[Init] Initial commit - NetMesh terminal manager

lib/tabInteractions.test.ts

@@ -0,0 +1,66 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import type React from "react";
+
+import {
+  MIDDLE_MOUSE_BUTTON,
+  handleTabMiddleClickClose,
+  handleTabMiddleMouseDown,
+} from "./tabInteractions.ts";
+
+interface FakeMouseEvent {
+  button: number;
+  preventDefault: () => void;
+  stopPropagation: () => void;
+}
+
+const makeEvent = (button: number) => {
+  const calls = { preventDefault: 0, stopPropagation: 0 };
+  const event = {
+    button,
+    preventDefault: () => {
+      calls.preventDefault++;
+    },
+    stopPropagation: () => {
+      calls.stopPropagation++;
+    },
+  } satisfies FakeMouseEvent;
+  return { event: event as unknown as React.MouseEvent, calls };
+};
+
+test("handleTabMiddleClickClose closes the tab on a middle click", () => {
+  let closed = 0;
+  const { event, calls } = makeEvent(MIDDLE_MOUSE_BUTTON);
+
+  handleTabMiddleClickClose(event, () => {
+    closed++;
+  });
+
+  assert.equal(closed, 1);
+  assert.equal(calls.preventDefault, 1);
+  assert.equal(calls.stopPropagation, 1);
+});
+
+test("handleTabMiddleClickClose ignores left and right clicks", () => {
+  for (const button of [0, 2]) {
+    let closed = 0;
+    const { event, calls } = makeEvent(button);
+
+    handleTabMiddleClickClose(event, () => {
+      closed++;
+    });
+
+    assert.equal(closed, 0, `button ${button} must not close the tab`);
+    assert.equal(calls.preventDefault, 0);
+  }
+});
+
+test("handleTabMiddleMouseDown suppresses autoscroll only for the middle button", () => {
+  const middle = makeEvent(MIDDLE_MOUSE_BUTTON);
+  handleTabMiddleMouseDown(middle.event);
+  assert.equal(middle.calls.preventDefault, 1);
+
+  const left = makeEvent(0);
+  handleTabMiddleMouseDown(left.event);
+  assert.equal(left.calls.preventDefault, 0);
+});