Simple rostest example in python

I'll use this as an example to write a rust library that works with
rostest.

Author: jonbinney

CMakeLists.txt

@@ -3,3 +3,7 @@ project(ros_rust)
 
 catkin_package()
 
+if(CATKIN_ENABLE_TESTING)
+    find_package(rostest REQUIRED)
+    add_rostest(test/empty.test)
+endif()

scripts/test_empty

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+import re
+import sys
+
+filename_out = None
+f = open('/tmp/foo', 'w+')
+f.write(str(sys.argv))
+for arg in sys.argv[1:]:
+    m = re.match('--gtest_output=xml:(.+.xml)', arg)
+    if m is not None:
+        print >> f, m.groups()[0]
+        filename_out = m.groups()[0]
+f.close()
+
+output = '''\
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuites tests="3" failures="1" errors="0" time="35" name="AllTests">
+  <testsuite name="MathTest" tests="2" failures="1" errors="0" time="15">
+    <testcase name="Addition" status="run" time="7" classname="">
+      <failure message="Value of: add(1, 1)&#x0A; Actual: 3&#x0A;Expected: 2" type=""/>
+      <failure message="Value of: add(1, -1)&#x0A; Actual: 1&#x0A;Expected: 0" type=""/>
+    </testcase>
+    <testcase name="Subtraction" status="run" time="5" classname="">
+    </testcase>
+  </testsuite>
+  <testsuite name="LogicTest" tests="1" failures="0" errors="0" time="5">
+    <testcase name="NonContradiction" status="run" time="5" classname="">
+    </testcase>
+  </testsuite>
+</testsuites>
+'''
+
+if filename_out is not None:
+    f_out = open(filename_out, 'w+')
+    f_out.write(output)
+    f_out.close()
+
+

test/empty.test

@@ -0,0 +1,3 @@
+<launch>
+  <test test-name="test_empty_node" pkg="ros_rust" type="test_empty" />
+</launch>