Updated the files.

my-app/node_modules/wcwidth/test/index.js

@@ -0,0 +1,64 @@
+"use strict"
+
+var wcwidth = require('../')
+var test = require('tape')
+
+test('handles regular strings', function(t) {
+  t.strictEqual(wcwidth('abc'), 3)
+  t.end()
+})
+
+test('handles multibyte strings', function(t) {
+  t.strictEqual(wcwidth('字的模块'), 8)
+  t.end()
+})
+
+test('handles multibyte characters mixed with regular characters', function(t) {
+  t.strictEqual(wcwidth('abc 字的模块'), 12)
+  t.end()
+})
+
+test('ignores control characters e.g. \\n', function(t) {
+  t.strictEqual(wcwidth('abc\n字的模块\ndef'), 14)
+  t.end()
+})
+
+test('ignores bad input', function(t) {
+  t.strictEqual(wcwidth(''), 0)
+  t.strictEqual(wcwidth(3), 0)
+  t.strictEqual(wcwidth({}), 0)
+  t.strictEqual(wcwidth([]), 0)
+  t.strictEqual(wcwidth(), 0)
+  t.end()
+})
+
+test('ignores nul (charcode 0)', function(t) {
+  t.strictEqual(wcwidth(String.fromCharCode(0)), 0)
+  t.end()
+})
+
+test('ignores nul mixed with chars', function(t) {
+  t.strictEqual(wcwidth('a' + String.fromCharCode(0) + '\n字的'), 5)
+  t.end()
+})
+
+test('can have custom value for nul', function(t) {
+  t.strictEqual(wcwidth.config({
+    nul: 10
+  })(String.fromCharCode(0) + 'a字的'), 15)
+  t.end()
+})
+
+test('can have custom control char value', function(t) {
+  t.strictEqual(wcwidth.config({
+    control: 1
+  })('abc\n字的模块\ndef'), 16)
+  t.end()
+})
+
+test('negative custom control chars == -1', function(t) {
+  t.strictEqual(wcwidth.config({
+    control: -1
+  })('abc\n字的模块\ndef'), -1)
+  t.end()
+})