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java-testing-lab/instancio/README.md
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instancio

Companion code for the ankurm.com post Instancio: Generate Realistic Test Data Automatically in Java (https://ankurm.com/instancio-java-generate-test-data/).

Component Version
instancio-junit / instancio-core 6.1.0 (GA; 6.0.0-RC1..RC4 exist on Maven Central but are release candidates)
JUnit Jupiter 6.1.3 (the version instancio-junit 6.1.0 itself is built against)
slf4j-simple 2.0.19, only in the optional seed-log profile
JDK 25 (Temurin 25.0.5+8)
./scripts/run-all.sh      # tests + failure captures; regenerates output/*.txt

Each test writes a transcript to output/ and asserts the same facts. Not stable between runs: 01, 03 (random sizes), 15 (random ages), and the seeds in 17 and 18.

Test Output Topic
BasicsTest 01-03 create, what the defaults look like, other entry points
CustomiseTest 04-08 set, generate, supply, ignore, withNullable, subtype, selectors, unused-selector error
SettingsAndSeedTest 09-11 Settings keys, same seed gives equal objects
GenericsAndSealedTest 12-14 sealed hierarchy, TypeToken, record compact constructor
JUnitExtensionTest 15 InstancioExtension, @WithSettings, @Given, @Seed, parameterized tests
FailingSeedDemoTest, ReproduceFailureDemoTest 16-18 fail on purpose (only with -Dlab.demo=...), seed summary, reproduction

@InstancioSource no longer exists in instancio-junit 6.x; the module uses @Given and @MethodSource instead.