Fix api test, fix testing script for macos

Author: reyoung

paddle/api/test/run_tests.sh

@@ -20,11 +20,7 @@ popd > /dev/null
 
 cd $SCRIPTPATH
 
-if [ ! -f ../../dist/*.whl ] ; then  # Swig not compiled.
-  exit 0
-fi
-
-rm .test_env -rf
+rm -rf .test_env
 virtualenv .test_env
 source .test_env/bin/activate
 

paddle/trainer/Tester.cpp

@@ -66,7 +66,9 @@ Tester::Tester(const std::shared_ptr<TrainerConfigHelper>& config,
 }
 
 void Tester::startTestPeriod() {
-  testDataProvider_->reset();
+  if (testDataProvider_) {
+    testDataProvider_->reset();
+  }
   testEvaluator_->start();
   testContext_.cost = 0;
   testContext_.numSamples = 0;