test for emulate_tty configuration

Signed-off-by: Daniel Stonier <[email protected]>

launch/test/launch/test_emulate_tty.py

@@ -0,0 +1,52 @@
+# Copyright 2018 Open Source Robotics Foundation, Inc.
+#
+# 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.
+
+"""Tests for emulate_tty configuration of ExecuteProcess actions."""
+
+import sys
+
+import launch
+import pytest
+
+
+class OnExit(object):
+    def __init__(self):
+        self.returncode = None
+
+    def handle(self, event, context):
+        self.returncode = event.returncode
+
+
+@pytest.mark.parametrize('test_input,expected', [
+    (None, 1),  # use the default defined by ExecuteProcess
+    ('true', 1),  # redundantly override the default via LaunchConfiguration
+    ('false', 0)  # override the default via LaunchConfiguration
+])
+def test_emulate_tty(test_input, expected):
+    on_exit = OnExit()
+    ld = launch.LaunchDescription()
+    ld.add_action(launch.actions.ExecuteProcess(
+        cmd=[sys.executable, '-c', 'import sys; sys.exit(sys.stdout.isatty())'])
+    )
+    if test_input is not None:
+        ld.add_action(launch.actions.SetLaunchConfiguration('emulate_tty', test_input))
+    ld.add_action(
+        launch.actions.RegisterEventHandler(
+            launch.event_handlers.OnProcessExit(on_exit=on_exit.handle)
+        )
+    )
+    ls = launch.LaunchService()
+    ls.include_launch_description(ld)
+    ls.run()
+    assert on_exit.returncode == expected