def testRestart(self):
"""Checks that an Component will run after being stopped without a new attach """
self.setupComponent()
# Get ports
compDataFloatOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
compDataSddsIn = self.comp.getPort('dataSddsIn')
# Create data
fakeData = [x for x in range(0, 512)]
# Create packet and send
h = Sdds.SddsHeader(0, DM = [0, 1, 0], TTV = 1, TT = 0)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data,stream = self.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 512)
# Validate data is correct
self.assertEqual(fakeData, list(struct.unpack('>512H', struct.pack('>512H', *data))))
self.comp.stop()
time.sleep(1)
# Get data
data,stream = self.getData()
self.assertTrue(stream.eos)
#Restart Component and send more data
self.comp.start()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data,stream = self.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 512)
# Validate data is correct
self.assertEqual(fakeData, list(struct.unpack('>512H', struct.pack('>512H', *data))))
def testNewYear(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
pktNum = 0
sr=1e6
xdelta_ns=int(1/sr * 1e9)
ns_in_year = 1e9*31536000
time_ns=ns_in_year - xdelta_ns*512*20
# No time slips here
while pktNum < 100:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4))
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns
if time_ns > ns_in_year:
time_ns = time_ns - ns_in_year
self.assertEqual(self.comp.status.time_slips, 0, "There should be no time slips!")
def testShortLittleEndianness(self):
self.setupComponent(endianness=LITTLE_ENDIAN)
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
# Byte Swap it here to make it little endian on send since encode does big endian (swap)
fakeData_bs = list(struct.unpack('>512H', struct.pack('@512H', *fakeData)))
# Convert fakeData to BIG ENDIAN
h = Sdds.SddsHeader(0)
p = Sdds.SddsShortPacket(h.header, fakeData_bs)
p.encode() # Defaults to big endian encoding
self.userver.send(p.encodedPacket)
time.sleep(0.05)
data,stream = self.getData()
self.assertEqual(self.comp.status.input_endianness, "1234", "Status property for endianness is not 1234")
self.assertEqual(data, fakeData, "Little Endian short did not match expected")
def testUnicastBadFsn(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
# Create packets and send
for i in range(0, 2):
h = Sdds.SddsHeader(1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data,stream = self.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 1024)
self.assertEqual(2*fakeData, list(struct.unpack('>1024H', struct.pack('>1024H', *data[:]))))
self.assertEqual(self.comp.status.dropped_packets, 65535)
def testUnicastShortPort(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
# Create packet and send
h = Sdds.SddsHeader(0, DM = [0, 1, 0], TTV = 1, TT = 0)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data,stream = self.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 512)
# Validate data is correct
self.assertEqual(fakeData, list(struct.unpack('>512H', struct.pack('>512H', *data))))
def testUnicastCxBit(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
# Create packet and send
h = Sdds.SddsHeader(0, SF = 0, TTV = 1, TT = 7820928000000000000, CX = 1, DM = [0, 1, 0])
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
data,stream = self.getData()
# Validate sri mode is correct
self.assertEqual(stream.sri.mode, 1)
def testShortBigEndianness(self):
self.setupComponent(endianness=BIG_ENDIAN)
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
sink = sb.DataSink()
# Connect components
self.comp.connect(sink, providesPortName='shortIn')
# Start components
self.comp.start()
sink.start()
# Create data
fakeData = [x for x in range(0, 512)]
h = Sdds.SddsHeader(0)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode() # Defaults to big endian encoding
self.userver.send(p.encodedPacket)
time.sleep(0.05)
data = sink.getData()
self.assertEqual(self.comp.status.input_endianness, "4321",
"Status property for endianness is not 4321")
self.assertEqual(data, fakeData,
"Big Endian short did not match expected")
def testMergeBulkIOSRI(self):
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Here we are using the BULKIO SRI with a modified xdelta and complex flag but the sdds xdelta and cx should merge in
sri = BULKIO.StreamSRI(hversion=1, xstart=0.0, xdelta=1.234e-9, xunits=1, subsize=0, ystart=0.0, ydelta=0.0, yunits=0, mode=0, streamID='StreamID1234', blocking=False, keywords=[])
self.setupComponent(sri=sri)
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
h = Sdds.SddsHeader(0, CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode() # Defaults to big endian encoding
self.userver.send(p.encodedPacket)
time.sleep(0.05)
data,stream = self.getData()
sri_rx = stream.sri
self.assertNotEqual(sri_rx.mode, sri.mode, "SDDS Packet Mode should have overridden the supplied SRI")
self.assertNotEqual(sri_rx.xdelta, sri.xdelta, "SDDS Packet xdelta should have overridden the supplied SRI")
self.assertEqual(sri_rx.streamID, sri.streamID, "Output SRI StreamID should have been inherited from the SRI")
def testUseBulkIOSRI(self):
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
sink = sb.DataSink()
# Connect components
self.comp.connect(sink, providesPortName='shortIn')
