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Issue #18365: Add mock Text class and test thereof versus tk.Text.

Browse source 
Based on patches by Todd.Rovito and Phil Webster.
This commit is contained in:
Terry Jan Reedy 2013-07-12 20:10:23 -04:00
parent ce10fab9f6
commit 21784da416
2 changed files with 449 additions and 5 deletions
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226
Lib/idlelib/idle_test/mock_tk.py
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@ -1,4 +1,5 @@
"""Classes that replace tkinter gui objects used by an object being tested.
A gui object is anything with a master or parent paramenter, which is typically
required in spite of what the doc strings say.
"""
@ -15,8 +16,10 @@ class Var:
return self.value
class Mbox_func:
"""Generic mock for messagebox functions. All have same call signature.
Mbox instantiates once for each function. Tester uses attributes.
"""Generic mock for messagebox functions, which all have the same signature.
Instead of displaying a message box, the mock's call method saves the
arguments as instance attributes, which test functions can then examime.
"""
def __init__(self):
self.result = None # The return for all show funcs
@ -30,6 +33,7 @@ class Mbox_func:
class Mbox:
"""Mock for tkinter.messagebox with an Mbox_func for each function.
This module was 'tkMessageBox' in 2.x; hence the 'import as' in 3.x.
Example usage in test_module.py for testing functios in module.py:
---
@ -49,9 +53,9 @@ class Test(unittest.TestCase):
def tearDownClass(cls):
module.tkMessageBox = orig_mbox
---
When tkMessageBox functions are the only gui making calls in a method,
this replacement makes the method gui-free and unit-testable.
For 'ask' functions, set func.result return before calling method.
For 'ask' functions, set func.result return value before calling the method
that uses the message function. When tkMessageBox functions are the
only gui alls in a method, this replacement makes the method gui-free,
"""
askokcancel = Mbox_func() # True or False
askquestion = Mbox_func() # 'yes' or 'no'
@ -61,3 +65,215 @@ class Test(unittest.TestCase):
showerror = Mbox_func() # None
showinfo = Mbox_func() # None
showwarning = Mbox_func() # None
from _tkinter import TclError
class Text:
"""A semi-functional non-gui replacement for tkinter.Text text editors.
The mock's data model is that a text is a list of \n-terminated lines.
The mock adds an empty string at the beginning of the list so that the
index of actual lines start at 1, as with Tk. The methods never see this.
Tk initializes files with a terminal \n that cannot be deleted. It is
invisible in the sense that one cannot move the cursor beyond it.
This class is only tested (and valid) with strings of ascii chars.
For testing, we are not concerned with Tk Text's treatment of,
for instance, 0-width characters or character + accent.
"""
def __init__(self, master=None, cnf={}, **kw):
'''Initialize mock, non-gui, text-only Text widget.
At present, all args are ignored. Almost all affect visual behavior.
There are just a few Text-only options that affect text behavior.
'''
self.data = ['', '\n']
def index(self, index):
"Return string version of index decoded according to current text."
return "%s.%s" % self._decode(index, endflag=1)
def _decode(self, index, endflag=0):
"""Return a (line, char) tuple of int indexes into self.data.
This implements .index without converting the result back to a string.
The result is contrained by the number of lines and linelengths of
self.data. For many indexes, the result is initally (1, 0).
The input index may have any of several possible forms:
* line.char float: converted to 'line.char' string;
* 'line.char' string, where line and char are decimal integers;
* 'line.char lineend', where lineend='lineend' (and char is ignored);
* 'line.end', where end='end' (same as above);
* 'insert', the positions before terminal \n;
* 'end', whose meaning depends on the endflag passed to ._endex.
* 'sel.first' or 'sel.last', where sel is a tag -- not implemented.
"""
if isinstance(index, (float, bytes)):
index = str(index)
try:
index=index.lower()
except AttributeError:
raise TclError('bad text index "%s"' % index) from None
lastline = len(self.data) - 1 # same as number of text lines
if index == 'insert':
return lastline, len(self.data[lastline]) - 1
elif index == 'end':
return self._endex(endflag)
line, char = index.split('.')
line = int(line)
# Out of bounds line becomes first or last ('end') index
if line < 1:
return 1, 0
elif line > lastline:
return self._endex(endflag)
linelength = len(self.data[line]) -1 # position before/at \n
if char.endswith(' lineend') or char == 'end':
return line, linelength
# Tk requires that ignored chars before ' lineend' be valid int
# Out of bounds char becomes first or last index of line
char = int(char)
if char < 0:
char = 0
elif char > linelength:
char = linelength
return line, char
def _endex(self, endflag):
'''Return position for 'end' or line overflow corresponding to endflag.
