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    pragmatic testing

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    Enforce pragmatic testing by only adding coverage that earns its maintenance cost and prevents suite bloat.

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    pragmatic testing

    pragmatic testing

    Example session with this skill installed

    I'm fixing a bug in the calculate_tax function where it fails for zero-dollar orders. Should I add a test? Check the repo first.

    • Read your context and instructions
    • Compiled the pragmatic testing

    I have analyzed the bug fix for calculate_tax and inspected the existing test suites.

    Existing coverage in tests/unit/test_billing.py already includes a parameterized test test_order_totals which covers various tax brackets but skips the zero-dollar edge case. Adding a specific regression test is justified here because a failure in tax calculation has high business consequence (incorrect invoicing) and the current coverage has a clear gap.

    Proposed Test Extension

    Instead of creating a new file, I will add the zero-dollar case to the existing parameterized suite.

    
# Updated case in tests/unit/test_billing.py

@pytest.mark.parametrize("subtotal, expected_tax", [
    (100.00, 10.00),
    (50.00, 5.00),
    (0.00, 0.00),  # Added: Regression case for zero-dollar orders
])
def test_order_totals(subtotal, expected_tax):
    assert calculate_tax(subtotal) == expected_tax

    Next steps

    1. Run pytest tests/unit/test_billing.py to verify the fix and the new case.
    2. Verify that the Order model handles the zero-dollar return without throwing a division error.
    3. Merge the fix with the extended assertion.

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    About this skill

    Writing tests for every line of code is a maintenance trap that slows down development. This skill enforces a pragmatic, skeptical approach to automated testing, ensuring you only add coverage when it provides clear business value. It prevents the creation of low-value tests for CSS, layout, or simple implementation details, focusing instead on high-risk areas like business rules and integration contracts.

    What it does

    • Utility Analysis determines if a test earns its maintenance cost based on contract protection and failure consequences.
    • Coverage Inspection searches existing suites and fixtures to prevent redundant test creation.
    • Suite Extension prioritizes adding cases to existing parameterized tests or assertions over creating new files.
    • Verification Strategy uses type checks, linting, and manual runtime verification for low-risk changes instead of permanent scripts.
    • Risk Targeting focuses coverage on state transitions, permissions, and shared behaviors that disrupt workflows.

    How it works

    1. Analyze the proposed code change to identify the specific behavior or contract being modified.
    2. Search the repository for existing tests, datasets, and fixtures related to that behavior.
    3. Justify the need for a new test by naming a concrete failure risk and explaining why current coverage is insufficient.
    4. Implement the smallest possible change, such as extending an existing assertion or adding a row to a parameterized test.

    Frameworks & tools

    Works with any testing stack including Jest, Pytest, Vitest, Cypress, Playwright, JUnit, and RSpec. It is framework-agnostic and adapts to the specific assertion styles and runner configurations found in your repository.

    Why this beats prompting it yourself

    Most LLMs default to "test everything" or follow TDD blindly, resulting in brittle snapshot tests and redundant suites. This skill applies professional skepticism to minimize your testing debt while ensuring critical paths remain protected.

    Use cases

    • Deciding whether a bug fix requires a regression test or just a manual check.
    • Refactoring components without creating a trail of fragile implementation tests.
    • Adding business logic to an existing service by extending current test suites.
    • Evaluating if a UI change needs a test based on logic complexity vs visual style.

    Known limitations

    Does not perform infrastructure-level rewrites or delete existing tests. Requires repository access to perform the mandatory inspection of existing suites.

    How to use

    Skills on Agensi run inside your AI agent. Copy the prompt, paste it into your agent, and it connects to Agensi and installs this skill for you. If a payment is needed, your agent shows it to you first.

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    Requires

    Node.js

    Listed2 days ago

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