = "tooltip text";
+
+    const tooltip = new Tooltip();
+    expect(tooltip.getAttribute("role")).toBe("tooltip");
+  });
+
+  test("initializes tooltip on mount", () => {
+    document.body.innerHTML = '<div id="parent"></div>';
+    const tooltip = anyTooltip();
+
+    expect(popper.createPopper).not.toHaveBeenCalled();
+
+    document.querySelector("#parent").append(tooltip);
+    expect(popper.createPopper).toHaveBeenCalled();
+  });
+
+  test.each([["mouseenter"], ["focus"]])("shows tooltip on %s", (eventName) => {
+    const popperInstance = {
+      update: vi.fn(),
+    };
+    vi.mocked(popper.createPopper).mockReturnValue(
+      popperInstance as unknown as Instance,
+    );
+
+    document.body.innerHTML = '<div id="parent"></div>';
+    const root = document.querySelector("#parent");
+    const tooltip = anyTooltip();
+    root.append(tooltip);
+
+    expect(tooltip.dataset.show).not.toBeDefined();
+
+    root.dispatchEvent(new Event(eventName));
+    expect(tooltip.dataset.show).toBeDefined();
+    expect(popperInstance.update).toHaveBeenCalledOnce();
+  });
+
+  test.each([["mouseleave"], ["blur"]])("hides tooltip on %s", (eventName) => {
+    document.body.innerHTML = '<div id="parent"></div>';
+    const root = document.querySelector("#parent");
+    const tooltip = anyTooltip();
+    root.append(tooltip);
+
+    tooltip.dataset.show = "";
+
+    root.dispatchEvent(new Event(eventName));
+    expect(tooltip.dataset.show).not.toBeDefined();
+  });
+});
+
+function anyTooltip() {
+  const paragraph = document.createElement("p");
+  paragraph.textContent = "tooltip text";
+
+  const tooltip = new Tooltip();
+  tooltip.append(paragraph);
+
+  return tooltip;
+}