travis: enable code coverage reporting. (#516)

tests/scripts/thread-cert/node.py

@@ -98,7 +98,10 @@ class Node:
 
     def __del__(self):
         if self.pexpect.isalive():
-            if self.node_type == 'ncp-sim':
+            if self.node_type == 'sim':
+                self.send_command('exit')
+                self.pexpect.expect('Done')
+            elif self.node_type == 'ncp-sim':
                 self.pexpect.sendcontrol('c');
             self.pexpect.terminate()
             self.pexpect.close(force=True)

tests/unit/Makefile.am

@@ -142,6 +142,10 @@ test_diag_LDADD              = $(top_builddir)/src/diag/libopenthread-diag.a
 test_diag_SOURCES            = test_diag.cpp
 endif
 
+if OPENTHREAD_BUILD_COVERAGE
+CLEANFILES                   = $(wildcard *.gcda *.gcno)
+endif # OPENTHREAD_BUILD_COVERAGE
+
 endif # OPENTHREAD_BUILD_TESTS
 
 include $(abs_top_nlbuild_autotools_dir)/automake/post.am