# Copyright 2017, OpenCensus Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import unittest

from opencensus.trace.tracers import noop_tracer


class TestNoopTracer(unittest.TestCase):

    def test_list_collected_spans(self):
        tracer = noop_tracer.NoopTracer()

        spans = tracer.list_collected_spans()

        self.assertIsNone(spans)
