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Quidem UT

Enables to write sql level tests easily. Can be used to write tests against existing test backends (ComponentSupplier) - by doing so the testcases can be moved closer to the exercised codes.

These tests might come from real usages of Druid by some external tool - by utilizing the capture mode of this module iq tests could be captured and validated later that they retain their results. By adding tests for those here could act as an early warning that something might have changed.

Usage

Install java&maven (if needed)

If you don't have java&maven - one way to set that up is by using sdkman like this:

# install sdkman
curl -s "https://get.sdkman.io" | bash
# at the end of installation either open a new terminal; or follow the instructions at the end

# install java&maven
sdk install java 11.0.23-zulu
sdk install maven

# run mvn to see if it works
mvn --version

# download druid sources
git clone https://github.com/apache/druid

Running these tests

CI execution happens by a standard JUnit test QTest in this module
the dev/quidem script can be used to run these tests (after the project is built)

Launching a test generating broker

make sure to build the project first; one way to do that is:

mvn install -pl quidem-ut/ -am -DskipTests -Pskip-static-checks

launch the broker instance with:
```
mvn exec:exec -pl quidem-ut -Dquidem.record.autostart=true
```
- the broker will be running at http://localhost:12345
- the used test configuration backend can configured by supplying quidem.uri
```
mvn exec:exec -pl quidem-ut -Dquidem.uri=druidtest:///?componentSupplier=ThetaSketchComponentSupplier
```
- new record files can be started by calling http://localhost:12345/quidem/start
  - if quidem.record.autostart is omitted recording will not start
after finished with the usage of the broker ; a new record-123.iq file will be in the project's worktree - it will contain all the executed statements
- running dev/quidem -Dquidem.overwrite updates the resultsets of all iq files around there
- rename the testfile to have a more descriptive name

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