feat: Implement basic general folder support (#2051)

- Related: #1748

tests/ha/has-hass-connection-changed.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from 'vitest';
+import { hasHAConnectionStateChanged } from '../../src/ha/has-hass-connection-changed';
+import { createHASS } from '../test-utils';
+
+describe('hasHAConnectionStateChanged', () => {
+  it('returns false if both oldHass and newHass are undefined', () => {
+    expect(hasHAConnectionStateChanged()).toBe(false);
+  });
+
+  it('returns false if both oldHass and newHass are null', () => {
+    expect(hasHAConnectionStateChanged(null, null)).toBe(false);
+  });
+
+  it('returns false if both oldHass and newHass are the same object', () => {
+    const hass = createHASS();
+    expect(hasHAConnectionStateChanged(hass, hass)).toBe(false);
+  });
+
+  it('returns false if both oldHass.connected and newHass.connected are the same', () => {
+    const oldHass = createHASS();
+    const newHass = createHASS();
+    oldHass.connected = true;
+    newHass.connected = true;
+    expect(hasHAConnectionStateChanged(oldHass, newHass)).toBe(false);
+  });
+
+  it('returns true if oldHass.connected and newHass.connected are different', () => {
+    const oldHass = createHASS();
+    const newHass = createHASS();
+    oldHass.connected = true;
+    newHass.connected = false;
+    expect(hasHAConnectionStateChanged(oldHass, newHass)).toBe(true);
+  });
+});