1. Start the local Datastore emulator before running your tests using `LocalDatastoreHelper`'s `create` and `start` methods. This will create a temporary folder on your computer and bind a port for communication with the local Datastore. There is an optional argument for `create`: consistency. The consistency setting controls the fraction of Datastore writes that are immediately visible in global queries.

```java

// Use the default consistency setting of 0.9

LocalDatastoreHelper helper = LocalDatastoreHelper.create();

// or explicitly set the consistency

helper = LocalDatastoreHelper.create(0.6);

helper.start(); // Starts the local Datastore emulator in a separate process

```

2. Create and use a `Datastore` object with the options given by the `LocalDatastoreHelper` instance. For example:

```java

Datastore localDatastore = helper.getOptions().getService();

```

3. Run your tests.

4. Stop the local datastore emulator by calling the `stop()` method, like so:

```java

helper.stop();

```

You can test against a remote Datastore emulator as well. To do this, set the `DatastoreOptions` project endpoint to the hostname of the remote machine, like the example below.

```java

DatastoreOptions options = DatastoreOptions.newBuilder()

.setProjectId("my-project-id") // must match project ID specified on remote machine

.setHost("http://<hostname of machine>:<port>")

.setCredentials(NoCredentials.getInstance())

.build();

Datastore localDatastore = options.getService();

```

We recommend that you start the emulator on the remote machine using the [Google Cloud SDK](https://cloud.google.com/sdk/gcloud/reference/beta/emulators/datastore/) from command line, as shown below: