Dialogue class for testing REPLs
Project description
The Dialogue class
The Dialogue
class helps testing REPLs (interactive interpreters with a Read-Eval-Print-Loop).
Given a multi-line interactive session transcript, a Dialogue
instance emulates user interactions by offering a fake_input
method which can replace the input
built-in function in Python 3.
How to use
You can code your REPL function to accept an input function as an optional argument, or you can monkey patch Python's input
built-in. Either way, you replace the standard input
with the fake_input
method bound to a Dialogue
instance. Each time it is invoked, this method will print the next prompt and fake user input from the session transcript, then return the same user input string to the REPL for processing.
The Dialogue.session
instance attribute holds a multi-line string with all the prompts, user inputs and the outputs expected from the REPL under test. This is used to assert
the test case.
See the dialogue_test.py
module for two simple REPLs that exercise the Dialogue
class.
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