TestEvo-Bench / teb-generation

A benchmark for test-case generation in evolving Java codebases. Each row captures a single (project, revision-pair) where new tests were authored to exercise newly-added or changed production code, and surfaces both the test code and the surrounding production context needed to predict it.

Links

• 🌐 Project website: https://www.testevo-bench.com/
• 📦 Code repository: https://anonymous.4open.science/r/testevo-bench-1150
• 🤝 Sibling dataset: TestEvo-Bench/teb-update — for test-update (modifying existing tests instead of generating new ones)

Dataset summary

teb-generation is a benchmark for generating new test methods that exercise newly-introduced or changed production code. Every example was mined from a real commit (rev1 → rev2) on a public Java project, and the new test is one that depends on the production-code change to behave correctly: it cannot be written or satisfied by reading only the pre-change codebase.

Each row corresponds to a single (project, rev1 → rev2) pair. Inside the row, test_changes is a list of one or more individual test methods authored in that commit, each paired with its focal production method, the production-side before/after, candidate dependency methods, and the dependencies that changed in the same commit.

Tasks (rows)	746
Test methods	1,961
Source projects	84 distinct Java repositories on GitHub
Java versions	8, 11, 17, 21
Build system	Maven
Total size	~8 MB

A task is one (project, rev1 → rev2) pair — the unit a model is asked to operate on. A test method is one entry inside that task's test_changes list — a single @Test method that was added or modified at rev2. One task may contain several related test methods written together; benchmarks can be reported at either granularity.

Schema

Each row has the following top-level fields:

Field	Type	Description
task_id	string	Stable identifier: <project>__<rev1_short>_<rev2_short>__<test_class>_<hash>
project_name	string	e.g. Javen205_IJPay-v2.8.4
git_clone_url	string	Upstream GitHub clone URL
rev1	string	Git SHA before the change (full 40-char)
rev2	string	Git SHA after the change
rev1_date	string	ISO 8601 (e.g. 2019-12-08T06:45:32Z)
rev2_date	string	ISO 8601
git_diff_url	string	GitHub compare URL between rev1 and rev2
test_file	string	Path of the test file within the repo
test_changes	list<struct>	One element per individual test method that was added/changed; see below
version	string	Upstream tag or branch (e.g. v2.8.4, master)
java_version	int	Java major version (8, 11, 17, or 21)

Each test_changes[] element contains:

Field	Type	Description
change_id	string	Unique id within the dataset
test_sign	string	JVM-style test method signature
class, method, module	string	Test class, method name, Maven module
junit_selector	string	JUnit selector usable by mvn test -Dtest=…
old_test_code	string | null	The test method's source at rev1 (null for newly-added tests)
new_test_code	string	The test method's source at rev2
old_test_lnum, new_test_lnum	list<string>	Line ranges of the test method at each rev
old_test_file_path	list<string>	Where the test file lived at rev1 (may be empty for new files)
old_production_code, new_production_code	string	Source of the focal production method at each rev
focal_file_path	string	Path of the focal production file
focal_method_sign	string	JVM-style signature of the focal production method
focal_all_deps_scored	list<struct>	All candidate dependency methods, each with a relevance score (nc, lcs_u, ed, class, tfidf signal sub-scores combined into score)
deps_changes	list<struct>	Production-code dependencies that changed between rev1 and rev2

Example row

{
  "task_id": "Javen205_IJPay-v2.8.4__ceafd24_996582e__WxPayKitTest_8649b344",
  "project_name": "Javen205_IJPay-v2.8.4",
  "git_clone_url": "https://github.com/Javen205/IJPay.git",
  "rev1": "ceafd245bef465d703c7530111626de905893657",
  "rev2": "996582e5028204b7ba2938ccaf009a3715ed204b",
  "rev1_date": "2019-12-08T06:45:32Z",
  "rev2_date": "2019-12-08T07:49:34Z",
  "git_diff_url": "https://github.com/Javen205/IJPay/compare/ceafd24…...996582e…",
  "test_file": "IJPay-WxPay/src/test/java/com/ijpay/wxpay/WxPayKitTest.java",
  "test_changes": [ /* 1 or more entries — see Schema */ ],
  "version": "v2.8.4",
  "java_version": 11
}

How to load

from datasets import load_dataset

ds = load_dataset("TestEvo-Bench/teb-generation", split="train")
print(len(ds), ds.column_names)

# Iterate over individual test changes (the unit of evaluation)
for row in ds:
    for tc in row["test_changes"]:
        focal = tc["focal_method_sign"]
        new_test = tc["new_test_code"]
        ...

Source projects + attribution

The code snippets in old_test_code, new_test_code, old_production_code, and new_production_code are derived from public Java repositories on GitHub. Each row's git_clone_url and git_diff_url link back to the upstream project; the upstream repository's own license governs reuse of those code snippets. The dataset structure and metadata are released under CC-BY-4.0 — please cite the project (see below) when using this benchmark.

Intended uses

Evaluating LLMs and program-synthesis systems on the task of generating a new test method given (a) the production-code change, (b) the test file's prior context, and (c) candidate focal-method dependencies. The included focal_all_deps_scored signals support both retrieval-augmented and end-to-end setups.

License

• Dataset structure and metadata: CC-BY-4.0
• Embedded code snippets: governed by each upstream repository's own license. See git_clone_url per row.