[CHORE] message-parser: add test coverage for isNodeOfType guard

Author: Harshith1702

.changeset/message-parser-guards-coverage.md

@@ -0,0 +1,5 @@
+---
+"@rocket.chat/message-parser": patch
+---
+
+Add test coverage for isNodeOfType guard bringing branch coverage to 100%

packages/message-parser/tests/guards.test.ts

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+import { isNodeOfType } from '../src/guards';
+
+describe('isNodeOfType', () => {
+	it('returns true when value has matching type', () => {
+		expect(isNodeOfType({ type: 'PLAIN_TEXT', value: 'hi' }, 'PLAIN_TEXT')).toBe(true);
+	});
+
+	it('returns false for null', () => {
+		expect(isNodeOfType(null, 'PLAIN_TEXT')).toBe(false);
+	});
+
+	it('returns false for non-object', () => {
+		expect(isNodeOfType('string', 'PLAIN_TEXT')).toBe(false);
+	});
+
+	it('returns false when type does not match', () => {
+		expect(isNodeOfType({ type: 'BOLD', value: [] }, 'PLAIN_TEXT')).toBe(false);
+	});
+
+	it('returns false when type property is missing', () => {
+		expect(isNodeOfType({ value: 'hi' }, 'PLAIN_TEXT')).toBe(false);
+	});
+
+	it('returns false for undefined', () => {
+		expect(isNodeOfType(undefined, 'PLAIN_TEXT')).toBe(false);
+	});
+});