How can I make integration tests with google cloud

We are in the processing of migrating from apache hbase to bigquery.

Currently we have end to end tests (using cucumbers) that work with a docker container running hbase.

There don't seem to be any bigquery docker containers or emulators (https://cloud.google.com/sdk/gcloud/reference/beta/emulators/)

How would we be able to create end to end tests for an application working with bigquery?

Currently there is not any kind of BigQuery local emulator or anything similar to that. As pointed out by the link you shared about available GCP emulators, there are some other products that have such a feature, but probably the reason why BigQuery does not have one is that its true potential is only seen when working in its real infrastructure, plus the fact that the costs of working with BigQuery can be relatively low depending on the usage you make of it, plus you have a Free Tier to start working with.

Let me summarize some info about BigQuery pricing that can be useful for you:

BigQuery storage and operation costs are summarized in the pricing documentation.
BigQuery offers some operations that are free of charge.
There's a Storage free tier with 10GB of free storage. It may not be a lot, given that BQ is designed to work with enormous amounts of data, but it can be a good starting point to do some tests.
There's also an Operations free tier, where the first TeraByte of processed data (per month) is free of charge.
You can set up alerts in order to monitor usage with Stackdriver, using the available metrics.

In any case, if you still think that working with BigQuery directly is not the best option for you, can always forward your requests to the Engineering team by creating a Feature Request in the Public Issue Tracker for BigQuery, although it will be in hands of the engineering team whether to decide if (and when) to implement such a feature, even more considering the complexity of BigQuery and that its performance is optimized for working in its current architecture.