def test_ctx():
ctx = Context()
assert_is_none(ctx.not_existing)
assert_is_none(ctx['not_existing'])
assert_false('not_existing' in ctx)
ctx.something = 'foo'
assert_equal(ctx.something, 'foo')
assert_equal(ctx.something, ctx['something'])
assert_true('something' in ctx)
ctx['something'] = 'bar'
assert_equal(ctx.something, 'bar')
assert_equal(ctx.something, ctx['something'])
assert_true('something' in ctx)
compare(list(ctx), ctx.__dict__.keys())
