Testing Guide

Use pnpm for repository scripts. The package declares Node.js >=24.

Standard Validation

For source changes, run:

pnpm run build
pnpm run typecheck
pnpm run test:unit

For documentation-only changes, no automated test is required unless the docs change package, build, or testing claims.

Regression Suite Layout

Regression tests live in test/regression/ and are organized by behavior, not by historical bug number. File names should describe the contract being tested, such as object-identity.test.js, content-type-defaults.test.js, or slide-master-placeholders.test.js.

Each regression file calls defineRegressionSuite() from test/helpers.js. The optional second argument records legacy provenance, for example legacy bug-21, so old issue references remain traceable without making the suite name opaque.

Prefer public API deck generation plus focused package/XML assertions:

• Use build() to create a presentation and inspect the generated package.
• Use readEntry() for specific package parts such as ppt/slides/slide1.xml.
• Use helper assertions such as assertContentTypeDefault(), assertContentTypeOverride(), assertXmlOrder(), and assertNonVisualDrawingProperty() when they match the behavior under test.
• Keep raw XML substring or regex assertions local and narrowly targeted when a helper would hide the OOXML detail being tested.

Add a regression test when a public API call must keep producing a specific package part, relationship, OOXML element, attribute, or absence of generated parts. Name the file after the behavior, and include bug or upstream issue context in the suite metadata or test name only when it helps future triage.

OOXML Schema Validation

Install the validator once:

./tools/ooxml-validator/install.sh

Run schema fixtures:

pnpm run test:schema

Use this path for emitted OOXML changes. Add or update focused fixtures in test/schema.test.js.

Read/Round-Trip Suite (pptxgenjs/read)

The lossless read/edit subsystem (src/read/) has its own harness:

pnpm run test:read

It runs test/read/roundtrip.test.js against real, PowerPoint-authored decks in test/read/fixtures/ (provenance in that directory's README): part-set stability, per-part byte-identity for untouched parts, lazy-parse guarantees, save idempotence, content-type/relationship resolution, the dirty (mutate-and-reserialize) path, and schema validation of saved output. The schema cases require the OOXML validator above and are skipped with a notice when it is not installed.

Changes under src/read/ should run this suite; new read/edit capabilities should extend it (and grow the fixture set) alongside the code.

pptx-bank/ — real-world deck corpus (uncommitted)

pptx-bank/ at the repo root is an uncommitted bank of real-world PowerPoint files for ad-hoc testing and verification: probing OOXML structures, reproducing read/round-trip behaviour against decks far messier and larger than the curated fixtures, and finding candidates worth promoting to a committed fixture. It is gitignored (/pptx-bank/* with a !README.md negation), so you can drop in arbitrary decks — including large, copyrighted, or client files — with no risk of them entering Git history. See pptx-bank/README.md.

How it relates to the other deck locations:

Location	Committed?	Role
test/read/fixtures/	yes — hash-pinned, provenance-tracked, license-clean	curated, minimal inputs the harness depends on (CI runs these)
.tmp/	no	generated output scratch (e.g. pnpm run test:read:emit)
pptx-bank/	no	free-form input corpus for exploration and manual verification

The automated harness must only point at test/read/fixtures/ — bank files are not tracked, so other checkouts and CI will not have them. When a bank deck proves a good minimal, license-clean regression case, promote it: copy it into test/read/fixtures/, add it to that directory's provenance table + SHA-256 list and purpose notes, and wire it into the harness (FIXTURES in test/read/roundtrip.test.js). The mixed.pptx fixture was promoted from the bank this way to cover connectors, nested groups, charts, and SmartArt that the vendored fixtures lacked.

Full Test Command

The default test command builds first, then runs regression and schema validation:

pnpm test

Package Boundary Checks

Build package artifacts:

pnpm run build

Check the packed package:

pnpm run package:lint
pnpm run pack:check
pnpm run test:package

package:lint runs package export/type validation. pack:check uses pnpm pack --dry-run. test:package creates a packed package with pnpm, installs it with npm and pnpm, verifies that the ESM entries and declarations are present, verifies that old generated artifacts are absent, runs an ESM import smoke test, checks that the package has no CJS export condition, and typechecks a minimal TypeScript consumer.

Demo Smoke Tests

Run both maintained demo smoke tests:

pnpm run test:demos

Run one target:

pnpm run test:demo:node
pnpm run test:demo:vite

The demo smoke command builds package artifacts first, then runs the maintained workspace demos with pnpm. The Node demo validates ESM package usage in a Node application. The Vite demo validates a modern browser app path through React, TypeScript, and Vite.

Manual Visual Checks

Automated tests prove package shape and generated XML structure. Manual visual checks are still useful for user-visible PowerPoint behavior:

1. Generate a small deck from the Node demo or Vite demo.
2. Open it in Microsoft PowerPoint when available.
3. Check import behavior in Keynote, LibreOffice Impress, or Google Slides when the change affects cross-app compatibility.
4. For browser download behavior, prefer demos/vite-demo.

Node demo decks are written to demos/node/output/, which is ignored by git. Re-running a demo command replaces the previous deck with the same name.