Implement mockable mainModule.

Closes #185.

arguable.js

@@ -62,16 +62,16 @@ module.exports = function () {
         var ee = options.events
         if (ee == null) {
             ee = new events.EventEmitter
-            ee.mainModule == options.mainModule || process.mainModule
-            ee.connected == ('connected' in options) ? options.connected : true
+            ee.mainModule = options.mainModule || process.mainModule
+            ee.connected = ('connected' in options) ? options.connected : true
             ee.disconnect = function () { this.connected = false }
         }
         var program = new Program(usage, parameters, {
             module: module,
             stdout: createStream(options.stdout),
             stdin: createStream(options.stdin),
             stderr: createStream(options.stderr),
-            process: ee,
+            events: ee,
             send: send || null,
             env: options.env || {}
         })

program.js

@@ -244,6 +244,10 @@ Program.prototype.__defineGetter__('connected', function () {
     return this._process.connected
 })
 
+Program.prototype.__defineGetter__('mainModule', function () {
+    return this._process.mainModule
+})
+
 // Format a message using the string tables provided in the usage message.
 Program.prototype.format = function (key) {
     return this._usage.format(this.lang, key, slice.call(arguments, 1))
@@ -336,7 +340,7 @@ Program.prototype.delegate = cadence(function (async, format, argv) {
         env: this.env,
         stdin: this.stdin,
         stderr: this.stderr,
-        events: this,
+        process: this,
         send: this.send
     }, async())
 })

t/fixtures/main.js

@@ -0,0 +1,3 @@
+require('../..')(module, function (program, callback) {
+    callback(null, program.mainModule)
+})

t/index.t.js

@@ -1,10 +1,11 @@
-require('proof')(9, require('cadence')(prove))
+require('proof')(11, require('cadence')(prove))
 
 function prove (async, assert) {
     var echo1 = require('./fixtures/echo-1')
     var echo2 = require('./fixtures/echo-2')
     var send = require('./fixtures/send')
     var parameters = require('./fixtures/parameters')
+    var main = require('./fixtures/main')
     var stream = require('stream')
     var events = require('events')
     var stdout
@@ -39,5 +40,11 @@ function prove (async, assert) {
         parameters([[{ three: 3 }]], {}, async())
     }, function (result) {
         assert(result, { one: 1, two: 2, three: 3 }, 'nested array argument')
+        main([], {}, async())
+    }, function (result) {
+        assert(result === process.mainModule, 'main module')
+        main([], { mainModule: main }, async())
+    }, function (result) {
+        assert(result === main, 'main module')
     })
 }