def test_external_access():
rc = Context()
rc.new_value(a=1)
rc.new_expression('b', lambda env: env.a + 1)
rc.new_observer('c', lambda env: env.b + 1)
b = rc['b'].get_value()
assert b is 2
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 0
rc.run()
assert rc['c'].value is 3
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 1
rc = Context()
rc.new_value(a=1)
rc.new_expression('b', lambda env: env.a + 1)
rc.new_observer('c', lambda env: env.b + 1)
b = rc['b'].get_value()
assert b is 2
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 0
rc.set_value(a=2)
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 0
raises(Exception, rc.get_value, 'c')
def test_isolation_works():
rc = Context()
rc.new_value(x=1, y=10)
rc.new_expression('b', lambda env: env.y + 100)
rc.new_observer('c', lambda env: env.x + env[:].y + env[:].b)
rc.new_observer('d', lambda env: env.x + env[:].y + env.b)
rc.run()
assert rc['c'].value is 121
assert rc['c'].exec_count is 1
assert rc['d'].value is 121
assert rc['d'].exec_count is 1
rc.set_value(x=2)
assert rc['c'].value is 122
assert rc['c'].exec_count is 2
assert rc['d'].value is 122
assert rc['d'].exec_count is 2
rc.set_value(y=20)
assert rc['c'].value is 122
assert rc['c'].exec_count is 2
assert rc['d'].value is 142
assert rc['d'].exec_count is 3
rc.set_value(x=3)
assert rc['c'].value is 143
assert rc['c'].exec_count is 3
assert rc['d'].value is 143
assert rc['d'].exec_count is 4
def test_order_of_evaluation():
rc = Context()
rc.new_value(a=1)
rc.new_expression('b', lambda env: env.a + 5)
rc.new_observer('c', lambda env: env.a * env.b)
rc.run()
assert rc['c'].value is 6
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 1
rc.set_value(a=2)
assert rc['c'].value is 14
assert rc['b'].exec_count is 2
assert rc['c'].exec_count is 2
rc = Context()
rc.new_value(a=1)
rc.new_expression('b', lambda env: env.a + 5)
rc.new_observer('c', lambda env: env.b * env.a)
rc.run()
assert rc['c'].value is 6
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 1
rc.set_value(a=2)
assert rc['c'].value is 14
assert rc['b'].exec_count is 2
assert rc['c'].exec_count is 2
def test_memoize_and_safe_mode():
def b1(env):
if len(env.a) > 0:
env.a.pop()
return env.a
rc = Context(safe=True)
rc.new_value(a=[1, 2, 3])
rc.new_expression(b=b1)
rc.memoize('b')
rc.new_observer('c', lambda env: env.b)
raises(Exception, rc.memoize, 'a')
raises(Exception, rc.memoize, 'c')
rc.memoize(rc['b'], False)
assert not rc['b'].memoized
rc.memoize('b', True)
assert rc['b'].memoized
rc.run()
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 4
assert len(rc['b'].value) is 0
assert len(rc['c'].value) is 0
rc.set_value(a=[1, 2, 3])
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 5
assert len(rc['b'].value) is 0
assert len(rc['c'].value) is 0
rc.set_value(a=[1, 2])
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 6
assert len(rc['b'].value) is 0
assert len(rc['c'].value) is 0
rc.safe = False
rc.set_value(a=[1, 2, 3])
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 7
assert len(rc['b'].value) is 0
assert len(rc['c'].value) is 0
rc.set_value(a=[1])
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 8
assert len(rc['b'].value) is 0
assert len(rc['c'].value) is 0
rc.set_value(a=[10, 20])
assert rc['b'].exec_count is 5
assert rc['c'].exec_count is 9
assert len(rc['b'].value) is 1
assert len(rc['c'].value) is 1
def test_observer_suspending():
rc = Context()
rc.new_value(v=1)
rc.new_expression('a', lambda env: env.v)
rc.new_observer('b', lambda env: env.a)
raises(Exception, rc.suspend, 'v')
raises(Exception, rc.suspend, 'a')
raises(Exception, rc.resume, 'v')
raises(Exception, rc.resume, 'a')
rc.suspend('b')
rc.run()
assert rc['a'].exec_count is 1
assert rc['b'].exec_count is 1
rc.resume('b')
rc.run()
assert rc['a'].exec_count is 1
assert rc['b'].exec_count is 1
rc.suspend('b')
assert not rc['b'].invalidated
rc.set_value(v=2)
assert rc['b'].invalidated
assert rc['a'].exec_count is 1
assert rc['b'].exec_count is 1
rc['b'].resume()
rc.set_value(v=2.5)
rc['b'].suspend()
rc.run()
assert rc['a'].exec_count is 2
assert rc['b'].exec_count is 2
rc.set_value(v=3)
assert rc['a'].exec_count is 2
assert rc['b'].exec_count is 2
assert rc['b'].invalidated
rc.set_value(v=4)
rc['b'].resume()
rc.run()
assert rc['a'].exec_count is 3
assert rc['b'].exec_count is 3
assert not rc['b'].invalidated
