def setUp(self):
# Get an ast we can visit with our visitors
self.ast_to_visit = get_test_ast()
# How should the visited ast look like (further modified by tests)?
self.ast_should = get_test_ast()
self.text_change_visitor = TextChangeVisitor()
self.politeness_visitor = PolitenessVisitor()
self.enlarge_visitor = EnlargeVisitor()
self.gui_visitor = GuiVisitor()
class VisitorTest(unittest.TestCase):
original_ast = get_test_ast()
def setUp(self):
# Get an ast we can visit with our visitors
self.ast_to_visit = get_test_ast()
# How should the visited ast look like (further modified by tests)?
self.ast_should = get_test_ast()
self.text_change_visitor = TextChangeVisitor()
self.politeness_visitor = PolitenessVisitor()
self.enlarge_visitor = EnlargeVisitor()
self.gui_visitor = GuiVisitor()
def test_text_change_visitor(self):
"""Check if the TextChangeVisitor works."""
self.change_text_ast_should()
self.text_change_visitor.visit(self.ast_to_visit)
self.check_result()
def test_gui_visitor(self):
"""Check if the GuiVisitor works."""
mainwindow = self.gui_visitor.visit(self.ast_to_visit)
self.assertTrue(isinstance(mainwindow, Tk))
# Check that the original ast remain unchanged
self.check_result()
def test_politeness_visitor(self):
"""
Check if the PolitenessVisitor works.
This test fails until you have implemented the visitor properly.
"""
self.polite_ast_should()
self.politeness_visitor.visit(self.ast_to_visit)
self.check_result()
def test_enlarge_visitor(self):
"""
Check if the EnlargeVisitor works.
This test fails until you have implemented the visitor properly.
"""
self.enlarge_ast_should()
self.enlarge_visitor.visit(self.ast_to_visit)
self.check_result()
def test_coordinator(self):
"""
Check if combining several visitors works.
This test fails until you have implemented all visitors properly.
"""
self.change_text_ast_should()
self.polite_ast_should()
self.enlarge_ast_should()
visitors = (TextChangeVisitor, PolitenessVisitor, EnlargeVisitor, GuiVisitor)
mainwindow = execute_visitors(self.ast_to_visit, visitors)
self.assertTrue(isinstance(mainwindow, Tk))
self.check_result()
def check_result(self):
"""Checks whether the visited ast looks how it should."""
self.assertEqual(self.ast_to_visit, self.ast_should)
######################### Helpers to modify 'ast_should' ######################
def enlarge_ast_should(self):
"""Enlarges 'ast_should' the way that EnlargeVisitor should do it too."""
def enlarge(w):
w.width = w.width + 100
w.height = w.height + 100
enlarge(self.ast_should)
enlarge(self.ast_should.children[0])
def change_text_ast_should(self):
"""
Changes texts of 'ast_should' the way that TextChangeVisitor
should do it too.
"""
def add_prefix(w, prefix):
w.text = prefix + w.text
add_prefix(self.ast_should.children[0].children[0], "LABEL: ")
add_prefix(self.ast_should.children[0].children[1], "BUTTON: ")
add_prefix(self.ast_should.children[1], "LABEL: ")
def polite_ast_should(self):
"""Polites 'ast_should' the way that PolitenessVisitor should do it too."""
def get_polite(w):
w.text = w.text.replace("shit", "peeep")
get_polite(self.ast_should.children[0].children[1])
get_polite(self.ast_should.children[1])