-1: position before terminal \n; for .insert(), .delete
0: position after terminal \n; for .get, .delete index 1
1: same viewed as begininning of non-existent next line (for .index)
'''
n = len(self.data)
if endflag == 1:
return n, 0
else:
n -= 1
return n, len(self.data[n]) + endflag
def insert(self, index, chars):
"Insert chars before the character at index."
if not chars: # ''.splitlines() is [], not ['']
return
chars = chars.splitlines(True)
if chars[-1][-1] == '\n':
chars.append('')
line, char = self._decode(index, -1)
before = self.data[line][:char]
after = self.data[line][char:]
self.data[line] = before + chars[0]
self.data[line+1:line+1] = chars[1:]
self.data[line+len(chars)-1] += after
def get(self, index1, index2=None):
"Return slice from index1 to index2 (default is 'index1+1')."
startline, startchar = self._decode(index1)
if index2 is None:
endline, endchar = startline, startchar+1
else:
endline, endchar = self._decode(index2)
if startline == endline:
return self.data[startline][startchar:endchar]
else:
lines = [self.data[startline][startchar:]]
for i in range(startline+1, endline):
lines.append(self.data[i])
lines.append(self.data[endline][:endchar])
return ''.join(lines)
def delete(self, index1, index2=None):
'''Delete slice from index1 to index2 (default is 'index1+1').
Adjust default index2 ('index+1) for line ends.
Do not delete the terminal \n at the very end of self.data ([-1][-1]).
'''
startline, startchar = self._decode(index1, -1)
if index2 is None:
if startchar < len(self.data[startline])-1:
# not deleting \n
endline, endchar = startline, startchar+1
elif startline < len(self.data) - 1:
# deleting non-terminal \n, convert 'index1+1 to start of next line
endline, endchar = startline+1, 0
else:
# do not delete terminal \n if index1 == 'insert'
return
else:
endline, endchar = self._decode(index2, -1)
# restricting end position to insert position excludes terminal \n
if startline == endline and startchar < endchar:
self.data[startline] = self.data[startline][:startchar] + \
self.data[startline][endchar:]
elif startline < endline:
self.data[startline] = self.data[startline][:startchar] + \
self.data[endline][endchar:]
startline += 1
for i in range(startline, endline+1):
del self.data[startline]
def compare(self, index1, op, index2):
line1, char1 = self._decode(index1)
line2, char2 = self._decode(index2)
if op == '<':
return line1 < line2 or line1 == line2 and char1 < char2
elif op == '<=':
return line1 < line2 or line1 == line2 and char1 <= char2
elif op == '>':
return line1 > line2 or line1 == line2 and char1 > char2
elif op == '>=':
return line1 > line2 or line1 == line2 and char1 >= char2
elif op == '==':
return line1 == line2 and char1 == char2
elif op == '!=':
return line1 != line2 or char1 != char2
else:
raise TclError('''bad comparison operator "%s":'''
'''must be <, <=, ==, >=, >, or !=''' % op)
# The following Text methods normally do something and return None.
# Whether doing nothing is sufficient for a test will depend on the test.
def mark_set(self, name, index):
"Set mark *name* before the character at index."
pass
def mark_unset(self, *markNames):
"Delete all marks in markNames."
def tag_remove(self, tagName, index1, index2=None):
"Remove tag tagName from all characters between index1 and index2."
pass
# The following Text methods affect the graphics screen and return None.
# Doing nothing should always be sufficient for tests.
def scan_dragto(self, x, y):
"Adjust the view of the text according to scan_mark"
def scan_mark(self, x, y):
"Remember the current X, Y coordinates."
def see(self, index):
"Scroll screen to make the character at INDEX is visible."
pass
# The following is a Misc method inheritet by Text.
# It should properly go in a Misc mock, but is included here for now.
def bind(sequence=None, func=None, add=None):
"Bind to this widget at event sequence a call to function func."
pass