Index: src/sas/qtgui/Calculators/UnitTesting/DensityCalculatorTest.py
===================================================================
--- src/sas/qtgui/Calculators/UnitTesting/DensityCalculatorTest.py	(revision 83eb5208b8acb86b064162274de583670f72da47)
+++ src/sas/qtgui/Calculators/UnitTesting/DensityCalculatorTest.py	(revision 83eb5208b8acb86b064162274de583670f72da47)
@@ -0,0 +1,121 @@
+import sys
+import unittest
+import webbrowser
+
+from PyQt4 import QtGui
+from PyQt4.QtTest import QTest
+from PyQt4 import QtCore
+from mock import MagicMock
+
+####### TEMP
+import sas.qtgui.path_prepare
+#######
+
+# Local
+from sas.qtgui.Calculators.DensityPanel import DensityPanel
+from sas.qtgui.Calculators.DensityPanel import toMolarMass
+from sas.qtgui.Utilities.GuiUtils import FormulaValidator
+
+import sas.qtgui.Utilities.LocalConfig
+
+app = QtGui.QApplication(sys.argv)
+
+class ToMolarMassTest(unittest.TestCase):
+    """ Test the auxiliary conversion method"""
+    def testGoodEasy(self):
+        self.assertEqual(toMolarMass("H2"), "2.01588")
+
+    def testGoodComplex(self):
+        self.assertEqual(toMolarMass("H24O12C4C6N2Pu"), "608.304")
+
+    def testGoodComplex2(self):
+        self.assertEqual(toMolarMass("(H2O)0.5(D2O)0.5"), "19.0214")
+
+    def testBadInputInt(self):
+        self.assertEqual(toMolarMass(1), "")
+
+    def testBadInputStr(self):
+        self.assertEqual(toMolarMass("Im a bad string"), "")
+
+class DensityCalculatorTest(unittest.TestCase):
+    '''Test the DensityCalculator'''
+    def setUp(self):
+        '''Create the DensityCalculator'''
+        self.widget = DensityPanel(None)
+
+    def tearDown(self):
+        '''Destroy the DensityCalculator'''
+        self.widget.close()
+        self.widget = None
+
+    def testDefaults(self):
+        '''Test the GUI in its default state'''
+        self.assertIsInstance(self.widget, QtGui.QWidget)
+        self.assertEqual(self.widget.windowTitle(), "Density/Volume Calculator")
+        self.assertIsInstance(self.widget.ui.editMolecularFormula.validator(), FormulaValidator)
+        self.assertEqual(self.widget.ui.editMolecularFormula.styleSheet(), '')
+        self.assertEqual(self.widget.model.columnCount(), 1)
+        self.assertEqual(self.widget.model.rowCount(), 4)
+        self.assertEqual(self.widget.sizePolicy().Policy(), QtGui.QSizePolicy.Fixed)
+
+    def testSimpleEntry(self):
+        ''' Default compound calculations '''
+        self.widget.ui.editMolarVolume.insert("1.0")
+
+        self.widget.show()
+        # Send tab x3
+        key = QtCore.Qt.Key_Tab
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.NoModifier)
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.NoModifier)
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.NoModifier)
+        QTest.qWait(100)
+
+        # Assure the mass density field is set
+        self.assertEqual(self.widget.ui.editMassDensity.text(), '18.0153')
+
+        # Change mass density
+        self.widget.ui.editMassDensity.insert("16.0")
+        # Send shift-tab to update the molar volume field
+        key =  QtCore.Qt.Key_Tab
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.ShiftModifier)
+        QTest.qWait(100)
+
+        # Assure the molar volume field got updated
+        self.assertEqual(self.widget.ui.editMolarVolume.text(), '1.12595625')
+
+    def testComplexEntryAndReset(self):
+        ''' User entered compound calculations and subsequent reset'''
+
+        self.widget.ui.editMolecularFormula.clear()
+        self.widget.ui.editMolecularFormula.insert("KMnO4")
+        self.widget.ui.editMolarVolume.insert("2.0")
+
+        self.widget.show()
+        # Send tab x3
+        key = QtCore.Qt.Key_Tab
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.NoModifier)
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.NoModifier)
+        QTest.keyEvent(QTest.Press, self.widget, key, QtCore.Qt.NoModifier)
+        QTest.qWait(100)
+
+        # Assure the mass density field is set
+        self.assertEqual(self.widget.ui.editMassDensity.text(), '79.017')
+
+        # Reset the widget
+        self.widget.modelReset()
+
+        self.assertEqual(self.widget.ui.editMolecularFormula.text(), "H2O")
+        self.assertEqual(self.widget.ui.editMolarMass.text(), "18.0153")
+        self.assertEqual(self.widget.ui.editMolarVolume.text(), "")
+        self.assertEqual(self.widget.ui.editMassDensity.text(), "")
+
+        #self.widget.exec_()
+
+    def testHelp(self):
+        """ Assure help file is shown """
+
+        # this should not rise
+        self.widget.displayHelp()
+
+if __name__ == "__main__":
+    unittest.main()