# Here we are using the BULKIO SRI with a modified xdelta and complex flag.
kw = [
CF.DataType("BULKIO_SRI_PRIORITY",
ossie.properties.to_tc_value(1, 'long'))
]
sri = BULKIO.StreamSRI(hversion=1,
xstart=0.0,
xdelta=1.234e-9,
xunits=1,
subsize=0,
ystart=0.0,
ydelta=0.0,
yunits=0,
mode=0,
streamID='TestStreamID',
blocking=False,
keywords=kw)
self.setupComponent(sri=sri)
# Start components
self.comp.start()
sink.start()
# Create data
fakeData = [x for x in range(0, 512)]
h = Sdds.SddsHeader(0, CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode() # Defaults to big endian encoding
self.userver.send(p.encodedPacket)
time.sleep(0.05)
data = sink.getData()
sri_rx = sink.sri()
# compareSRI does not work for CF.DataType with keywords so we check those first then zero them out
self.assertEqual(sri.keywords[0].id, sri_rx.keywords[0].id,
"SRI Keyword ID do not match")
self.assertEqual(sri.keywords[0].value.value(),
sri_rx.keywords[0].value.value(),
"SRI Keyword Value do not match")
self.assertEqual(sri.keywords[0].value.typecode(),
sri_rx.keywords[0].value.typecode(),
"SRI Keyword Type codes do not match")
sri.keywords = []
sri_rx.keywords = []
self.assertTrue(compareSRI(sri, sri_rx),
"Attach SRI does not match received SRI")
def testBulkIOTiming(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
pktNum = 0
sr=1e6
xdelta_ns=int(1/(sr) * 1e9)
time_ns=0
# No time slips here
while pktNum < 100:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4), CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns
time.sleep(0.5)
data,stream,tsamps = self.getData(wanttstamps=True)
now = datetime.datetime.utcnow()
first_of_year = datetime.datetime(now.year, 1, 1, tzinfo=UTC())
begin_of_time = datetime.datetime(1970, 1, 1, tzinfo=UTC())
seconds_since_new_year = timedelta_total_seconds(first_of_year - begin_of_time)
expected_time_ns = 0
# So we expect the received bulkIO stream to be the start of the year + the time delta from the sample rate.
for bulkIO_time in tsamps:
twsec = bulkIO_time[1].twsec
tfsec = bulkIO_time[1].tfsec
self.assertEqual(twsec, seconds_since_new_year, "BulkIO time stamp does not match received SDDS time stamp")
self.assertEqual(tfsec, expected_time_ns/1.0e9)
expected_time_ns = expected_time_ns + 512*xdelta_ns
def testWaitOnTTV(self):
'''
Wait on TTV will send nothing unless the pkt contains a TTV flag
'''
self.setupComponent(pkts_per_push=10)
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
self.comp.advanced_configuration.wait_on_ttv = True
sink = sb.DataSink()
# Connect components
self.comp.connect(sink, providesPortName='shortIn')
# Start components
self.comp.start()
sink.start()
ttv = 0
pktNum = 0
num_changes = 0
# We'll do a ttv change every 7th packet
while pktNum < 100:
if pktNum % 7 == 0:
ttv = (ttv + 1) % 2 # aka if 0 become 1, if 1 become 0
num_changes += 1
# Create data
fakeData = [x for x in range(0, 512)]
h = Sdds.SddsHeader(pktNum, TTV=ttv)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time.sleep(0.05)
data = sink.getData(tstamps=True)
self.assertEqual(
num_changes / 2, len(data[1]),
"The number of bulkIO pushes (" + str(len(data[1])) +
") does not match the expected (" + str(num_changes / 2) + ").")
self.comp.stop()
sink.stop()
def testEOSonDetach(self):
"""Checks that an EOS is sent on Detach"""
self.setupComponent()
# Get ports
compDataFloatOut_out = self.comp.getPort('dataShortOut')
sink = sb.DataSink()
# Connect components
self.comp.connect(sink, providesPortName='shortIn')
# Start components
self.comp.start()
sink.start()
compDataSddsIn = self.comp.getPort('dataSddsIn')
# Create data
fakeData = [x for x in range(0, 512)]
# Create packet and send
h = Sdds.SddsHeader(0, DM=[0, 1, 0], TTV=1, TT=0)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data = sink.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 512)
# Validate data is correct
self.assertEqual(
fakeData, list(struct.unpack('>512H', struct.pack('>512H',
*data))))
#Send Detach
compDataSddsIn.detach(self.attachId)
time.sleep(1)
data = sink.getData()
self.assertTrue(sink.eos())
def testXDeltaChange(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
sink = sb.DataSink()
# Connect components
self.comp.connect(sink, providesPortName='shortIn')
# Start components
self.comp.start()
sink.start()
# Create data
fakeData = [x for x in range(0, 512)]
pktNum = 0
sr = 1e6
xdelta_ns = int(1 / (sr) * 1e9)
time_ns = 0
# No time slips here
while pktNum < 100:
# Create data
h = Sdds.SddsHeader(pktNum,
FREQ=(sr * 73786976294.838211),
TT=(time_ns * 4),
CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512 * xdelta_ns
if pktNum > 50:
sr = 1e6 * 4
xdelta_ns = int(1 / (sr) * 1e9)
time.sleep(0.5)
self.assertEqual(
self.comp.status.time_slips, 0,
"There should be no time slips! However %s reported" %
self.comp.status.time_slips)
def testSddsPacketsPerBulkIOPush(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
sdds_pkts_per_push = (1, 2, 4, 8, 16, 32, 64)
for pkts_per_push in sdds_pkts_per_push:
self.comp.advanced_optimizations.sdds_pkts_per_bulkio_push = pkts_per_push
# Start components
self.comp.start()
num_sends = 0
data = []
sink = sb.StreamSink()
self.comp.connect(sink, providesPortName='shortIn')
while (not(data) and num_sends < 3*max(sdds_pkts_per_push)):
# Create data
fakeData = [x for x in range(0, 512)]
h = Sdds.SddsHeader(num_sends)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
num_sends = num_sends + 1
if num_sends != 0 and num_sends % 32 == 31:
num_sends = num_sends + 1
time.sleep(0.05)
packet = sink.port.getPacket()
if packet.dataBuffer:
data = packet.dataBuffer
# Validate correct amount of data was received
self.assertEqual(len(data), pkts_per_push * 512)
self.comp.stop()
def testUseBulkIOSRI(self):
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Here we are using the BULKIO SRI with a modified xdelta and complex flag.
# Adding other keywords to ensure they are passed through correctly
kw=[CF.DataType("BULKIO_SRI_PRIORITY", ossie.properties.to_tc_value(1, 'long'))]
kw.append(CF.DataType("Test_Keyword_string", ossie.properties.to_tc_value('test', 'string')))
kw.append(CF.DataType("Test_Keyword_long", ossie.properties.to_tc_value(10, 'long')))
kw.append(CF.DataType("COL_RF", ossie.properties.to_tc_value(100000000, 'double')))
sri = BULKIO.StreamSRI(hversion=1, xstart=0.0, xdelta=1.234e-9, xunits=1, subsize=0, ystart=0.0, ydelta=0.0, yunits=0, mode=0, streamID='TestStreamID', blocking=False, keywords=kw)
self.setupComponent(sri=sri)
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
h = Sdds.SddsHeader(0, CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode() # Defaults to big endian encoding
self.userver.send(p.encodedPacket)
time.sleep(0.05)
data,stream = self.getData()
sri_rx = stream.sri
# compareSRI does not work for CF.DataType with keywords so we check those first then zero them out
for index,keyword in enumerate(sri.keywords):
self.assertEqual(keyword.id, sri_rx.keywords[index].id, "SRI Keyword ID do not match")
self.assertEqual(keyword.value.value(), sri_rx.keywords[index].value.value(), "SRI Keyword Value do not match")
self.assertEqual(keyword.value.typecode().kind(), sri_rx.keywords[index].value.typecode().kind(), "SRI Keyword Type codes do not match")
sri.keywords = []
sri_rx.keywords = []
self.assertTrue(compareSRI(sri, sri_rx), "Attach SRI does not match received SRI")
def testTimeSlips(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
pktNum = 0
sr=1e6
xdelta_ns=int(1/sr * 1e9)
time_ns=0
# No time slips here
while pktNum < 100:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4))
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns
self.assertEqual(self.comp.status.time_slips, 0, "There should be no time slips!")
