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

node_modules/require-main-filename/test.js

@@ -0,0 +1,36 @@
+/* global describe, it */
+
+var requireMainFilename = require('./')
+
+require('tap').mochaGlobals()
+require('chai').should()
+
+describe('require-main-filename', function () {
+  it('returns require.main.filename in normal circumstances', function () {
+    requireMainFilename().should.match(/test\.js/)
+  })
+
+  it('should use children[0].filename when running on iisnode', function () {
+    var main = {
+      filename: 'D:\\Program Files (x86)\\iisnode\\interceptor.js',
+      children: [ {filename: 'D:\\home\\site\\wwwroot\\server.js'} ]
+    }
+    requireMainFilename({
+      main: main
+    }).should.match(/server\.js/)
+  })
+
+  it('should not use children[0] if no children exist', function () {
+    var main = {
+      filename: 'D:\\Program Files (x86)\\iisnode\\interceptor.js',
+      children: []
+    }
+    requireMainFilename({
+      main: main
+    }).should.match(/interceptor\.js/)
+  })
+
+  it('should default to process.cwd() if require.main is undefined', function () {
+    requireMainFilename({}).should.match(/require-main-filename/)
+  })
+})