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Testing JanusGraph

Audience of this Document

This page is written for developers familiar with Java, JanusGraph, and Maven who want information on how to run JanusGraph's test suite.

Overview

JanusGraph runs all tests using JUnit. To compile, package, and run the default test suite for JanusGraph, use the standard mvn clean install command.

JanusGraph has a specialty tests, disabled by default, intended to generate basic performance metrics or stress its cache structures under memory pressure. The next section describes how JanusGraph's tests are internally categorized and the Maven options that enabled/disable test categories.

Continuous Integration

JanusGraph runs continuous integration via Travis; see the dashboard for current status.

Travis sends emails on test failures and status transitions (to/from failure) to [email protected] mailing list.

JUnit

JUnit Test Tags

All of JanusGraph's tests are written for JUnit. JanusGraph's JUnit tests are annotated with the following JUnit Tags:

Category Name Maven Property Default Comment
MEMORY_TESTS test.skip.mem true (disabled) Tests intended to exert memory pressure
PERFORMANCE_TESTS test.skip.perf true (disabled) Tests written as simple speed tests using JUnitBenchmarks
(No tag) test.skip.default false (enabled) Tests without any Tag annotations

Tag Name above is a Java interface defined in the package org.janusgraph.testcategory. These interfaces appear as arguments to the JUnit @Tag(...) annotation, e.g. @Tag(TestCategory.MEMORY_TESTS).

Maven Property above is a boolean-valued pom.xml property that skips the associated test tag when true and executes the associated test tag when false. The default values defined in pom.xml can be overridden on the command-line in the ordinary Maven way, e.g. mvn -Dtest.skip.mem=false test.

Implementation Note. The Maven property naming pattern "test.skip.x=boolean" is needlessly verbose, a cardinal sin for command line options. A more concise alternative would be "test.x" with the boolean sense negated. However, this complicates the pom.xml configuration for the Surefire plugin since it precludes direct use of the Surefire plugin's <skip> configuration tag, as in <skip>${test.skip.perf}</skip>. There doesn't seem to be a straightforward way to negate a boolean or otherwise make this easy, at least without resorting to profiles or a custom plugin, though I might be missing something. Also, the mold is arguably already set by Surefire's "maven.test.skip" property, though that has slightly different interpretation semantics than the properties above.

Marking tests as flaky

If a test should be marked as flaky add following annotation to the test and open an issue.

@FlakyTest
public void testFlakyFailsSometimes(){}

Marking tests to require certain Features from StoreManager

A test can be annotated that a test is only execute, if the StoreManager support this feature.

@FeatureFlag(feature = JanusGraphFeature.UnorderedScan)
public void testRequiresUnorderedScanOnDatabase(){}
Feature flag Required feature
UnorderedScan StoreFeatures.hasUnorderedScan()
OrderedScan StoreFeatures.hasOrderedScan()
CellTtl StoreFeatures.hasCellTtl()

Running a Single Test via Maven

The standard maven-surefire-plugin option applies for most tests:

mvn test -Dtest=full.or.partial.classname#methodname

However, MEMORY_TESTS and PERFORMANCE_TESTS are disabled by default regardless of whatever -Dtest=... option might be specified. When running a single MemoryTest or PerformanceTest, specify -Dtest.mem=true or -Dtest.perf=true as appropriate for the test in question.

Here's a concrete example.

# Executes no tests because the MEMORY_TESTS category is disabled by default
mvn test -Dtest=BerkeleyJEGraphPerformanceMemoryTest
# Executes the specified test
mvn test -Dtest=BerkeleyJEGraphPerformanceMemoryTest -Dtest.skip.mem=false

Running Tests with an External Solr

Solr tests can be run against an external Solr instance. For convenience the docker Maven profile is provided to manage a Solr Docker container through the Maven Failsafe Plugin. The default test version will be the same as the Solr client version.

mvn clean install -pl janusgraph-solr -Pdocker

Additional Maven profiles are defined for testing against default versions of other supported major Solr releases. (Currently, only Solr 7 is supported.)

mvn clean install -pl janusgraph-solr -Pdocker,solr7

Finally the solr.test.version property can be used to test against arbitrary Solr versions.

mvn clean install -pl janusgraph-solr -Pdocker -Dsolr.test.version=7.0.0

Running Elasticsearch Tests

Note Running Elasticsearch tests require Docker.

Elasticsearch tests run against an external Elasticsearch instance. The default test version will be the same as the Elasticsearch client version.

mvn clean install -pl janusgraph-es

Additional Maven profiles are defined for testing against default versions of other supported major Elasticsearch releases.

mvn clean install -pl janusgraph-es -Pelasticsearch5

Finally the elasticsearch.docker.version property can be used to test against arbitrary Elasticsearch versions >= 5.0.0. This is more complicated however because of differences across major versions in required server settings and Docker image names. The examples below illustrate the differences based on the Elasticsearch major version.

mvn clean install -pl janusgraph-es -Delasticsearch.docker.version=5.3.2
mvn clean install -pl janusgraph-es -Delasticsearch.docker.image=elasticsearch
mvn clean install -pl janusgraph-es -Delasticsearch.docker.version=6.0.0 -Delasticsearch.docker.image=elasticsearch

Running CQL Tests

Note Running CQL tests require Docker.

CQL tests are executed using testcontainers-java. CQL tests can be executed against a Cassandra 3 using the profile cassandra3, or a Scylla 3 using the profile scylladb.

mvn clean install -pl janusgraph-cql -Pcassandra3-murmur
mvn clean install -pl janusgraph-cql -Pscylladb

Special versions of Cassandra

System properties to configure CQL test executions:

Property Description Default value
cassandra.docker.image Docker image to pull and run. cassandra
cassandra.docker.version Docker image tag to pull and run 3.11.4
cassandra.docker.partitioner Set the cassandra partitioner. Supported partitioner are murmur, or byteordered murmur
cassandra.docker.useSSL Activate SSL Note: This property currently only works with the partitioner set to murmur. false
cassandra.docker.useDefaultConfigFromImage If set to false default configs of the image are used. Note: cassandra.docker.partitioner and cassandra.docker.useSSL are ignored. false

The following examples show possible configuration combinations.

mvn clean install -pl janusgraph-cql -Dcassandra.docker.version=2.2.14
mvn clean install -pl janusgraph-cql -Dcassandra.docker.image=cassandra
mvn clean install -pl janusgraph-cql -Dcassandra.docker.image=cassandra -Dcassandra.docker.version=3.11.2

TinkerPop tests

The CQL backend is tested with TinkerPop tests using following command.

Note: Profiles are not supported during running TinkerPop tests. If you do not want to use the default config, you can set cassandra.docker.image, cassandra.docker.version, or cassandra.docker.partitioner.

mvn clean install -Dtest.skip.tp=false -DskipTests=true -pl janusgraph-cql \
  -Dcassandra.docker.partitioner=murmur -Dcassandra.docker.version=2.2.14

Create new configuration files for new Versions of Cassandra

The file janusgraph-cql/src/test/resources/docker/docker-compose.yml can be used to generate new configuration files. Therefore, you have to start a Cassandra instance using docker-compose up. Afterward, you can extract the configuration which is located in the following file /etc/cassandra/cassandra.yaml.