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# Conditional assertions
Flexmock supports conditional assertions based on external state. Consider
the rather contrived `Radio` class with the following methods:
```python
class Radio:
is_on = False
def __init__(self):
self.volume = 0
def switch_on(self):
self.is_on = True
def switch_off(self):
self.is_on = False
def select_channel(self):
return None
def adjust_volume(self, num):
self.volume = num
radio = Radio()
```
Now we can define some method call expectations dependent on the state of the
radio:
```python
flexmock(radio)
radio.should_receive("select_channel").when(lambda: radio.is_on).once()
radio.should_call("adjust_volume").with_args(5).when(lambda: radio.is_on).once()
```
Calling these while the radio is off will result in an error:
```python
radio.select_channel()
# Traceback (most recent call last):
# flexmock.StateError: select_channel expected to be called
# when condition is True
```
```python
radio.adjust_volume(5)
# Traceback (most recent call last):
# flexmock.StateError: adjust_volume expected to be called
# when condition is True
```
Turning the radio on will make things work as expected:
```python
radio.is_on = True
radio.select_channel()
radio.adjust_volume(5)
```
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