testing-python-pytest

A tool for generating Python unit tests with pytest, a popular Python testing framework, by inspecting a source module and covering its functions, classes, methods, and code paths.

In plain words
What is it for?
Use it to analyze Python modules, create test files, measure coverage, and fill gaps until each file reaches the stated coverage target.
Why use it?
It helps reveal untested branches and organize tests with fixtures, parameterized cases, mocks, and the arrange-act-assert pattern.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/jenreh/appkit-bpmn-server/testing-python-pytest
Any agent
npx skills add jenreh/appkit-bpmn-server --skill testing-python-pytest
Clone the repo
git clone --depth 1 https://github.com/jenreh/appkit-bpmn-server

Made for: Claude Code, Codex.

Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,470 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00124 $0.01470
Opus 5 $0.00062 $0.00735
Sonnet 5 $0.00025 $0.00294
Haiku 4.5 $0.00012 $0.00147

Measured yesterday against content hash df276cfafff3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

testing-python-pytest scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/analyze_module.py, scripts/run_coverage.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.github/skills/testing-python-pytest/SKILL.md · 191 lines

How it starts

The opening of the file, as written. The whole thing — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Python pytest Test Suite Generator

Generates comprehensive, production-quality pytest unit test suites that achieve >90% line and branch coverage per file.

Quick start

pip install pytest pytest-cov pytest-mock          # Einmalig installieren

python scripts/analyze_module.py src/my_module.py  # Modul analysieren
# → Schreibe tests/test_my_module.py  (siehe Workflow unten)
python scripts/run_coverage.py src/my_module.py tests/test_my_module.py

Workflow

Kopiere diese Checkliste und hake ab:

Testing Progress:
- [ ] Step 1: Modul analysieren          → analyze_module.py
- [ ] Step 2: Testdatei schreiben        → AAA, Fixtures, Parametrize, Mocks
- [ ] Step 3: Coverage messen            → run_coverage.py
- [ ] Step 4: Lücken schließen           → Fehlende Zweige gezielt testen
- [ ] Step 5: ≥90 % bestätigt            → Fertig ✓

Step 1 — Modul analysieren

python scripts/analyze_module.py <pfad/zum/modul.py>

Das Script gibt JSON aus mit: Klassen, Methoden, Funktionen, Typ-Hinweisen, Exception-Pfaden, Async-Code und konkreten Testing-Hints.

Step 2 — Testdatei schreiben

Dateiname: tests/test_<modulname>.py Lese references/PYTEST_PATTERNS.md für Fixtures, Parametrize, Mocking und Async-Tests.

Struktur jeder Testfunktion — AAA-Pflicht:

def test_<methode>_<szenario>(self, fixture):
    # Arrange  — Vorbedingungen und Eingaben
    input_val = ...
    # Act      — Aktion unter Test
    result = unit_under_test(input_val)
    # Assert   — Erwartetes Ergebnis prüfen
    assert result == expected

Mindestabdeckung pro Einheit:

Szenario Pflicht
Happy path (Normalfall)
Grenzwerte (0, -1, leer, None)
Exception-Pfade (pytest.raises) ✓ je raise im Code
Alle Bedingungszweige (if/else)
Externe Abhängigkeiten gemockt

Step 3 & 4 — Coverage messen und Lücken schließen

python scripts/run_coverage.py <modul_pfad> <testdatei_pfad>

Read the full file on GitHub · 191 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 191 lines · 124 tokens per session scan A df276cfafff3

Subscribe to this mod's changes

testing-python-pytest is a skill published in the GitHub repository jenreh/appkit-bpmn-server (0 stars, last pushed 2mo ago), licensed MIT. It adds 124 tokens to every session and 1,470 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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