[Init] Initial commit - NetMesh terminal manager

application/state/sftp/useSftpTabsState.test.ts

@@ -0,0 +1,58 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { createEmptyPane } from "./types.ts";
+import {
+  closeSftpTabStateImmediately,
+  removeSftpTabFromState,
+} from "./useSftpTabsState.ts";
+
+test("closing the active SFTP tab selects its nearest remaining neighbor", () => {
+  const left = createEmptyPane("left");
+  const middle = createEmptyPane("middle");
+  const right = createEmptyPane("right");
+
+  assert.deepEqual(removeSftpTabFromState({
+    tabs: [left, middle, right],
+    activeTabId: middle.id,
+  }, middle.id), {
+    tabs: [left, right],
+    activeTabId: right.id,
+  });
+});
+
+test("closing a background SFTP tab preserves the active tab", () => {
+  const active = createEmptyPane("active");
+  const background = createEmptyPane("background");
+
+  assert.deepEqual(removeSftpTabFromState({
+    tabs: [active, background],
+    activeTabId: active.id,
+  }, background.id), {
+    tabs: [active],
+    activeTabId: active.id,
+  });
+});
+
+test("closing a tab updates the live ref before React commits the state update", () => {
+  const closing = createEmptyPane("closing");
+  const remaining = createEmptyPane("remaining");
+  const initial = {
+    tabs: [closing, remaining],
+    activeTabId: closing.id,
+  };
+  const tabsRef = { current: initial };
+  let queuedUpdate: ((prev: typeof initial) => typeof initial) | undefined;
+
+  closeSftpTabStateImmediately({
+    tabsRef,
+    tabId: closing.id,
+    setTabs: (update) => {
+      queuedUpdate = update;
+    },
+  });
+
+  assert.deepEqual(tabsRef.current.tabs, [remaining]);
+  assert.equal(tabsRef.current.activeTabId, remaining.id);
+  assert.deepEqual(queuedUpdate?.(initial), tabsRef.current);
+});