Add TestBase.take_screenshot(window=None) in bitmessageqt.tests:

it shows specified window (or the main window), execs the app
and saves screenshot in png file in the appdata with full test name
in the file name.

Used it in TestUISignaler.test_updateStatusBar and TestSupport.

src/bitmessageqt/tests/main.py

@@ -2,6 +2,7 @@
 
 import Queue
 import sys
+import os
 import unittest
 
 from PyQt4 import QtCore, QtGui
@@ -23,6 +24,22 @@ class TestBase(unittest.TestCase):
             self.window = bitmessageqt.MyForm()
             self.window.appIndicatorInit(self.app)
 
+    def take_screenshot(self, window=None):
+        """Take a screenshot of the *window* or main window if not set"""
+        def save_screenshot():
+            """Save screenshot and quit app clause"""
+            screenshot = QtGui.QPixmap.grabWindow(
+                self.app.desktop().winId())
+            screenshot.save(os.path.join(
+                bitmessageqt.state.appdata, '%s.png' % self.id()))
+            self.app.quit()
+
+        timer = QtCore.QTimer()
+        timer.timeout.connect(save_screenshot)
+        timer.start(200)
+        (window or self.window).show()
+        self.app.exec_()
+
     def tearDown(self):
         # self.app.deleteLater()
         while True:
@@ -55,6 +72,4 @@ class TestUISignaler(TestBase):
                 _translate("test", "Testing updateStatusBar..."), 1)
         ))
 
-        QtCore.QTimer.singleShot(60, self.app.quit)
-        self.app.exec_()
-        # self.app.processEvents(QtCore.QEventLoop.AllEvents, 60)
+        self.take_screenshot()

src/bitmessageqt/tests/support.py

@@ -31,3 +31,5 @@ class TestSupport(TestBase):
             ui.lineEditSubject.text(), self.SUPPORT_SUBJECT)
         self.assertIn(
             sys.version, ui.textEditMessage.toPlainText())
+
+        self.take_screenshot()