refactor sample doc

samples/batch-write.js

@@ -13,6 +13,10 @@
  * limitations under the License.
  */
 
+// sample-metadata:
+//  title: Performs batch write operation.
+//  usage: node batch-write.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>
+
 'use strict';
 
 async function main(

samples/system-test/spanner.test.js

@@ -827,18 +827,6 @@ describe('Autogenerated Admin Clients', () => {
     );
   });
 
-  // batch_write
-  it('should perform CRUD operations using batch write', async () => {
-    const output = execSync(
-      `${batchWriteCmd} ${INSTANCE_ID} ${DATABASE_ID} ${PROJECT_ID}`
-    ).toString();
-    assert.match(
-      output,
-      /Mutation group indexes [\d,]+ have been applied with commit timestamp \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+Z/
-    );
-    assert.include(output, 'Mutations applied successfully');
-  });
-
   // dml_standard_insert
   it('should insert rows into an example table using a DML statement', async () => {
     const output = execSync(
@@ -980,6 +968,18 @@ describe('Autogenerated Admin Clients', () => {
     assert.match(output, new RegExp('Virginia Watson'));
   });
 
+  // batch_write
+  it('should perform CRUD operations using batch write', async () => {
+    const output = execSync(
+      `${batchWriteCmd} ${INSTANCE_ID} ${DATABASE_ID} ${PROJECT_ID}`
+    ).toString();
+    assert.match(
+      output,
+      /Mutation group indexes [\d,]+ have been applied with commit timestamp \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+Z/
+    );
+    assert.include(output, 'Mutations applied successfully');
+  });
+
   // create_table_with_datatypes
   it('should create Venues example table with supported datatype columns', async () => {
     const output = execSync(