Update cloud-sql/postgres sample (#1553)

Update Node version to 10 for GAE Standard.
Delete repo-tools.
Clean up package.json

cloud-sql/postgres/knex/app.standard.yaml

@@ -11,7 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: nodejs8
+runtime: nodejs10
 
 # The following env variables may contain sensitive information that grants
 # anyone access to your database. Do not add this file to your source control.

cloud-sql/postgres/knex/package.json

@@ -10,15 +10,11 @@
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
   },
   "engines": {
-    "node": ">=8.0.0"
+    "node": ">=10.0.0"
   },
   "scripts": {
-    "unit-test": "mocha test/*.test.js --timeout=60000 --exit",
     "start-proxy": "! pgrep cloud_sql_proxy > /dev/null && cloud_sql_proxy -dir=/cloudsql -instances=$CLOUD_SQL_INSTANCE_NAME &",
-    "system-test": "repo-tools test app -- server.js",
-    "system-test-proxy": "npm run start-proxy; npm run system-test",
-    "all-test": "npm run unit-test && npm run system-test",
-    "test": "repo-tools test run --cmd npm -- run all-test"
+    "test": "mocha test/*.test.js --timeout=60000 --exit"
   },
   "dependencies": {
     "@google-cloud/logging-winston": "^3.0.0",
@@ -31,7 +27,6 @@
     "yargs": "^15.0.0"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "3.3.0",
     "mocha": "^6.0.0",
     "supertest": "^4.0.0"
   }

cloud-sql/postgres/knex/test/createTable.test.js

@@ -17,7 +17,7 @@
 const assert = require('assert');
 const path = require('path');
 const Knex = require('knex');
-const tools = require('@google-cloud/nodejs-repo-tools');
+const {exec} = require('child_process');
 
 const cwd = path.join(__dirname, '..');
 
@@ -41,20 +41,25 @@ before(async () => {
   }
 });
 
-it('should create a table', async () => {
-  const output = await tools.runAsync(
+it('should create a table', done => {
+  exec(
     `node createTable.js ${DB_USER} ${DB_PASS} ${DB_NAME} ${CONNECTION_NAME}`,
-    cwd
+    {cwd},
+    (err, stdout) => {
+      assert.ok(stdout.includes(`Successfully created 'votes' table.`));
+      done();
+    }
   );
-  assert.ok(output.includes(`Successfully created 'votes' table.`));
 });
 
-it('should handle existing tables', async () => {
-  const {stderr} = await tools.runAsyncWithIO(
+it('should handle existing tables', done => {
+  exec(
     `node createTable.js ${DB_USER} ${DB_PASS} ${DB_NAME} ${CONNECTION_NAME}`,
-    cwd
+    {cwd},
+    (err, stdout, stderr) => {
+      assert.ok(stderr.includes("Failed to create 'votes' table:"));
+      assert.ok(stderr.includes('already exists'));
+      done();
+    }
   );
-
-  assert.ok(stderr.includes("Failed to create 'votes' table:"));
-  assert.ok(stderr.includes('already exists'));
 });