added unit testing, and started implementing unit tests...phew

node_modules/get-stream/index.js

@@ -0,0 +1,50 @@
+'use strict';
+const pump = require('pump');
+const bufferStream = require('./buffer-stream');
+
+class MaxBufferError extends Error {
+	constructor() {
+		super('maxBuffer exceeded');
+		this.name = 'MaxBufferError';
+	}
+}
+
+function getStream(inputStream, options) {
+	if (!inputStream) {
+		return Promise.reject(new Error('Expected a stream'));
+	}
+
+	options = Object.assign({maxBuffer: Infinity}, options);
+
+	const {maxBuffer} = options;
+
+	let stream;
+	return new Promise((resolve, reject) => {
+		const rejectPromise = error => {
+			if (error) { // A null check
+				error.bufferedData = stream.getBufferedValue();
+			}
+			reject(error);
+		};
+
+		stream = pump(inputStream, bufferStream(options), error => {
+			if (error) {
+				rejectPromise(error);
+				return;
+			}
+
+			resolve();
+		});
+
+		stream.on('data', () => {
+			if (stream.getBufferedLength() > maxBuffer) {
+				rejectPromise(new MaxBufferError());
+			}
+		});
+	}).then(() => stream.getBufferedValue());
+}
+
+module.exports = getStream;
+module.exports.buffer = (stream, options) => getStream(stream, Object.assign({}, options, {encoding: 'buffer'}));
+module.exports.array = (stream, options) => getStream(stream, Object.assign({}, options, {array: true}));
+module.exports.MaxBufferError = MaxBufferError;