Revised Integration Tests

This directory builds a Docker image for Druid, then uses that image, along with test configuration to run tests. This version greatly evolves the integration tests from the earlier form. See the History section for details.

Shortcuts

List of the most common commands once you're familiar with the framework. If you are new to the framework, see Quickstart for an explanation.

Build Druid

To make the text a bit simpler, define a variable for the standard settings:

export MAVEN_IGNORE=-P skip-static-checks,skip-tests -Dmaven.javadoc.skip=true

```bash
mvn clean package -P dist $MAVEN_IGNORE -T1.0C

Build the Test Image

cd $DRUID_DEV/integration-tests-ex/image
mvn install -P test-image $MAVEN_IGNORE

Run an IT from the Command Line

mvn verify -P IT-<category> -pl :druid-it-cases $MAVEN_IGNORE

Where <category> is one of the test categories.

Or

cd $DRUID_DEV/integration-tests-ex/cases
mvn verify -P skip-static-checks,docker-tests,IT-<category> \
    -Dmaven.javadoc.skip=true -DskipUTs=true \
    -pl :druid-it-cases

Run an IT from the IDE

Start the cluster:

cd $DRUID_DEV/integration-tests-ex/cases
./cluster.sh <category> up

Where <category> is one of the test categories. Then launch the test as a JUnit test.

Contents

• Goals
• Quickstart
• Create a new test
• Maven configuration
• Travis integration
• Docker image
• Druid configuration
• Docker Compose configuration
• Test configuration
• Test structure
• Test runtime semantics
• Scripts
• Dependencies
• Debugging

Background information

• Next steps
• Test conversion - How to convert existing tests.
• History - Comparison with prior integration tests.

Goals

The goal of the present version is to simplify development.

• Speed up the Druid test image build by avoiding download of dependencies. (Instead, any such dependencies are managed by Maven and reside in the local build cache.)
• Use official images for dependencies to avoid the need to download, install, and manage those dependencies.
• Make it is easy to manually build the image, launch a cluster, and run a test against the cluster.
• Convert tests to JUnit so that they will easily run in your favorite IDE, just like other Druid tests.
• Use the actual Druid build from distribution so we know what is tested.
• Leverage, don't fight, Maven.
• Run the integration tests easily on a typical development machine.

By meeting these goals, you can quickly:

• Build the Druid distribution.
• Build the Druid image. (< 1 minute)
• Launch the cluster for the particular test. (a few seconds)
• Run the test any number of times in your debugger.
• Clean up the test artifacts.

The result is that the fastest path to develop a Druid patch or feature is:

• Create a normal unit test and run it to verify your code.
• Create an integration test that double-checks the code in a live cluster.