#!/usr/bin/env python

import difflib

def run_test(expected_tag, oldtext, newtext):
    a = oldtext.splitlines()
    b = newtext.splitlines()

    opcodes = difflib.SequenceMatcher(None, a, b).get_opcodes()

    print "Running '%s' test case..." % expected_tag
    if len(opcodes) == 2 and \
       opcodes[0][0] == "replace" and \
       opcodes[1][0] == expected_tag:
        print "\tPassed." % expected_tag
    else:
        print "\tFailed. Should have seen:"
        print "\t\treplace"
        print "\t\t%s" % expected_tag
        print
        print "\tInstead, saw:"
        for tag, i1, i2, j1, j2 in opcodes:
            print "\t\t%s" % tag

    print


run_test("insert",
    "This is my old file, containing only one line.",
    "This is my new file.\
It contains multiple lines.\
SequenceMatcher should see two blocks as a result.")

run_test("delete",
    "This is my old file.\
It contains multiple lines.\
SequenceMatcher should see two blocks as a result.",
    "This is my new file, containing only one line.")