Added test coverage of navigation buttons and class

tests/test_gui.py

@@ -1163,6 +1163,22 @@ def testDocAction(qtbot, nwLipsum, nwTemp):
         "nunc lacus, imperdiet nec posuere ac, interdum non lectus."
     )
 
+    # Navigation History
+    assert nwGUI.viewDocument("04468803b92e1")
+    assert nwGUI.docViewer.theHandle == "04468803b92e1"
+    assert nwGUI.docViewer.docHeader.backButton.isEnabled()
+    assert not nwGUI.docViewer.docHeader.forwardButton.isEnabled()
+
+    qtbot.mouseClick(nwGUI.docViewer.docHeader.backButton, Qt.LeftButton)
+    assert nwGUI.docViewer.theHandle == "4c4f28287af27"
+    assert not nwGUI.docViewer.docHeader.backButton.isEnabled()
+    assert nwGUI.docViewer.docHeader.forwardButton.isEnabled()
+
+    qtbot.mouseClick(nwGUI.docViewer.docHeader.forwardButton, Qt.LeftButton)
+    assert nwGUI.docViewer.theHandle == "04468803b92e1"
+    assert nwGUI.docViewer.docHeader.backButton.isEnabled()
+    assert not nwGUI.docViewer.docHeader.forwardButton.isEnabled()
+
     # qtbot.stopForInteraction()
     nwGUI.closeMain()