def testValidProfile(self):
    output_dir = test.get_temp_dir()
    run_metadata = config_pb2.RunMetadata()

    node1 = step_stats_pb2.NodeExecStats(
        node_name='Add/123',
        op_start_rel_micros=3,
        op_end_rel_micros=5,
        all_end_rel_micros=4)

    run_metadata = config_pb2.RunMetadata()
    device1 = run_metadata.step_stats.dev_stats.add()
    device1.device = 'deviceA'
    device1.node_stats.extend([node1])

    graph = test.mock.MagicMock()
    op1 = test.mock.MagicMock()
    op1.name = 'Add/123'
    op1.traceback = [
        ('a/b/file1', 10, 'apply_op', 'abc'), ('a/c/file2', 12, 'my_op', 'def')]
    op1.type = 'add'
    graph.get_operations.return_value = [op1]

    expected_proto = """sample_type {