78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
# Junit 5 tag usage
|
|
|
|
## Status
|
|
Proposed
|
|
|
|
Proposed by: Adam Gibson (21-03-2021)
|
|
|
|
Discussed with: N/A
|
|
|
|
## Context
|
|
DL4J was a junit 4 based code based for testing.
|
|
It's now based on junit 5's jupiter API, which has support for [Tags](https://junit.org/junit5/docs/5.0.1/api/org/junit/jupiter/api/Tag.html).
|
|
|
|
DL4j's code base has a number of different kinds of tests that fall in to several categories:
|
|
1. Long and flaky involving distributed systems (spark, parameter-server)
|
|
2. Code that requires large downloads, but runs quickly
|
|
3. Quick tests that test basic functionality
|
|
4. Comprehensive integration tests that test several parts of a code base
|
|
|
|
Due to the variety of behaviors across different tests, it's hard to tell what's actually needed
|
|
for running and validating whether changes work against such a complex test base.
|
|
|
|
Much of the time, most of the tests aren't related to a given change.
|
|
Often times, quick sanity checks are all that's needed in order to make sure a change works.
|
|
|
|
A common set of tags is used to filter which tests are needed to run when.
|
|
This allows us to retain complex integration tests and run them on a set schedule
|
|
to catch regressions while allowing a defined subset of tests to run for a quick feedback loop.
|
|
|
|
|
|
|
|
|
|
## Decision
|
|
|
|
A few kinds of tags exist:
|
|
1. Time based: long-time,short-time
|
|
2. Network based: has-download
|
|
3. Distributed systems: spark, multi-threaded
|
|
4. Functional cross-cutting concerns: multi module tests, similar functionality (excludes time based)
|
|
5. Platform specific tests that can vary on different hardware: cpu, gpu
|
|
6. JVM crash: (jvm-crash) Tests with native code can crash the JVM for tests. It's useful to be able to turn those off when debugging.: jvm-crash
|
|
7. RNG: (rng) for RNG related tests
|
|
8. Samediff:(samediff) samediff related tests
|
|
9. Training related functionality
|
|
10. long-running-tests: The longer running tests that take a longer execution time
|
|
11. large-resources: tests requiring a large amount of ram/cpu (>= 2g up to 16g)
|
|
|
|
|
|
New maven properties for maven surefire:
|
|
test.offheap.size: tunes off heap size for javacpp
|
|
test.heap.size: tunes heap size of test jvms
|
|
|
|
|
|
Auto tuning the number of CPU cores for tests relative to the number of CPUs present
|
|
|
|
|
|
|
|
## Consequences
|
|
### Advantages
|
|
* Ability to sort through and filter tests based on different running environments
|
|
|
|
* Ability to reason about test suites as a whole dynamically across modules
|
|
|
|
* Avoid the need to define test suites
|
|
|
|
* Ability to define groups of tags based in profiles
|
|
|
|
* Ability to dynamically filter tests from the maven command line
|
|
|
|
|
|
### Disadvantages
|
|
|
|
* Documentation and maintenance burden needing to know what tags do what
|
|
|
|
* Test maintenance for newcomers who may not know how to tag tests
|
|
|
|
|