07.07 — HumanizedDriver

07.07 — HumanizedDriver#

Source file: src/lib/ext/selenium/humanize/proxy.py

Proxy pattern: wraps a Selenium WebDriver and intercepts only find_element* to return WebElements whose send_keys are humanized (slow typing with typos, hesitations, corrections).

Code#

class HumanizedDriver(WebDriver):
    def __init__(self, driver: WebDriver, **keyboard_config: Unpack[KeyboardConfig]) -> None:
        object.__init__(self)
        self._driver = driver
        self._config = keyboard_config

    def find_element(self, by: str | RelativeBy = "id", value: str | None = None) -> _HumanizedWebElement:
        element = self._driver.find_element(by, value)
        return _HumanizedWebElement(element, self._config)

    def find_elements(self, by: str | RelativeBy = "id", value: str | None = None) -> list[WebElement]:
        elements = self._driver.find_elements(by, value)
        return [_HumanizedWebElement(el, self._config) for el in elements]

    def __getattr__(self, name: str):
        return getattr(self._driver, name)

1. Inherits from WebDriver#

class HumanizedDriver(WebDriver):

HumanizedDriver passes isinstance(x, WebDriver) checks.

02.08 — POMBase

02.08 — POMBase#

Source file: src/ocarina/pom/base.py

Framework-agnostic abstract base for the Page Object Model. Two required methods. Zero mention of Selenium.

Code#

class POMBase(ABC):
    @abstractmethod
    def verify(self, *, timeout: float | None = None) -> Self:
        ...

    @abstractmethod
    def get_current_title(self) -> str:
        ...

Six bytes of contract (the two signatures). That’s all.

Why two methods#

verify(timeout=None) -> Self#

Purpose: prove we’re on the right page. Otherwise, raise.

  • timeout lets you wait up to a given time for the page to load (handy for Selenium WebDriverWait).
  • None default lets the implementation decide (typically reading get_timeout() which reads the CLI).
  • Returning Self enables fluent method chaining (MyPage(...).open().verify().click()).

The only method test-side that’s truly needed to guarantee “I’m on the page I want.” Everything else (click_xxx, enter_xxx) is on the subclass.

08.09 — CI: ai_proof_ci.yml + ai_proof_e2e.yml

08.09 — CI: ai_proof_ci.yml + ai_proof_e2e.yml#

Two workflows. Fast PR (lint+typecheck). Manual e2e with a Firefox/Chrome matrix + Heroku warm-up + ChromeDriver stacktrace filtering.

ai_proof_ci.yml#

name: ai_proof CI

on:
  push:
    branches: [main]
  pull_request:
  workflow_dispatch:

defaults:
  run:
    shell: bash

jobs:
  lint-and-typecheck:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.14"
          allow-prereleases: true
      - uses: actions/cache@v4
        with:
          path: .venv
          key: venv-${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('pyproject.toml') }}
      - name: Install dependencies
        if: steps.cache-venv.outputs.cache-hit != 'true'
        run: |
          python -m venv .venv
          .venv/bin/pip install . ruff mypy mypy-extensions typing-extensions pre-commit

      - name: Ruff format check
        run: .venv/bin/ruff format src/ --check

      - name: Ruff lint
        run: .venv/bin/ruff check src/

      - name: Mypy
        run: .venv/bin/mypy src/
StepCmd
Ruff format checkruff format src/ --check
Ruff lintruff check src/
Mypymypy src/

ai_proof_e2e.yml#

name: ai_proof e2e

on:
  workflow_dispatch:

defaults:
  run:
    shell: bash

jobs:
  e2e:
    name: e2e (${{ matrix.browser }})
    runs-on: ubuntu-latest
    env:
      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
      WAIT_TIMEOUT: 15
    strategy:
      fail-fast: false
      matrix:
        include:
          - browser: firefox
            driver: geckodriver
          - browser: chrome
            driver: chromedriver

    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.14"
          allow-prereleases: true
      - uses: actions/cache@v4
        with:
          path: .venv
          key: venv-${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('pyproject.toml') }}
      - name: Install dependencies
        if: steps.cache-venv.outputs.cache-hit != 'true'
        run: |
          python -m venv .venv
          .venv/bin/pip install . ruff mypy mypy-extensions typing-extensions pre-commit

      # --- Firefox ---

      - name: Install geckodriver
        if: matrix.browser == 'firefox'
        run: |
          GECKO_VERSION=0.36.0
          wget -q https://github.com/mozilla/geckodriver/releases/download/v$GECKO_VERSION/geckodriver-v$GECKO_VERSION-linux64.tar.gz
          tar -xzf geckodriver-v$GECKO_VERSION-linux64.tar.gz
          chmod +x geckodriver

      - name: Setup Firefox
        if: matrix.browser == 'firefox'
        uses: browser-actions/setup-firefox@fcf821c621167805dd63a29662bd7cb5676c81a8

      # --- Chrome ---

      - name: Install chromedriver
        if: matrix.browser == 'chrome'
        run: |
          CHROME_VER=$(google-chrome-stable --version | grep -oP '\d+\.\d+\.\d+\.\d+')
          wget -q -O chromedriver.zip \
            "https://storage.googleapis.com/chrome-for-testing-public/${CHROME_VER}/linux64/chromedriver-linux64.zip"
          unzip -q chromedriver.zip
          mv chromedriver-linux64/chromedriver ./chromedriver
          chmod +x ./chromedriver

