Try to fix travis build

Author: miloyip

test/unittest/namespacetest.cpp

@@ -12,6 +12,10 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 // specific language governing permissions and limitations under the License.
 
+// Not throwing exception for this test
+#include <cassert>
+#define RAPIDJSON_ASSERT(x) assert(x)
+
 #include "unittest.h"
 
 // test another instantiation of RapidJSON in a different namespace 

test/unittest/unittest.h

@@ -117,7 +117,9 @@ class AssertException : public std::logic_error {
 #pragma GCC diagnostic pop
 #endif
 
+#ifndef RAPIDJSON_ASSERT
 #define RAPIDJSON_ASSERT(x) (!(x) ? throw AssertException(RAPIDJSON_STRINGIFY(x)) : (void)0u)
+#endif
 
 class Random {
 public: