def test_rate(self):
t = DeltaTransform(rate=True)
# First record, there's nothing to "delta" with
self.assertEqual(
t.transform({
'timestamp': 1,
'fields': {
'variable': 15
}
}), None)
# Second record, at timestamp 3, has a delta of +5
self.assertEqual(
t.transform({
'timestamp': 3,
'fields': {
'variable': 20
}
}), {
'timestamp': 3,
'fields': {
'variable': 2.5
}
})
# Third record, at timestamp 10, has a delta of -30
self.assertEqual(
t.transform({
'timestamp': 13,
'fields': {
'variable': -10
}
}), {
'timestamp': 13,
'fields': {
'variable': -3
}
})
# Try again, this time with multiple variables and only one of
# them as a rate.
t = DeltaTransform(rate=['v1'])
# First record, there's nothing to "delta" with
self.assertEqual(
t.transform({
'timestamp': 1,
'fields': {
'v1': 15,
'v2': 15
}
}), None)
# Second record, at timestamp 3, has a delta of +5
self.assertEqual(
t.transform({
'timestamp': 3,
'fields': {
'v1': 20,
'v2': 20
}
}), {
'timestamp': 3,
'fields': {
'v1': 2.5,
'v2': 5
}
})
# Third record, at timestamp 10, has a delta of -30, and is missing v2
self.assertEqual(t.transform({
'timestamp': 13,
'fields': {
'v1': -10
}
}), {
'timestamp': 13,
'fields': {
'v1': -3
}
})
# Check that we flag bad timestamps - this should log a warning about
# encountering negative time, and should return None
with self.assertLogs(logging.getLogger(), logging.WARNING):
self.assertEqual(
t.transform({
'timestamp': 1,
'fields': {
'v1': -10
}
}), None)
def test_default(self):
t = DeltaTransform(field_type={'gyroheading': 'polar'})
alpha = {'timestamp': 1, 'fields': {'gyroheading': 15}}
# First time through, no results
self.assertEqual(t.transform(alpha), None)
beta = {'timestamp': 3, 'fields': {'gyroheading': 359, 'seatemp': 20}}
results = t.transform(beta)
self.assertEqual(results['fields'].get('gyroheading'), -16)
self.assertEqual(results['fields'].get('seatemp', None), None)
# Simple transform with no special field types
t = DeltaTransform()
# First record, there's nothing to "delta" with
self.assertEqual(
t.transform({
'timestamp': 1,
'fields': {
'variable': 15
}
}), None)
# Second record, at timestamp 2, has a delta of +5
self.assertEqual(
t.transform({
'timestamp': 2,
'fields': {
'variable': 20,
'variable2': 10
}
}), {
'timestamp': 2,
'fields': {
'variable': 5
}
})
# Third record, at timestamp 10, has a delta of -30
self.assertEqual(
t.transform({
'timestamp': 10,
'fields': {
'variable': -10,
'variable2': 15
}
}), {
'timestamp': 10,
'fields': {
'variable': -30,
'variable2': 5
}
})
# Check that, when given a DASRecord, it returns one
record = DASRecord(timestamp=11,
fields={
'variable': -9,
'variable2': 17
})
result = t.transform(record)
expected = DASRecord(timestamp=11,
fields={
'variable': 1,
'variable2': 2
})
self.assertEqual(result, expected)