fix samples test by adding approprate test variables

.kokoro/pre-samples-test.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+. .kokoro/setup-vars.sh

.kokoro/pre-system-test.sh

@@ -14,10 +14,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# nodejs-storage's system tests require additional project and
-# system test key
-export GCN_STORAGE_2ND_PROJECT_ID=gcloud-node-whitelist-ci-tests
-export GCN_STORAGE_2ND_PROJECT_KEY=${KOKORO_GFILE_DIR}/no-whitelist-key.json
-
-export GOOGLE_CLOUD_KMS_KEY_ASIA="projects/long-door-651/locations/asia/keyRings/test-key-asia/cryptoKeys/test-key-asia"
-export GOOGLE_CLOUD_KMS_KEY_US="projects/long-door-651/locations/us/keyRings/test-key-us/cryptoKeys/test-key-us"
+. .kokoro/setup-vars.sh

.kokoro/setup-vars.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# nodejs-storage's system tests require additional project and
+# system test key
+export GCN_STORAGE_2ND_PROJECT_ID=gcloud-node-whitelist-ci-tests
+export GCN_STORAGE_2ND_PROJECT_KEY=${KOKORO_GFILE_DIR}/no-whitelist-key.json
+
+export GOOGLE_CLOUD_KMS_KEY_ASIA="projects/long-door-651/locations/asia/keyRings/test-key-asia/cryptoKeys/test-key-asia"
+export GOOGLE_CLOUD_KMS_KEY_US="projects/long-door-651/locations/us/keyRings/test-key-us/cryptoKeys/test-key-us"