Upload test data files with Newman

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// the filename is sample-file.txt
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{
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	"info": {
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		"_postman_id": "9dbfcf22-fdf4-f328-e440-95dbd8e4cfbb",
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		"name": "file-upload",
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		"description": "A set of `POST` requests to upload files as form data fields",
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		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
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	},
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	"item": [
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		{
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			"name": "Form data upload",
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			"event": [
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				{
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					"listen": "test",
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					"script": {
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						"exec": [
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							"const uploadedFile = pm.response.json()?.files['sample-file.txt'];",
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							"",
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							"pm.test(\"Status code is 200\", () => pm.response.to.have.status(200));",
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							"pm.test('File was uploaded correctly', () => pm.expect(uploadedFile).to.match(/^data:application\\/octet-stream;base64/));"
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						],
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						"type": "text/javascript",
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						"packages": {}
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					}
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				}
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			],
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			"request": {
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				"method": "POST",
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				"header": [],
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				"body": {
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					"mode": "formdata",
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					"formdata": [
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						{
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							"key": "file",
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							"type": "file",
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							"src": "sample-file.txt"
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						}
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					]
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				},
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				"url": {
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					"raw": "https://postman-echo.com/post",
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					"protocol": "https",
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					"host": [
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						"postman-echo",
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						"com"
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					],
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					"path": [
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						"post"
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					]
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				},
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				"description": "Uploads a file as a form data field to `https://postman-echo.com/post` using a `POST` request."
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			},
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			"response": []
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		}
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	]
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}