TestSpark
By JetBrains Research. Category: Unit test generation. Homepage
The JetBrains Research README describes TestSpark as an experimental IntelliJ IDEA plugin that generates unit tests for Java and Kotlin code. It offers three strategies: LLM-based generation through OpenAI, HuggingFace, Google AI or the JetBrains AI Assistant platform with a user-supplied token, search-based generation with EvoSuite, and symbolic execution with Kex. The plugin runs locally in the IDE and produces JUnit tests. It was first built by CISELab at TU Delft and is now maintained by the JetBrains Research Software Testing Research team. The code is MIT-licensed, and the JetBrains Marketplace lists the plugin as free.
Description written from the vendor's documentation.
Status
Status: Active
Facts
| Fact | Value | Evidence | Source | Verified on |
|---|---|---|---|---|
| Status | Active | Documented | plugins.jetbrains.com | |
| AI capabilities | Documented | github.com | ||
| Test creation | Documented | github.com | ||
| Test output | Not documented | Not documented | None found | |
| Surfaces | Not documented | Not documented | None found | |
| Hosting | Documented | github.com | ||
| Pricing model | Documented | plugins.jetbrains.com | ||
| Free tier | Yes | Documented | plugins.jetbrains.com | |
| CI integrations | Not documented | Not documented | None found | |
| Self-healing | None documented | Not documented | None found | |
| Agent integration | Not documented | Not documented | None found | |
| Open source | Yes, licence MIT | Documented | github.com |
Published prices
No prices are published.
Vendor-stated, verbatim
What JetBrains Research says about its product, quoted as published and not confirmed in documentation.
“TestSpark uses EvoSuite, which is the most powerful search-based local test generator available for Java.”
“Powered by SMT solvers, it supports really high coverages given larger time frames.”
Alternatives
Tools in the same category (Unit test generation), ordered by the number of shared creation and surface values, then by name. Each line lists documented facts that differ from TestSpark.
- ChatUniTest: Unit test generation; no documented difference in output, creation, hosting or free tier
- CodeRabbit: documents hosting cloud
- CoverUp: Unit test generation; no documented difference in output, creation, hosting or free tier
- Diffblue Cover: Unit test generation; no documented difference in output, creation, hosting or free tier
- EarlyAI: documents status shut down
- GitAuto: documents hosting cloud
Questions
Is this page a review of TestSpark?
No. This page is a fact sheet. Each fact shows its evidence level, its source and the date it was checked. We do not rate or rank tools.
Does TestSpark have a free tier?
Yes. TestSpark has a free tier. This is documented, checked on 2026-09-24.
What test output does TestSpark produce?
The test output format is not documented as of 2026-09-24.
Is TestSpark still available?
Status: Active, checked on 2026-09-24.
Sources
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