flow like the river

VISUALIZACION/node_modules/to-arraybuffer/test.js

@@ -0,0 +1,57 @@
+var Buffer = require('buffer').Buffer
+var test = require('tape')
+
+var toArrayBuffer = require('.')
+
+function elementsEqual (ab, buffer) {
+	var view = new Uint8Array(ab)
+	for (var i = 0; i < view.length; i++) {
+		if (view[i] !== buffer[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+test('Basic behavior', function (t) {
+	var buf = new Buffer(10)
+	for (var i = 0; i < 10; i++) {
+		buf[i] = i
+	}
+
+	var ab = toArrayBuffer(buf)
+
+	t.equals(ab.byteLength, 10, 'correct length')
+	t.ok(elementsEqual(ab, buf), 'elements equal')
+	t.end()
+})
+
+test('Behavior when input is a subarray 1', function (t) {
+	var origBuf = new Buffer(10)
+	for (var i = 0; i < 10; i++) {
+		origBuf[i] = i
+	}
+	var buf = origBuf.slice(1)
+
+	var ab = toArrayBuffer(buf)
+
+	t.equals(ab.byteLength, 9, 'correct length')
+	t.ok(elementsEqual(ab, buf), 'elements equal')
+	t.notOk(ab === buf.buffer, 'the underlying ArrayBuffer is not returned when incorrect')
+	t.end()
+})
+
+test('Behavior when input is a subarray 2', function (t) {
+	var origBuf = new Buffer(10)
+	for (var i = 0; i < 10; i++) {
+		origBuf[i] = i
+	}
+	var buf = origBuf.slice(0, 9)
+
+	var ab = toArrayBuffer(buf)
+
+	t.equals(ab.byteLength, 9, 'correct length')
+	t.ok(elementsEqual(ab, buf), 'elements equal')
+	t.notOk(ab === buf.buffer, 'the underlying ArrayBuffer is not returned when incorrect')
+	t.end()
+})