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Added a test to read strings for all steps at once in python #2544

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Dec 11, 2020
Merged

Added a test to read strings for all steps at once in python #2544

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25 changes: 20 additions & 5 deletions testing/adios2/bindings/python/TestBPWriteReadString.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,19 +11,21 @@
from mpi4py import MPI
import adios2

N_STEPS = 3


class TestAdiosWriteReadStringfullAPI(unittest.TestCase):

def test_write_read_string_fullAPI(self):
comm = MPI.COMM_WORLD
theString = 'hello adios'
bpFilename = 'string_test_fullAPI.bp'
varname = 'mystringvar'
NSteps = 3
adios = adios2.ADIOS(comm)
ioWrite = adios.DeclareIO('ioWriter')
adEngine = ioWrite.Open(bpFilename, adios2.Mode.Write)
varMyString = ioWrite.DefineVariable(varname)
for step in range(NSteps):
for step in range(N_STEPS):
adEngine.BeginStep()
adEngine.Put(varMyString, theString + str(step))
adEngine.EndStep()
Expand All @@ -32,7 +34,7 @@ def test_write_read_string_fullAPI(self):
ioRead = adios.DeclareIO('ioReader')
adEngine = ioRead.Open(bpFilename, adios2.Mode.Read)
varReadMyString = ioRead.InquireVariable(varname)
for step in range(NSteps):
for step in range(N_STEPS):
adEngine.BeginStep()
result = adEngine.Get(varReadMyString)
adEngine.EndStep()
Expand All @@ -44,11 +46,10 @@ def test_write_read_string_highAPI(self):
theString = 'hello adios'
bpFilename = 'string_test_highAPI.bp'
varname = 'mystringvar'
NSteps = 3

with adios2.open(bpFilename, "w", comm) as fh:

for step in range(NSteps):
for step in range(N_STEPS):
fh.write(varname, theString + str(step), end_step=True)

with adios2.open(bpFilename, "r", comm) as fh:
Expand All @@ -58,6 +59,20 @@ def test_write_read_string_highAPI(self):
self.assertEqual("".join([chr(s) for s in result]),
theString + str(step))

def test_read_strings_all_steps(self):
fileName = 'string_test_all.bp'
with adios2.open(fileName, "w") as fh:
for i in range(N_STEPS):
fh.write("string_variable", "written {}".format(i))
fh.end_step()

with adios2.open(fileName, "r") as fh:
n = fh.steps()
name = "string_variable"
result = fh.read_string(name, 0, n)
expected_str = ["written {}".format(i) for i in range(n)]
self.assertEqual(result, expected_str)


if __name__ == '__main__':
unittest.main()