rc.suspend('b')
rc.set_value(v=5)
rc.resume('b', run=True)
assert rc['a'].exec_count is 4
assert rc['b'].exec_count is 4
def test_overreactivity_1():
rc = Context()
rc.new_value(v=1)
rc.new_expression('a', lambda env: env.v)
rc.new_expression('b', lambda env: env.a + env.v)
rc.new_observer('c', lambda env: env.b)
rc.run()
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 1
rc.set_value(v=11)
assert rc['b'].exec_count is 2
assert rc['c'].exec_count is 2
def test_write_then_read():
def b(env):
env.a = env[:].a - 1
return env.a
rc = Context()
rc.new_value(a=3)
rc.new_expression(b=b)
rc.new_observer('c', lambda env: env.b)
rc.run()
assert rc['c'].exec_count is 1
rc.set_value(a=10)
assert rc['c'].exec_count is 2
def test_undefined_key():
try:
raise UndefinedKey('a')
except UndefinedKey as e:
assert e.name == 'a'
rc = Context()
rc.new_expression('b', lambda env: env.a + 1)
rc.new_observer('c', lambda env: env.b + 1)
raises(Exception, lambda: rc['a'])
rc.run()
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 1
rc.new_value(a=1)
assert rc['b'].exec_count is 2
assert rc['c'].exec_count is 2
assert rc['c'].value is 3
def test_overreactivity_2():
rc = Context()
rc.new_value(a=1)
rc.new_expression('b', lambda env: env.a + 5)
rc.new_observer('c', lambda env: env.b * env.a)
rc.new_observer('d', lambda env: env.b * env.a)
rc.run()
assert rc['c'].value is 6
assert rc['d'].value is 6
assert rc['b'].exec_count is 1
assert rc['c'].exec_count is 1
assert rc['d'].exec_count is 1
rc.set_value(a=2)
assert rc['c'].value is 14
assert rc['d'].value is 14
assert rc['b'].exec_count is 2
assert rc['c'].exec_count is 2
assert rc['d'].exec_count is 2
class TestRecursion(object):
def setup(self):
self.rc = Context()
self.rc.new_value(a=3)
self.rc.new_observer('c', lambda env: env.b)
def fn_circular(self, env):
if env.a is 0:
return 0
env.a -= 1
return env.a
def fn_recursive(self, env):
if env.a is 0:
return 0
env.a -= 1
return env.b
def fn_nonreactive(self, env):
if self.a is 0:
return 0
self.a -= 1
return env.b
def test_circular_references(self):
self.rc.new_expression(b=self.fn_circular)
self.rc.run()
assert self.rc['c'].exec_count is 4
self.rc.set_value(a=3)
assert self.rc['c'].exec_count is 8
def test_simple_recursion(self):
self.rc.new_expression(b=self.fn_recursive)
self.rc.run()
assert self.rc['c'].exec_count is 2
assert self.rc['b'].exec_count is 4
def test_nonreactive_recursion(self):
self.a = 3
self.rc.new_expression(b=self.fn_nonreactive)
self.rc.run()
assert self.rc['b'].exec_count is 4
assert self.rc['c'].value is 0
def test_circular_observer_only(self):
self.rc.new_value(b=0)
self.rc.new_observer(d=self.fn_circular)
self.rc.run()
assert self.rc['d'].exec_count is 4
def test_safe_mode():
def b1(env):
if len(env.a) > 0:
env.a.pop()
return env.a
rc = Context(safe=True)
rc.new_value(a=[1, 2, 3])
rc.new_expression(b=b1)
rc.new_observer('c', lambda env: env.b)
rc.run()
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 4
assert len(rc['b'].value) is 0
assert len(rc['c'].value) is 0
rc.safe = False
rc.set_value(a=[1, 2, 3])
assert rc['b'].exec_count is 5
assert rc['c'].exec_count is 5
assert len(rc['b'].value) is 2
assert len(rc['c'].value) is 2
def b2(env):
env.b1.pop()
return env.a
rc = Context(safe=True)
rc.new_value(a=[1, 2, 3])
rc.new_expression(b1=lambda env: list(env.a))
rc.new_expression(b2=b2)
rc.new_observer('c', lambda env: (env.b1, env.b2))
raises(Exception, rc.run)
rc = Context(safe=False)
rc.new_value(a=[1, 2, 3])
rc.new_expression(b1=lambda env: list(env.a))
rc.new_expression(b2=b2)
rc.new_observer('c', lambda env: (env.b1, env.b2))
rc.run()
assert rc['b1'].exec_count is 1
assert rc['b2'].exec_count is 1
assert rc['c'].exec_count is 1
def b3(env):
if len(env.a1) > 0:
return env.a1.pop()
return 0
rc = Context(safe=True)
a = [1, 2, 3]
rc.new_value(a1=a, a2=a)
rc.new_expression(b=b3)
rc.new_observer('c', lambda env: env.b)
rc.run()
assert rc['b'].exec_count is 4
assert rc['c'].exec_count is 4
assert rc['b'].value is 0
assert rc['c'].value is 0
assert len(rc['a1'].value) is 0
assert len(rc['a2'].value) is 0
assert len(a) is 0
a.extend([1, 2])
rc.run()
assert rc['b'].exec_count is 7
assert rc['c'].exec_count is 7
assert rc['b'].value is 0
assert rc['c'].value is 0
assert len(rc['a1'].value) is 0
assert len(rc['a2'].value) is 0
assert len(a) is 0
