Add bindings/python/babeltrace/test_ctf_writer.py test

This test ensures that we can use the legacy Python bindings to create a
CTF trace without caring about timestamp fields (they should be
automatically updated from the stream's class's clock value).

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/tests/bindings/python/babeltrace/test_ctf_writer.py b/tests/bindings/python/babeltrace/test_ctf_writer.py
new file mode 100644 (file)
index 0000000..e5096c7
--- /dev/null
+++ b/tests/bindings/python/babeltrace/test_ctf_writer.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+#
+# The MIT License (MIT)
+#
+# Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import tempfile
+import babeltrace.writer as btw
+import babeltrace.reader as btr
+import shutil
+import uuid
+import unittest
+
+class CtfWriterTestCase(unittest.TestCase):
+    def setUp(self):
+        self._expected_event_count = 100
+        self._trace_path = tempfile.mkdtemp()
+
+    def tearDown(self):
+        shutil.rmtree(self._trace_path)
+
+    def _create_trace(self):
+        trace = btw.Writer(self._trace_path)
+        clock = btw.Clock('test_clock')
+        trace.add_clock(clock)
+
+        integer_field_type = btw.IntegerFieldDeclaration(32)
+
+        event_class = btw.EventClass('simple_event')
+        event_class.add_field(integer_field_type, 'int_field')
+
+        stream_class = btw.StreamClass('empty_packet_stream')
+        stream_class.add_event_class(event_class)
+        stream_class.clock = clock
+
+        stream = trace.create_stream(stream_class)
+
+        for j in range(2):
+            for i in range(self._expected_event_count // 2):
+                val = i * (j + 1)
+                clock.time = val * 200
+                event = btw.Event(event_class)
+                event.payload('int_field').value = val
+                stream.append_event(event)
+
+            stream.flush()
+
+    def test_writer(self):
+        self._create_trace()
+
+        traces = btr.TraceCollection()
+        trace_handle = traces.add_trace(self._trace_path, 'ctf')
+        self.assertIsNotNone(trace_handle)
+
+        event_count = sum(1 for event in traces.events)
+        self.assertEqual(self._expected_event_count, event_count)
+
+        self.assertEqual(traces.timestamp_begin, 0)
+        self.assertEqual(traces.timestamp_end, 19600)