"Test searchengine, coverage 99%."
from idlelib import searchengine as se
import unittest
# from test.support import requires
from tkinter import BooleanVar, StringVar, TclError # ,Tk, Text
from tkinter import messagebox
from idlelib.idle_test.mock_tk import Var, Mbox
from idlelib.idle_test.mock_tk import Text as mockText
import re
# With mock replacements, the module does not use any gui widgets.
# The use of tk.Text is avoided (for now, until mock Text is improved)
# by patching instances with an index function returning what is needed.
# This works because mock Text.get does not use .index.
# The tkinter imports are used to restore searchengine.
def setUpModule():
# Replace s-e module tkinter imports other than non-gui TclError.
se.BooleanVar = Var
se.StringVar = Var
se.messagebox = Mbox
def tearDownModule():
# Restore 'just in case', though other tests should also replace.
se.BooleanVar = BooleanVar
se.StringVar = StringVar
se.messagebox = messagebox
class Mock:
def __init__(self, *args, **kwargs): pass
class GetTest(unittest.TestCase):
# SearchEngine.get returns singleton created & saved on first call.
def test_get(self):
saved_Engine = se.SearchEngine
se.SearchEngine = Mock # monkey-patch class
try:
root = Mock()
engine = se.get(root)
self.assertIsInstance(engine, se.SearchEngine)
self.assertIs(root._searchengine, engine)
self.assertIs(se.get(root), engine)
finally:
se.SearchEngine = saved_Engine # restore class to module
class GetLineColTest(unittest.TestCase):
# Test simple text-independent helper function
def test_get_line_col(self):
self.assertEqual(se.get_line_col('1.0'), (1, 0))
self.assertEqual(se.get_line_col('1.11'), (1, 11))
self.assertRaises(ValueError, se.get_line_col, ('1.0 lineend'))
self.assertRaises(ValueError, se.get_line_col, ('end'))
class GetSelectionTest(unittest.TestCase):
# Test text-dependent helper function.
## # Need gui for text.index('sel.first/sel.last/insert').
## @classmethod
## def setUpClass(cls):
## requires('gui')
## cls.root = Tk()
##
## @classmethod
## def tearDownClass(cls):
## cls.root.destroy()
## del cls.root
def test_get_selection(self):
# text = Text(master=self.root)
text = mockText()
text.insert('1.0', 'Hello World!')
# fix text.index result when called in get_selection
def sel(s):
# select entire text, cursor irrelevant
if s == 'sel.first': return '1.0'
if s == 'sel.last': return '1.12'
raise TclError
text.index = sel # replaces .tag_add('sel', '1.0, '1.12')
self.assertEqual(se.get_selection(text), ('1.0', '1.12'))
def mark(s):
# no selection, cursor after 'Hello'
if s == 'insert': return '1.5'
raise TclError
text.index = mark # replaces .mark_set('insert', '1.5')
self.assertEqual(se.get_selection(text), ('1.5', '1.5'))
class ReverseSearchTest(unittest.TestCase):
# Test helper function that searches backwards within a line.
def test_search_reverse(self):
Equal = self.assertEqual
line = "Here is an 'is' test text."
prog = re.compile('is')
Equal(se.search_reverse(prog, line, len(line)).span(), (12, 14))
Equal(se.search_reverse(prog, line, 14).span(), (12, 14))
Equal(se.search_reverse(prog, line, 13).span(), (5, 7))
Equal(se.search_reverse(prog, line, 7).span(), (5, 7))
Equal(se.search_reverse(prog, line, 6), None)
class SearchEngineTest(unittest.TestCase):
# Test class methods that do not use Text widget.
def setUp(self):
self.engine = se.SearchEngine(root=None)
# Engine.root is only used to create error message boxes.
# The mock replacement ignores the root argument.
def test_is_get(self):
engine = self.engine
Equal = self.assertEqual
Equal(engine.getpat(), '')
engine.setpat('hello')
Equal(engine.getpat(), 'hello')
Equal(engine.isre(), False)
engine.revar.set(1)
Equal(engine.isre(), True)
Equal(engine.iscase(), False)
engine.casevar.set(1)
Equal(engine.iscase(), True)
Equal(engine.isword(), False)
engine.wordvar.set(1)
Equal(engine.isword(), True)
Equal(engine.iswrap(), True)
engine.wrapvar.set(0)
Equal(engine.iswrap(), False)
Equal(engine.isback(), False)
engine.backvar.set(1)
Equal(engine.isback(), True)
def test_setcookedpat(self):
engine = self.engine
engine.setcookedpat(r'\s')
self.assertEqual(engine.getpat(), r'\s')
engine.revar.set(1)
engine.setcookedpat(r'\s')
self.assertEqual(engine.getpat(), r'\\s')
def test_getcookedpat(self):
engine = self.engine
Equal = self.assertEqual
Equal(engine.getcookedpat(), '')
engine.setpat('hello')
Equal(engine.getcookedpat(), 'hello')
engine.wordvar.set(True)
Equal(engine.getcookedpat(), r'\bhello\b')
engine.wordvar.set(False)
engine.setpat(r'\s')
Equal(engine.getcookedpat(), r'\\s')
engine.revar.set(True)
Equal(engine.getcookedpat(), r'\s')
def test_getprog(self):
engine = self.engine
Equal = self.assertEqual
engine.setpat('Hello')
temppat = engine.getprog()
Equal(temppat.pattern, re.compile('Hello', re.IGNORECASE).pattern)
engine.casevar.set(1)
temppat = engine.getprog()
Equal(temppat.pattern, re.compile('Hello').pattern, 0)
engine.setpat('')
Equal(engine.getprog(), None)
Equal(Mbox.showerror.message,
'Error: Empty regular expression')
engine.setpat('+')
engine.revar.set(1)
Equal(engine.getprog(), None)
Equal(Mbox.showerror.message,
'Error: nothing to repeat\nPattern: +\nOffset: 0')
def test_report_error(self):
showerror = Mbox.showerror
Equal = self.assertEqual
pat = '[a-z'
msg = 'unexpected end of regular expression'
Equal(self.engine.report_error(pat, msg), None)
Equal(showerror.title, 'Regular expression error')
expected_message = ("Error: " + msg + "\nPattern: [a-z")
Equal(showerror.message, expected_message)
Equal(self.engine.report_error(pat, msg, 5), None)
Equal(showerror.title, 'Regular expression error')
expected_message += "\nOffset: 5"
Equal(showerror.message, expected_message)
class SearchTest(unittest.TestCase):
