Source: https://seerepo.com/best-tested/flask
Markdown source: https://seerepo.com/best-tested/flask.md
Description: 12 public Flask repos that SeeRepo read have 10 test files or more. mitmproxy/mitmproxy comes first: a test imports 68.5% of its code files.

# The best-tested open source Flask repos

12 public Flask repos that SeeRepo read have 10 test files or more. mitmproxy/mitmproxy comes first: a test imports 68.5% of its code files.

How they're ranked: by the share of their code files that some test imports directly, then by stars. That says which files a test reaches, not which lines run. A repo enters with 10 test files or more and 20 code files or more.

Updated November 2, 2026.

## The repos, ranked

1. [mitmproxy/mitmproxy](https://seerepo.com/r/mitmproxy/mitmproxy): 68.5% of its code files have a test that imports them · 349 test files · Python · 46,494 stars — An interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.
2. [langgenius/dify](https://seerepo.com/r/langgenius/dify): 65.5% of its code files have a test that imports them · 4,495 test files · Python · 159,891 stars — Build Agentic workflows, RAG pipelines, with rich AI model and tool support on one collaborative workspace. Deploy on cloud, VPC, or self-hosted, so teams move from prototype to production without rebuilding the stack.
3. [apache/superset](https://seerepo.com/r/apache/superset): 61.6% of its code files have a test that imports them · 3,014 test files · Python · 75,363 stars — Apache Superset is a Data Visualization and Data Exploration Platform
4. [apache/airflow](https://seerepo.com/r/apache/airflow): 52.9% of its code files have a test that imports them · 4,898 test files · Python · 47,329 stars — Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
5. [666ghj/MiroFish](https://seerepo.com/r/666ghj/MiroFish): 37.9% of its code files have a test that imports them · 21 test files · Python · 82,694 stars — A Simple and Universal Swarm Intelligence Engine, Predicting Anything. 简洁通用的群体智能引擎，预测万物
6. [trycua/cua](https://seerepo.com/r/trycua/cua): 26.8% of its code files have a test that imports them · 1,988 test files · Rust · 31,513 stars — Scale computer-use 2.0 with open-source drivers, cross-OS sandboxes, and benchmarks for training, evaluation, and data generation.
7. [BerriAI/litellm](https://seerepo.com/r/BerriAI/litellm): 21.7% of its code files have a test that imports them · 6,741 test files · Python · 62,405 stars — The fastest, litest AI Gateway. Rust core with Python SDK. Call 100+ LLM APIs in OpenAI (or native) format with cost tracking, guardrails, load balancing, and logging [Bedrock, Azure, OpenAI, Anthropic, OpenAI, VertexAI, vLLM, Nvidia NIM]
8. [hasura/graphql-engine](https://seerepo.com/r/hasura/graphql-engine): 18.3% of its code files have a test that imports them · 659 test files · TypeScript · 32,127 stars — Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.
9. [xtekky/gpt4free](https://seerepo.com/r/xtekky/gpt4free): 18% of its code files have a test that imports them · 54 test files · Python · 66,956 stars — The official gpt4free repository | various collection of powerful language models | opus 4.6 gpt 5.3 kimi 2.5 deepseek v3.2 gemini 3
10. [666ghj/BettaFish](https://seerepo.com/r/666ghj/BettaFish): 11.5% of its code files have a test that imports them · 15 test files · Python · 42,555 stars — 微舆：人人可用的多Agent舆情分析助手，打破信息茧房，还原舆情原貌，预测未来走向，辅助决策！从0实现，不依赖任何框架。
11. [ankitects/anki](https://seerepo.com/r/ankitects/anki): 8.4% of its code files have a test that imports them · 73 test files · Rust · 32,458 stars — Anki is a smart spaced repetition flashcard program
12. [geekcomputers/Python](https://seerepo.com/r/geekcomputers/Python): 0.4% of its code files have a test that imports them · 14 test files · Python · 35,461 stars — My Python Examples

## Frequently asked questions

### Which Flask repo has the most test files?

BerriAI/litellm, with 6,741 test files.

The proof: [BerriAI/litellm's card](https://seerepo.com/r/BerriAI/litellm)

### What share of their code files do Flask repos test?

The median of the 12 is 24.3%: half are above it and half below.

### What languages are the best-tested Flask repos written in?

Python (9), Rust (2), and TypeScript (1).

### How many of the best-tested Flask repos have commits signed by AI?

9 of the 12; the most, trycua/cua, with 27.8% of its commits.

The proof: [the commits each tool signed in trycua/cua](https://seerepo.com/r/trycua/cua/ai)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.