Fix split buffer with inconsistently delimited json objects.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

tests/integration/testcases.py

@@ -9,8 +9,6 @@ from compose.config.config import ServiceLoader
 from compose.const import LABEL_PROJECT
 from compose.progress_stream import stream_output
 from compose.service import Service
-from compose.utils import split_buffer
-from compose.utils import stream_as_text
 
 
 def pull_busybox(client):
@@ -73,5 +71,5 @@ class DockerClientTestCase(unittest.TestCase):
 
     def check_build(self, *args, **kwargs):
         kwargs.setdefault('rm', True)
-        build_output = stream_as_text(self.client.build(*args, **kwargs))
-        stream_output(split_buffer(build_output), open('/dev/null', 'w'))
+        build_output = self.client.build(*args, **kwargs)
+        stream_output(build_output, open('/dev/null', 'w'))

tests/unit/split_buffer_test.py

@@ -47,7 +47,7 @@ class SplitBufferTest(unittest.TestCase):
         self.assert_produces(reader, [string])
 
     def assert_produces(self, reader, expectations):
-        split = split_buffer(reader(), u'\n')
+        split = split_buffer(reader())
 
         for (actual, expected) in zip(split, expectations):
             self.assertEqual(type(actual), type(expected))

tests/unit/utils_test.py

@@ -0,0 +1,16 @@
+from .. import unittest
+from compose import utils
+
+
+class JsonSplitterTestCase(unittest.TestCase):
+
+    def test_json_splitter_no_object(self):
+        data = '{"foo": "bar'
+        self.assertEqual(utils.json_splitter(data), (None, None))
+
+    def test_json_splitter_with_object(self):
+        data = '{"foo": "bar"}\n  \n{"next": "obj"}'
+        self.assertEqual(
+            utils.json_splitter(data),
+            ({'foo': 'bar'}, '{"next": "obj"}')
+        )