def testRapidChanges(self):
"""
Description
This test verifies that the subscriber library doesn't emit
unnecessary valueChanged signals (in spite of receiving multiple
D-Bus messages in the same main loop iteration).
Steps
1. starts up a provider with one property
2. starts a client, verifies that the value arrives
3. suspends the client (so it stops processing D-Bus messages)
4. sets new value for the property twice in the provider
5. resumes the client
6. verifies that the client receives only one valueChanged signal
"""
provider_fast = CLTool("context-provide", "--v2", "com.nokia.fast",
"int","test.fast","44")
provider_fast.expect("Setting key")
context_client = CLTool("context-listen", "test.fast")
self.assert_(context_client.expect(wanted("test.fast", "int", "44")),
"Bad value for the fast property, wanted 44")
context_client.suspend()
provider_fast.send("test.fast = 34")
provider_fast.expect("Setting key")
provider_fast.send("test.fast = 54")
provider_fast.expect("Setting key")
context_client.resume()
context_client.expect(wanted("test.fast", "int", "54"))
# the two value changes can happen very close in time, so we
# have to check that beyond the good value there are no other
# value(s)
if len(re.findall("test.fast =", context_client.last_output)) != 1:
context_client.printio()
self.assert_(False,
"expected a single valueChanged")
# not even after waiting one second
self.assertFalse(context_client.expect("test.fast =", wantdump = False, timeout=1),
"expected a single valueChanged")
context_client.wait()
provider_fast.wait()
def testAsynchronicity(self):
"""
Description
This test verifies that the asynchronicity of the subscriber
library
Pre-conditions
2 Providers started with context-provide tool.
Each provider offers one property.
1 provider is delayed (3s).
Steps
Subscribe to both properties
Verify that return values are correct
Measure the time elapsed between the reception of the 2 values.
Post-conditions
Kill providers
References
None
"""
# start the client
provider_slow = CLTool("context-provide", "--v2", "com.nokia.slow",
"int","test.slow","42")
provider_slow.expect("Setting key") # wait for it
provider_fast = CLTool("context-provide", "--v2", "com.nokia.fast",
"int","test.fast","44")
provider_fast.expect("Setting key") # wait for it
context_client = CLTool("context-listen")
context_client.expect("Available commands") # wait for it
provider_slow.comment("provider_slow sleep time started at" + str(time.time()))
provider_slow.send("sleep 3")
provider_slow.expect("Sleeping") # wait for it
context_client.send("n test.slow ; n test.fast")
# check the fast property
self.assert_(context_client.expect(wanted("test.fast", "int", "44")), # timeout == 3 seconds
"Bad value for the fast property, wanted 44")
fast_time = time.time()
context_client.comment("Fast property arrived with good value at: " + str(fast_time))
# check the slow property
self.assert_(context_client.expect(wanted("test.slow", "int", "42")), # timeout == 10 seconds max, but 5 is enough usually
"Bad value for the slow property, wanted 42")
slow_time = time.time()
context_client.comment("Slow property arrived with good value at: " + str(slow_time))
if slow_time - fast_time < 1.5:
provider_slow.printio()
context_client.printio()
self.assert_(False,
"The arrival time of the fast and slow property is not far enough from each other")
# context_client.printio()
context_client.wait()
provider_fast.wait()
provider_slow.wait()
