diff --git a/ci/travis/test-wheels.sh b/ci/travis/test-wheels.sh
index e0a3bbdd7..1e22e6e7a 100755
--- a/ci/travis/test-wheels.sh
+++ b/ci/travis/test-wheels.sh
@@ -21,8 +21,8 @@ else
   exit 1
 fi
 
-# TEST_SCRIPT="tests/test_microbenchmarks.py"
-# UI_TEST_SCRIPT="tests/test_webui.py"
+TEST_SCRIPT="$TRAVIS_BUILD_DIR/python/ray/tests/test_microbenchmarks.py"
+UI_TEST_SCRIPT="$TRAVIS_BUILD_DIR/python/ray/tests/test_webui.py"
 
 if [[ "$platform" == "linux" ]]; then
   # First test Python 2.7.
@@ -42,7 +42,7 @@ if [[ "$platform" == "linux" ]]; then
 
   # Run a simple test script to make sure that the wheel works.
   INSTALLED_RAY_DIRECTORY=$(dirname "$($PYTHON_EXE -u -c "import ray; print(ray.__file__)" | tail -n1)")
-  # $PYTHON_EXE -m pytest -v "$INSTALLED_RAY_DIRECTORY/$TEST_SCRIPT"
+  $PYTHON_EXE "$TEST_SCRIPT"
 
   # Now test Python 3.6.
 
@@ -61,11 +61,11 @@ if [[ "$platform" == "linux" ]]; then
 
   # Run a simple test script to make sure that the wheel works.
   INSTALLED_RAY_DIRECTORY=$(dirname "$($PYTHON_EXE -u -c "import ray; print(ray.__file__)" | tail -n1)")
-  # $PYTHON_EXE -m pytest -v "$INSTALLED_RAY_DIRECTORY/$TEST_SCRIPT"
+  $PYTHON_EXE "$TEST_SCRIPT"
 
   # Run the UI test to make sure that the packaged UI works.
-  # $PIP_CMD install -q aiohttp google grpcio psutil requests setproctitle
-  # $PYTHON_EXE -m pytest -v "$INSTALLED_RAY_DIRECTORY/$UI_TEST_SCRIPT"
+  $PIP_CMD install -q aiohttp google grpcio psutil requests setproctitle
+  $PYTHON_EXE "$UI_TEST_SCRIPT"
 
   # Check that the other wheels are present.
   NUMBER_OF_WHEELS=$(ls -1q "$ROOT_DIR"/../../.whl/*.whl | wc -l)
@@ -102,13 +102,14 @@ elif [[ "$platform" == "macosx" ]]; then
 
     # Run a simple test script to make sure that the wheel works.
     INSTALLED_RAY_DIRECTORY=$(dirname "$($PYTHON_EXE -u -c "import ray; print(ray.__file__)" | tail -n1)")
-    # $PYTHON_EXE -m pytest -v "$INSTALLED_RAY_DIRECTORY/$TEST_SCRIPT"
+    $PYTHON_EXE "$TEST_SCRIPT"
 
-    # if (( $(echo "$PY_MM >= 3.0" | bc) )); then
+    if (( $(echo "$PY_MM >= 3.0" | bc) )); then
       # Run the UI test to make sure that the packaged UI works.
-      # $PIP_CMD install -q aiohttp google grpcio psutil requests setproctitle
-      # $PYTHON_EXE -m pytest -v "$INSTALLED_RAY_DIRECTORY/$UI_TEST_SCRIPT"
-    # fi
+      $PIP_CMD install -q aiohttp google grpcio psutil requests setproctitle
+      $PYTHON_EXE "$UI_TEST_SCRIPT"
+    fi
+
   done
 else
   echo "Unrecognized environment."