Implement disconnect.

program.js

@@ -142,9 +142,7 @@ Program.prototype.once = function (event, listener) {
 }
 
 Program.prototype.disconnect = function () {
-    if (this._process.connected) {
-        this._process.disconnect()
-    }
+    this._process.disconnect()
 }
 
 Program.prototype.__defineSetter__('exitCode', function (exitCode) {
@@ -155,6 +153,10 @@ Program.prototype.__defineGetter__('exitCode', function () {
     return this._process.exitCode
 })
 
+Program.prototype.__defineGetter__('connected', function () {
+    return this._process.connected
+})
+
 Program.prototype._hook = function (event) {
     if (!this._hooked[event]) {
         this._process.on(event, function () {

t/program.t.js

@@ -1,4 +1,4 @@
-require('proof')(39, require('cadence')(prove))
+require('proof')(42, require('cadence')(prove))
 
 /*
     ___ usage ___ en_US ___
@@ -36,6 +36,16 @@ function prove (async, assert) {
         if (error) throw error
         assert(io.events.exitCode, 1, 'exit non-zero')
     })
+    createProgram(__filename, {}, [], io = {
+        events: { connected: true, disconnect: function () { this.connected = false } }
+    }, cadence(function (async, program) {
+        assert(program.connected, 'connected')
+        program.disconnect()
+        assert(!program.connected, 'not connected')
+    }), function (error) {
+        if (error) throw error
+        assert(!io.events.connected, 'exit not connected')
+    })
     createProgram(__filename, {}, [], {}, cadence(function (async, program) {
         throw new Error('raw')
     }), function (error) {