add tests.

test/widget-prompt.js

@@ -0,0 +1,90 @@
+var blessed = require('../');
+
+var screen = blessed.screen({
+  tput: true,
+  smartCSR: true,
+  dump: __dirname + '/logs/prompt.log',
+  autoPadding: true
+});
+
+var prompt = blessed.prompt({
+  parent: screen,
+  border: {
+    type: 'ascii'
+  },
+  height: 'shrink',
+  width: 'half',
+  top: 'center',
+  left: 'center',
+  label: ' {blue-fg}Prompt{/blue-fg} ',
+  tags: true,
+  keys: true,
+  vi: true
+});
+
+var question = blessed.question({
+  parent: screen,
+  border: {
+    type: 'ascii'
+  },
+  height: 'shrink',
+  width: 'half',
+  top: 'center',
+  left: 'center',
+  label: ' {blue-fg}Question{/blue-fg} ',
+  tags: true,
+  keys: true,
+  vi: true
+});
+
+var msg = blessed.message({
+  parent: screen,
+  border: {
+    type: 'ascii'
+  },
+  height: 'shrink',
+  width: 'half',
+  top: 'center',
+  left: 'center',
+  label: ' {blue-fg}Message{/blue-fg} ',
+  tags: true,
+  keys: true,
+  hidden: true,
+  vi: true
+});
+
+var loader = blessed.loading({
+  parent: screen,
+  border: {
+    type: 'ascii'
+  },
+  height: 'shrink',
+  width: 'half',
+  top: 'center',
+  left: 'center',
+  label: ' {blue-fg}Loader{/blue-fg} ',
+  tags: true,
+  keys: true,
+  hidden: true,
+  vi: true
+});
+
+prompt.type('Question?', '', function(err, value) {
+  question.ask('Question?', function(err, value) {
+    msg.display('Hello world!', 3, function(err) {
+      msg.display('Hello world again!', -1, function(err) {
+        loader.load('Loading...');
+        setTimeout(function() {
+          loader.stop();
+          process.exit(0);
+        }, 3000);
+      });
+    });
+  });
+});
+
+screen.key('q', function() {
+  process.exit(0);
+});
+
+screen.render();