# Introduce accumulator time slip
while pktNum < 200:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4))
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns + 15 # The additional 15 ps is enough for ana cumulator time slip
self.assertEqual(self.comp.status.time_slips, 1, "There should be one time slip from the accumulator")
# Introduce one jump time slip
while pktNum < 300:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4))
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum == 245:
time_ns += 5000
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns
self.assertEqual(self.comp.status.time_slips, 2, "There should be one time slip from the jump time slip!")
def testRestartAfterDetach(self):
"""Checks that an Component will run after being detached and reattached without stopping """
self.setupComponent()
# Get ports
compDataFloatOut_out = self.comp.getPort('dataShortOut')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
compDataSddsIn = self.comp.getPort('dataSddsIn')
# Create data
fakeData = [x for x in range(0, 512)]
# Create packet and send
h = Sdds.SddsHeader(0, DM = [0, 1, 0], TTV = 1, TT = 0)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data,stream = self.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 512)
# Validate data is correct
self.assertEqual(fakeData, list(struct.unpack('>512H', struct.pack('>512H', *data))))
#Send Detach
compDataSddsIn.detach(self.attachId )
time.sleep(1)
# Get data
data,stream = self.getData()
self.assertTrue(stream.eos)
#Re-Attach
streamDef = BULKIO.SDDSStreamDefinition('id', BULKIO.SDDS_SI, self.uni_ip, 0, self.port, 8000, True, 'testing')
# Try to attach
self.attachId = ''
try:
self.attachId = compDataSddsIn.attach(streamDef, 'test')
except:
print "ATTACH FAILED"
attachId = ''
self.assertTrue(self.attachId != '', "Failed to attach to SourceSDDS component")
#Resend Data
self.userver.send(p.encodedPacket)
# Wait for data to be received
time.sleep(1)
# Get data
data,stream = self.getData()
# Validate correct amount of data was received
self.assertEqual(len(data), 512)
# Validate data is correct
self.assertEqual(fakeData, list(struct.unpack('>512H', struct.pack('>512H', *data))))
def testNonConformingConformingSwitch(self):
self.setupComponent()
# Get ports
compDataShortOut_out = self.comp.getPort('dataShortOut')
compDataSddsIn = self.comp.getPort('dataSddsIn')
# Connect components
self.comp.connect(self.sink, providesPortName='shortIn')
# Start components
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
pktNum = 0
sr=1e6
xdelta_ns=int(1/(sr*2) * 1e9)
time_ns=0
recSRI = False
# No time slips here
while pktNum < 100:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4), CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns
self.assertEqual(self.comp.status.time_slips, 0, "There should be no time slips!")
# Stop the component, detach, then re-attach a new stream that is using the conforming sampleRate
self.comp.stop()
compDataSddsIn.detach(self.attachId)
kw = [CF.DataType("dataRef", ossie.properties.to_tc_value(BIG_ENDIAN, 'long'))]
sri = BULKIO.StreamSRI(hversion=1, xstart=0.0, xdelta=1.0, xunits=1, subsize=0, ystart=0.0, ydelta=0.0, yunits=0, mode=0, streamID='TestStreamID2', blocking=False, keywords=kw)
compDataSddsIn.pushSRI(sri,timestamp.now())
streamDef = BULKIO.SDDSStreamDefinition('id2', BULKIO.SDDS_SI, self.uni_ip, 0, self.port, 8000, True, 'testing')
self.attachId = compDataSddsIn.attach(streamDef, 'test')
self.comp.start()
# Create data
fakeData = [x for x in range(0, 512)]
pktNum = 0
sr=1e6
xdelta_ns=int(1/(sr) * 1e9)
time_ns=0
recSRI = False
# No time slips here
while pktNum < 100:
# Create data
h = Sdds.SddsHeader(pktNum, FREQ=(sr*73786976294.838211), TT=(time_ns*4), CX=1)
p = Sdds.SddsShortPacket(h.header, fakeData)
p.encode()
self.userver.send(p.encodedPacket)
pktNum = pktNum + 1
if pktNum != 0 and pktNum % 32 == 31:
pktNum = pktNum + 1
time_ns = time_ns + 512*xdelta_ns
self.assertEqual(self.comp.status.time_slips, 0, "There should be no time slips!")