Mercurial > hg
annotate tests/test-ctxmanager.py @ 32420:0906b85bf222
demandimport: move to separate package
In Python 3, demand loading is per-package. Keeping demandimport in the
mercurial package would disable demand loading for any modules in
mercurial.
author | Siddharth Agarwal <sid0@fb.com> |
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date | Sun, 21 May 2017 12:10:53 -0700 |
parents | 68c43a416585 |
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1 from __future__ import absolute_import |
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2 |
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3 import silenttestrunner |
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4 import unittest |
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5 |
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6 from mercurial import util |
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7 |
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8 class contextmanager(object): |
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9 def __init__(self, name, trace): |
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10 self.name = name |
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11 self.entered = False |
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12 self.exited = False |
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13 self.trace = trace |
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14 |
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15 def __enter__(self): |
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16 self.entered = True |
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17 self.trace(('enter', self.name)) |
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18 return self |
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19 |
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20 def __exit__(self, exc_type, exc_val, exc_tb): |
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21 self.exited = exc_type, exc_val, exc_tb |
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22 self.trace(('exit', self.name)) |
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23 |
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24 def __repr__(self): |
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25 return '<ctx %r>' % self.name |
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26 |
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27 class ctxerror(Exception): |
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28 pass |
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29 |
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30 class raise_on_enter(contextmanager): |
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31 def __enter__(self): |
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32 self.trace(('raise', self.name)) |
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33 raise ctxerror(self.name) |
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34 |
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35 class raise_on_exit(contextmanager): |
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36 def __exit__(self, exc_type, exc_val, exc_tb): |
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37 self.trace(('raise', self.name)) |
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38 raise ctxerror(self.name) |
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39 |
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40 def ctxmgr(name, trace): |
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41 return lambda: contextmanager(name, trace) |
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42 |
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43 class test_ctxmanager(unittest.TestCase): |
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44 def test_basics(self): |
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45 trace = [] |
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46 addtrace = trace.append |
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47 with util.ctxmanager(ctxmgr('a', addtrace), ctxmgr('b', addtrace)) as c: |
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48 a, b = c.enter() |
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49 c.atexit(addtrace, ('atexit', 'x')) |
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50 c.atexit(addtrace, ('atexit', 'y')) |
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51 self.assertEqual(trace, [('enter', 'a'), ('enter', 'b'), |
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52 ('atexit', 'y'), ('atexit', 'x'), |
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53 ('exit', 'b'), ('exit', 'a')]) |
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54 |
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55 def test_raise_on_enter(self): |
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56 trace = [] |
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57 addtrace = trace.append |
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58 with self.assertRaises(ctxerror): |
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59 with util.ctxmanager(ctxmgr('a', addtrace), |
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60 lambda: raise_on_enter('b', addtrace)) as c: |
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61 c.enter() |
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62 addtrace('unreachable') |
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63 self.assertEqual(trace, [('enter', 'a'), ('raise', 'b'), ('exit', 'a')]) |
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64 |
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65 def test_raise_on_exit(self): |
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66 trace = [] |
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67 addtrace = trace.append |
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68 with self.assertRaises(ctxerror): |
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69 with util.ctxmanager(ctxmgr('a', addtrace), |
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70 lambda: raise_on_exit('b', addtrace)) as c: |
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71 c.enter() |
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72 addtrace('running') |
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73 self.assertEqual(trace, [('enter', 'a'), ('enter', 'b'), 'running', |
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74 ('raise', 'b'), ('exit', 'a')]) |
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75 |
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76 if __name__ == '__main__': |
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77 silenttestrunner.main(__name__) |