      # --- Warm-up ---

      - name: Warm up Heroku dyno
        run: |
          # CURA runs on a Heroku dyno that sleeps after inactivity.
          # Tests hitting a cold dyno produce timeouts (false fails) and slow
          # confirmations (false passes on gap tests). Wake it explicitly
          # before any browser opens.
          curl -sf --retry 6 --retry-delay 5 --retry-all-errors \
            --max-time 30 https://katalon-demo-cura.herokuapp.com/ > /dev/null
          echo "Dyno is warm"

      # --- Run ---

      - name: Run e2e cycle
        run: |
          # ChromeDriver release builds ship without debug symbols. On errors it
          # dumps raw C++ stack frames ("#N 0x<addr> <unknown>") into the WebDriver
          # response, which Selenium surfaces as the exception message — polluting
          # both the live log and the pretty-print summary with unreadable hex noise.
          # No Python-side fix exists. Strip the frames with sed before they land.
          # pipefail preserves Python's exit code through the pipe.
          set -o pipefail
          .venv/bin/python -u src/main.py \
            --driver-path ./${{ matrix.driver }} \
            --browser ${{ matrix.browser }} \
            --workers 3 \
            --wait-timeout ${{ env.WAIT_TIMEOUT }} \
            --logger terminal+file \
            2>&1 | sed -u \
              -e '/Stacktrace:/{N;/\n#[0-9][0-9]* 0x[0-9a-f][0-9a-f]* <unknown>/{s/Stacktrace:\n[^\n]*/HIDDEN/;b};P;D}' \
              -e '/^#[0-9][0-9]* 0x[0-9a-f][0-9a-f]* <unknown>/d'

      - name: Enumerate traces
        if: always()
        run: |
          sync
          find $GITHUB_WORKSPACE/.screenshots -type f 2>/dev/null || true
          find $GITHUB_WORKSPACE/.ocarina_logs -type f 2>/dev/null || true
          find $GITHUB_WORKSPACE/.reports -type f 2>/dev/null || true

      - name: Upload screenshots
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: screenshots-${{ matrix.browser }}
          path: .screenshots/
          retention-days: 7

      # … upload logs, reports similarly ...

Analysis#

fail-fast: false#

strategy:
  fail-fast: false
  matrix:
    include:
      - browser: firefox
      - browser: chrome

fail-fast: false — if Firefox fails, Chrome continues. Essential: the point of the run is seeing both browsers, even when one fails.

Chapter 02.10 — Infrastructure

Chapter 02.10 — Infrastructure#

Everything that touches external resources: driver pool, builders, screenshotters, act counter, and the Selenium adapters that implement them. Since 1.1.3, a parallel infra/playwright/ ships the same contracts in Playwright flavor — same pool, same builder, same ports.

Plan#

#FileSubject
0101-drivers-pool.mdWebDriversPool[Driver]: Semaphore, Queue, warmup with watchdog, shutdown.
0202-driver-builder.mdDriverBuilder[Driver]: profile and tmp dirs handling.
0303-screenshotter.mdScreenshotter[TDriver] + ScreenshotterConfig: burst, healthcheck, threadsafe.
0404-act-counter.mdActCounter + ThreadsBasedActCounter (thread-local).
0505-selenium-adapters.mdcreate_driver (Firefox/Chrome/Edge/Safari), create_drivers_pool, create_screenshotter, driver_healthcheck, SeleniumTitleMixin.
0606-playwright-actor.mdThe PlaywrightDriver actor: owner thread, marshalling through submit, the call_timeout liveness ceiling, cross-thread warmup, observe-only Watcher.

BuiltWebDriver[Driver]#

type BuiltWebDriver[Driver] = tuple[Driver, Effect]

The exchange unit between the builder and the pool: a (driver, dispose) tuple. dispose is an Effect (no argument, no return) that knows how to clean up that exact driver (driver.quit() + removal of the tmp profile if needed).

02.12 — Custom types & custom errors

02.12 — Custom types & custom errors#

Ocarina’s shape layer. No logic — types, aliases, exceptions, protocols. What makes the DSL typed without adding runtime logic.

custom_types/#

FileContents
effect.pytype Effect = Callable[[], None] + type Effects = tuple[Effect, ...]
thunk.pytype Thunk[T] = Callable[[], T]
tpom.pyTypeVar TPOM bound POMBase
supports_write.pyProtocol SupportsWrite[T] (write(s: T) -> Any)
built_web_driver.pytype BuiltWebDriver[Driver] = tuple[Driver, Effect]
scenario.pyScenario[Driver] (frozen dataclass)
test_components.pyTestChain, TestSetup, TestTeardown, TestWatchers[Driver]
test_runner.pyTestRunner[Driver] (frozen dataclass)
oc_test.pyTestName, TestScenario[Driver], TestScenarioFragment[Driver]
oc_test_layers.pyTestId, TestResult, TestSuiteResult, TestSuiteResults, TestCampaignResults, TestCycleResults
selenium/built_web_driver.pyBuiltSeleniumWebDriver = BuiltWebDriver[WebDriver]
selenium/oc_test_scenario.pySeleniumTestScenario = TestScenario[WebDriver]
selenium/supported_browsers.pytype SupportedSeleniumBrowser = Literal["chrome", "firefox", "edge", "safari"]
selenium/web_drivers_pool.pytype SeleniumWebDriversPool = WebDriversPool[WebDriver]

All these files are excluded from coverage (pyproject.toml#tool.coverage):