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packages/nodes-base/nodes/RespondToWebhook/test/binary.test.ts

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+import type { IDataObject } from 'n8n-workflow';
+import { BINARY_ENCODING } from 'n8n-workflow';
+
+import { getBinaryResponse } from '../utils/binary';
+
+describe('getBinaryResponse', () => {
+	it('returns { binaryData } when binaryData.id is present', () => {
+		const binaryData = {
+			id: '123',
+			data: '<h1>Hello</h1>',
+			mimeType: 'text/html',
+		};
+		const headers: IDataObject = {};
+
+		const result = getBinaryResponse(binaryData, headers);
+
+		expect(result).toEqual({ binaryData });
+		expect(headers['content-type']).toBe('text/html');
+	});
+
+	it('returns { binaryData } when binaryData.id is present and mimeType is not text/html', () => {
+		const binaryData = {
+			id: '123',
+			data: 'some-binary-data',
+			mimeType: 'application/octet-stream',
+		};
+		const headers: IDataObject = {};
+
+		const result = getBinaryResponse(binaryData, headers);
+
+		expect(result).toEqual({ binaryData });
+		expect(headers['content-type']).toBe('application/octet-stream');
+	});
+
+	it('returns Buffer when binaryData.id is not present', () => {
+		const binaryData = {
+			data: '<h1>Hello</h1>',
+			mimeType: 'text/html',
+		};
+		const headers: IDataObject = {};
+
+		const result = getBinaryResponse(binaryData, headers);
+
+		expect(Buffer.isBuffer(result)).toBe(true);
+		expect(result.toString()).toBe(Buffer.from(binaryData.data, BINARY_ENCODING).toString());
+		expect(headers['content-type']).toBe('text/html');
+	});
+
+	it('returns Buffer when binaryData.id is not present and mimeType is not text/html', () => {
+		const binaryData = {
+			data: 'some-binary-data',
+			mimeType: 'application/octet-stream',
+		};
+		const headers: IDataObject = {};
+
+		const result = getBinaryResponse(binaryData, headers);
+
+		expect(Buffer.isBuffer(result)).toBe(true);
+		expect(result.toString()).toBe(Buffer.from(binaryData.data, BINARY_ENCODING).toString());
+		expect(headers['content-type']).toBe('application/octet-stream');
+		expect(headers['content-length']).toBe(Buffer.from(binaryData.data, BINARY_ENCODING).length);
+	});
+});