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POUnittest Tkinter File Dialog
 

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    <h1>Question</h1> <p>Is there any way to automate a <code>tkFileDialog</code> selection to run it through <code>unittest</code>? The following is the only use of <code>tkinter</code> in my application:</p> <pre><code>root = Tkinter.Tk() types = [('Comma Separated Values', '.csv'), ('All Files', '*')] filename = tkFileDialog.askopenfilename(parent=root, filetypes=types) root.destroy() </code></pre> <p><strong>Edit</strong>: I didn't mention that this part of the code was trapped in a method call from a class outside my control. <hr></p> <h1>Background</h1> <p>I've built a local app that creates an http server on <code>localhost</code> and runs its GUI with HTML/CSS/JS in a web browser. Because of browser restrictions, I can't use the built-in file dialog and so have to send this request through Python. I want this to run on a OSX with the built-in Python 2.5. I'm not very familiar with <code>Tcl/Tk</code>.</p> <h2>Attempt #1</h2> <p>If I could get to the underlying widgets, I could generate the clicks like in <a href="https://stackoverflow.com/questions/6167019/generate-a-click-event-in-tkinter">this question</a>. However, looking at the <a href="http://hg.python.org/cpython/file/5accb0ac8bfb/Lib/lib-tk/tkCommonDialog.py" rel="nofollow noreferrer">dialog source</a>, it appears to me that the <code>Tcl</code> call in lines 48-50 is blocking. Is this a correct assumption?</p> <h2>Attempt #2</h2> <p>I thought there might be a way using <code>Tcl</code> commands directly through <code>root.tk.call</code>. Since I'm on <code>Python2</code>, I think the underlying <code>Tcl</code> is a single call to <code>tk_getOpenFile</code>. Would I have to ensure the <code>Tcl</code> interpreter is threaded? Is there any <code>Tcl/Tk</code> command that can help me out here?</p> <h2>Attempt #3</h2> <p>I could implement the file selection from scratch using <code>os.listdir</code> etc. (Probably in a separate HTML page communicating back and forth with the server). It would be more than a little painful and hopefully avoidable.</p> <p><hr></p> <h1>Solution</h1> <p>Based on A. Rodas's answer below, I came up with the following:</p> <pre><code>import tkFileDialog old_dialog = tkFileDialog.askopenfilename try: tkFileDialog.askopenfilename = lambda *args, **kw: filename # First test dialog cancelled filename = '' method_that_calls_tk() # run some assertions # Next test a valid file name with valid contents filename = self.VALID_FILENAME method_that_calls_tk() # run some assertions # Now test a valid file name with invalid contents filename = self.INVALID_CONTENTS_FILENAME method_that_calls_tk() # run some assertions # Now test an invalid file name filename = self.INVALID_FILENAME method_that_calls_tk() # run some assertions finally: tkFileDialog.askopenfilename = old_dialog </code></pre>
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    1. COWhat platform is this on? It's somewhat possible to inject events on X11, but with other platforms (i.e., where the true native dialog is used) it's exceptionally difficult. An easier approach would be to completely mock out `tkFileDialog`…
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    2. COThis would be on X11. I wound up mocking the `askopenfile` function. Out of curiosity, do you have a link or resource where I could read up on injecting events on X11?
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