Refactor raised hand indicator and add tests.

src/reactions/RaisedHandIndicator.module.css

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+.raisedHandWidget {
+  display: flex;
+  background-color: var(--cpd-color-bg-subtle-primary);
+  border-radius: var(--cpd-radius-pill-effect);
+  color: var(--cpd-color-icon-secondary);
+  border: 1px solid var(--cpd-color-yellow-1200);
+}
+
+.raisedHandWidget > p {
+  padding: var(--cpd-space-2x);
+  margin-top: auto;
+  margin-bottom: auto;
+  width: 4em;
+}
+
+.raisedHand {
+  margin: var(--cpd-space-2x);
+  padding: var(--cpd-space-2x);
+  padding-block: var(--cpd-space-2x);
+  color: var(--cpd-color-icon-secondary);
+  background-color: var(--cpd-color-icon-secondary);
+  display: flex;
+  align-items: center;
+  border-radius: var(--cpd-radius-pill-effect);
+  user-select: none;
+  overflow: hidden;
+  box-shadow: var(--small-drop-shadow);
+  box-sizing: border-box;
+  max-inline-size: 100%;
+  max-width: fit-content;
+}
+
+.raisedHand > span {
+  width: var(--cpd-space-8x);
+  height: var(--cpd-space-8x);
+  display: inline-block;
+  text-align: center;
+  font-size: 22px;
+}

src/reactions/RaisedHandIndicator.test.tsx

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+/*
+Copyright 2024 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only
+Please see LICENSE in the repository root for full details.
+*/
+
+import { describe, expect, test } from "vitest";
+import { render, configure } from "@testing-library/react";
+
+import { RaisedHandIndicator } from "./RaisedHandIndicator";
+
+configure({
+  defaultHidden: true,
+});
+
+describe("RaisedHandIndicator", () => {
+  test("renders nothing when no hand has been raised", async () => {
+    const { container } = render(<RaisedHandIndicator />);
+    expect(container.firstChild).toBeNull();
+  });
+  test("renders an indicator when a hand has been raised", async () => {
+    const dateTime = new Date();
+    const { container } = render(
+      <RaisedHandIndicator raisedHandTime={dateTime} />,
+    );
+    expect(container.firstChild).toMatchSnapshot();
+  });
+  test("renders an indicator when a hand has been raised with the expected time", async () => {
+    const dateTime = new Date(new Date().getTime() - 60000);
+    const { container } = render(
+      <RaisedHandIndicator raisedHandTime={dateTime} />,
+    );
+    expect(container.firstChild).toMatchSnapshot();
+  });
+});

src/reactions/RaisedHandIndicator.tsx

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+import { useEffect, useState } from "react";
+import styles from "./RaisedHandIndicator.module.css";
+
+export function RaisedHandIndicator({
+  raisedHandTime,
+}: {
+  raisedHandTime?: Date;
+}) {
+  const [raisedHandDuration, setRaisedHandDuration] = useState("");
+
+  useEffect(() => {
+    if (!raisedHandTime) {
+      return;
+    }
+    const calculateTime = () => {
+      const totalSeconds = Math.ceil(
+        (new Date().getTime() - raisedHandTime.getTime()) / 1000,
+      );
+      const seconds = totalSeconds % 60;
+      const minutes = Math.floor(totalSeconds / 60);
+      setRaisedHandDuration(
+        `${minutes < 10 ? "0" : ""}${minutes}:${seconds < 10 ? "0" : ""}${seconds}`,
+      );
+    };
+    const to = setInterval(calculateTime, 1000);
+    calculateTime();
+    return (): void => clearInterval(to);
+  }, [setRaisedHandDuration, raisedHandTime]);
+
+  if (raisedHandTime) {
+    return (
+      <div className={styles.raisedHandWidget}>
+        <div className={styles.raisedHand}>
+          <span role="img" aria-label="raised hand">
+            ✋
+          </span>
+        </div>
+        <p>{raisedHandDuration}</p>
+      </div>
+    );
+  }
+
+  return null;
+}

src/reactions/__snapshots__/RaisedHandIndicator.test.tsx.snap

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+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`RaisedHandIndicator > renders an indicator when a hand has been raised 1`] = `
+<div
+  class="raisedHandWidget"
+>
+  <div
+    class="raisedHand"
+  >
+    <span
+      aria-label="raised hand"
+      role="img"
+    >
+      ✋
+    </span>
+  </div>
+  <p>
+    00:01
+  </p>
+</div>
+`;
+
+exports[`RaisedHandIndicator > renders an indicator when a hand has been raised with the expected time 1`] = `
+<div
+  class="raisedHandWidget"
+>
+  <div
+    class="raisedHand"
+  >
+    <span
+      aria-label="raised hand"
+      role="img"
+    >
+      ✋
+    </span>
+  </div>
+  <p>
+    01:01
+  </p>
+</div>
+`;