# Test that search_text makes right call to right method.
@classmethod
def setUpClass(cls):
## requires('gui')
## cls.root = Tk()
## cls.text = Text(master=cls.root)
cls.text = mockText()
test_text = (
'First line\n'
'Line with target\n'
'Last line\n')
cls.text.insert('1.0', test_text)
cls.pat = re.compile('target')
cls.engine = se.SearchEngine(None)
cls.engine.search_forward = lambda *args: ('f', args)
cls.engine.search_backward = lambda *args: ('b', args)
## @classmethod
## def tearDownClass(cls):
## cls.root.destroy()
## del cls.root
def test_search(self):
Equal = self.assertEqual
engine = self.engine
search = engine.search_text
text = self.text
pat = self.pat
engine.patvar.set(None)
#engine.revar.set(pat)
Equal(search(text), None)
def mark(s):
# no selection, cursor after 'Hello'
if s == 'insert': return '1.5'
raise TclError
text.index = mark
Equal(search(text, pat), ('f', (text, pat, 1, 5, True, False)))
engine.wrapvar.set(False)
Equal(search(text, pat), ('f', (text, pat, 1, 5, False, False)))
engine.wrapvar.set(True)
engine.backvar.set(True)
Equal(search(text, pat), ('b', (text, pat, 1, 5, True, False)))
engine.backvar.set(False)
def sel(s):
if s == 'sel.first': return '2.10'
if s == 'sel.last': return '2.16'
raise TclError
text.index = sel
Equal(search(text, pat), ('f', (text, pat, 2, 16, True, False)))
Equal(search(text, pat, True), ('f', (text, pat, 2, 10, True, True)))
engine.backvar.set(True)
Equal(search(text, pat), ('b', (text, pat, 2, 10, True, False)))
Equal(search(text, pat, True), ('b', (text, pat, 2, 16, True, True)))
class ForwardBackwardTest(unittest.TestCase):
# Test that search_forward method finds the target.
## @classmethod
## def tearDownClass(cls):
## cls.root.destroy()
## del cls.root
@classmethod
def setUpClass(cls):
cls.engine = se.SearchEngine(None)
## requires('gui')
## cls.root = Tk()
## cls.text = Text(master=cls.root)
cls.text = mockText()
# search_backward calls index('end-1c')
cls.text.index = lambda index: '4.0'
test_text = (
'First line\n'
'Line with target\n'
'Last line\n')
cls.text.insert('1.0', test_text)
cls.pat = re.compile('target')
cls.res = (2, (10, 16)) # line, slice indexes of 'target'
cls.failpat = re.compile('xyz') # not in text
cls.emptypat = re.compile(r'\w*') # empty match possible
def make_search(self, func):
def search(pat, line, col, wrap, ok=0):
res = func(self.text, pat, line, col, wrap, ok)
# res is (line, matchobject) or None
return (res[0], res[1].span()) if res else res
return search
def test_search_forward(self):
# search for non-empty match
Equal = self.assertEqual
forward = self.make_search(self.engine.search_forward)
pat = self.pat
Equal(forward(pat, 1, 0, True), self.res)
Equal(forward(pat, 3, 0, True), self.res) # wrap
Equal(forward(pat, 3, 0, False), None) # no wrap
Equal(forward(pat, 2, 10, False), self.res)
Equal(forward(self.failpat, 1, 0, True), None)
Equal(forward(self.emptypat, 2, 9, True, ok=True), (2, (9, 9)))
#Equal(forward(self.emptypat, 2, 9, True), self.res)
# While the initial empty match is correctly ignored, skipping
# the rest of the line and returning (3, (0,4)) seems buggy - tjr.
Equal(forward(self.emptypat, 2, 10, True), self.res)
def test_search_backward(self):
# search for non-empty match
Equal = self.assertEqual
backward = self.make_search(self.engine.search_backward)
pat = self.pat
Equal(backward(pat, 3, 5, True), self.res)
Equal(backward(pat, 2, 0, True), self.res) # wrap
Equal(backward(pat, 2, 0, False), None) # no wrap
Equal(backward(pat, 2, 16, False), self.res)
Equal(backward(self.failpat, 3, 9, True), None)
Equal(backward(self.emptypat, 2, 10, True, ok=True), (2, (9,9)))
# Accepted because 9 < 10, not because ok=True.
# It is not clear that ok=True is useful going back - tjr
Equal(backward(self.emptypat, 2, 9, True), (2, (5, 9)))
if __name__ == '__main__':
unittest.main(verbosity=2)
Codebase Browser
cpython