Fix Python3 RawInputClient error, add test

geomagio/edge/RawInputClient.py

-from builtins import range
+from __future__ import unicode_literals
+from builtins import range, str
 
 import socket  # noqa
 import struct
@@ -132,7 +133,10 @@ class RawInputClient():
         the correct length.  We only expect observatory to ever be of an
         incorrect length.
         """
-        return str(network + observatory.ljust(5) + channel + location)
+        return str.encode(network +
+                observatory.ljust(5) +
+                channel +
+                location)
 
     def forceout(self):
         """ force edge to recognize data

test/edge_test/RawInputFactory_test.py

+"""Tests for RawInputFactory.py"""
+
+import numpy
+from obspy.core import Stats, Trace, UTCDateTime
+from geomagio.edge import EdgeFactory, RawInputClient
+from nose.tools import assert_equals
+
+
+class TestRawInputClient(RawInputClient):
+    def __init__(self, **kwargs):
+        RawInputClient.__init__(self, **kwargs)
+        self.last_send = []
+
+    def _send(self, buf):
+        """stub out send method to capture data that would be sent."""
+        self.last_send.append(buf)
+
+
+def test_raw_input_client():
+    """edge_test.RawInputClient_test.test_raw_input_client()
+    """
+    network = 'NT'
+    station = 'BOU'
+    channel = 'MVH'
+    location = 'R0'
+    data = [0, 1, 2, 3, 4, 5]
+    starttime = UTCDateTime('2019-12-01')
+
+    trace = Trace(
+            numpy.array(data, dtype=numpy.float64),
+            Stats({
+                'channel': channel,
+                'delta': 60.0,
+                'location': location,
+                'network': network,
+                'npts': len(data),
+                'starttime': starttime,
+                'station': station
+            }))
+
+    client = TestRawInputClient(tag='tag', host='host', port='port',
+            station=station, channel=channel,
+            location=location, network=network)
+    trace_send = EdgeFactory()._convert_trace_to_int(trace.copy())
+    client.send_trace('minute', trace_send)
+    # verify data was sent
+    assert_equals(len(client.last_send), 1)