behave-modern-html-report 1.0.0

The modern, beautiful, single-file HTML report formatter for Behave.

Behave Modern HTML Report

The modern, beautiful, single-file HTML report formatter for Behave. Dark mode, charts, instant search, attachments, zero external requests.

behave-modern-html-report is a drop-in formatter for Behave that produces a single, self-contained HTML file — everything (CSS, JS, fonts, icons, attachments) is embedded so the report works offline, on any machine, forever.

Features

• 🌓 Dark / Light / Auto themes, modern Material-3 inspired UI
• 📊 Interactive charts (status pie, duration histogram, slowest scenarios, tag pass rate, timeline) — pure vanilla JS, no Chart.js CDN
• 🏷️ Tag analytics page: per-tag counts, pass rate, duration, and a dedicated chart
• � Gherkin Rules support: scenarios under a Rule are grouped and tagged correctly (Behave 1.3.x)
• �🔍 Instant client-side search across features, scenarios, steps and tags
• 🎚️ Filter by status with one click
• 📁 Expandable features → scenarios → steps with rich metadata
• 🧯 Modern error viewer with copy-to-clipboard tracebacks
• 🖼️ Attachments: images (with lightbox), JSON, text, binaries
• 🚀 Copy-reproduce-command per scenario (behave features/example.feature:3)
• 📊 Inline step duration bars to spot slow steps at a glance
• ♿ Accessible: keyboard navigation, ARIA labels, reduced-motion support
• 📦 Single HTML file, works offline, no web server, no CDN
• 🧩 Clean architecture — formatter / collector / models / renderer separation, fully testable
• 🛠️ Extensible — custom CSS/JS, custom title/logo/company, JSON sidecar, future plugin system

Installation

pip install behave-modern-html-report

Quick start

In your project's behave.ini (or setup.cfg):

[behave.formatters]
modern = behave_modern_html_report.formatter:ModernHTMLFormatter

Then run:

behave -f modern -o report.html

Open report.html in any browser. Done.

Configuration

All options are read from behave's userdata:

[behave.userdata]
bmr.title         = My Awesome Suite
bmr.company       = Acme Inc.
bmr.logo          = https://example.com/logo.svg
bmr.theme         = auto          ; auto | dark | light
bmr.json_sidecar  = true          ; writes report.json next to report.html
bmr.custom_css    = path/to/extra.css
bmr.custom_js     = path/to/extra.js

Behave 1.3.x and Gherkin Rules compatibility

behave-modern-html-report is tested against Behave 1.3.x and fully supports the Gherkin Rule keyword.

• Scenarios under a Rule keep their parent rule name and inherit their Rule tags correctly.
• Extended final statuses (error, hook_error, cleanup_error, xfailed, xpassed, pending_warn) are normalised and displayed in the UI.
• Error-like statuses are grouped as failures for feature status and tag analytics.

Feature: Checkout

  Rule: Payment required
    @payment
    Scenario: Card payment succeeds
      Given the user has items in cart
      When they pay with a valid card
      Then the order is confirmed

Attachments from your environment.py

Use the public helper API — no need to reach into the formatter:

from behave_modern_html_report import attach_screenshot, attach_text, log

def after_step(context, step):
    if step.status == "failed":
        attach_screenshot(context, context.browser, name="failure.png")
        attach_text(context, str(step.exception), name="error.txt")
        log(f"URL at failure: {context.browser.current_url}")

The helpers also work with Playwright, Selenium, PIL images, bytes, files, and JSON data.

Generate a demo without running Behave

python examples/generate_demo.py

This builds examples/demo-report.html with a realistic-looking suite — useful for previews, screenshots, and design iteration.

Architecture

behave events
    │
    ▼
 formatter.py ── thin adapter
    │
    ▼
 collector.py ── builds the model tree
    │
    ▼
   models.py  ── pure dataclasses
                (Execution → Feature → Rule-aware Scenario → Step)
    │
    ▼
 statistics.py ── aggregates counters, durations, buckets
    │
    ▼
 renderer.py  + templates/ + assets/  ── Jinja2 → single HTML file

The renderer is independent of Behave, so any tool that can produce an Execution object (e.g. a JSON loader) can use it.

Development

pip install -e ".[dev]"
pytest
ruff check .

License

MIT © Mathias Paulenko