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Re-enable full WASM marimo Playwright test suite #513
Description
Context
The WASM marimo Playwright tests were trimmed to a single smoke test to keep CI fast and reliable. The full test suite should be re-enabled once WASM test infrastructure is more stable.
Tests to re-enable
These tests were in packages/buckaroo-js-core/pw-tests/wasm-marimo.spec.ts and should be added back:
test('WASM notebook displays version info and data', async () => {
const pageText = await sharedPage.textContent('body');
expect(pageText).toBeTruthy();
const widgets = await sharedPage.locator('.buckaroo_anywidget').all();
expect(widgets.length).toBeGreaterThanOrEqual(1);
});
test('small DataFrame renders in WASM', async () => {
const firstWidget = sharedPage.locator('.buckaroo_anywidget').first();
const count = await getRowCount(firstWidget);
expect(count).toBeGreaterThan(0);
});
test('cell values are readable after WASM load', async () => {
const firstWidget = sharedPage.locator('.buckaroo_anywidget').first();
try {
const firstCellText = await getCellText(firstWidget, 'a', 0);
expect(firstCellText).toBeTruthy();
} catch (e) {
const cells = await firstWidget.locator('.ag-cell').all();
expect(cells.length).toBeGreaterThan(0);
}
});
test('column headers are visible in WASM', async () => {
const firstWidget = sharedPage.locator('.buckaroo_anywidget').first();
const headers = await firstWidget.locator('.ag-header-cell-text').all();
expect(headers.length).toBeGreaterThan(0);
});
test('summary stats grid renders in WASM', async () => {
const firstWidget = sharedPage.locator('.buckaroo_anywidget').first();
const statsCells = await firstWidget.locator('.ag-cell').all();
expect(statsCells.length).toBeGreaterThan(0);
});
test('second widget (if exists) also renders in WASM', async () => {
const widgets = await sharedPage.locator('.buckaroo_anywidget').all();
if (widgets.length >= 2) {
await widgets[1].waitFor({ state: 'visible', timeout: 30_000 });
const secondWidgetCells = await widgets[1].locator('.ag-cell').all();
expect(secondWidgetCells.length).toBeGreaterThan(0);
}
});
test('WASM notebook remains responsive after scroll', async () => {
const widgets = await sharedPage.locator('.buckaroo_anywidget').all();
if (widgets.length === 0) return;
const firstWidget = widgets[0];
const initialRowCount = await getRowCount(firstWidget);
if (initialRowCount < 10) return;
try {
const targetRow = Math.floor(initialRowCount / 2);
await scrollToRow(firstWidget, targetRow, sharedPage);
const cellsAfterScroll = await firstWidget.locator('.ag-cell').all();
expect(cellsAfterScroll.length).toBeGreaterThan(0);
} catch (e) {
const cells = await firstWidget.locator('.ag-cell').all();
expect(cells.length).toBeGreaterThan(0);
}
});Helper functions needed
These utility functions are used by the tests above and should be preserved/restored:
async function getCellText(container, colId, rowIndex) { ... }
async function getRowCount(container) { ... }
async function scrollToRow(container, targetRow, page) { ... }Notes
- All tests share a single page load (Pyodide init takes 15-30s)
- Tests run in serial mode on the shared page
- Use
npx serve(not Python http.server) for the WASM file server - Config:
playwright.config.wasm-marimo.ts
🤖 Generated with Claude Code
Activity
Trim WASM tests to single smoke test for CI reliability
Trim WASM tests to single smoke test for CI reliability
Trim WASM tests to single smoke test for CI reliability
paddymul commentedon Feb 26, 2026
Implementation Plan
Overview
Re-enable the WASM marimo Playwright tests that were trimmed to a single smoke test.
Steps
Inventory disabled tests — check
packages/buckaroo-js-core/pw-tests/wasm-marimo.spec.tsfor the full list of tests that were commented out or removed.Re-enable incrementally — add tests back one at a time:
Fix flakiness for each re-enabled test:
waitForSelectororwaitForFunctionguards before assertionsCI config — ensure the WASM test job has:
Gate — once all tests pass reliably for 5+ consecutive CI runs, remove the "trimmed" comment and consider this done.
Files to modify
packages/buckaroo-js-core/pw-tests/wasm-marimo.spec.ts— re-enable tests@codex
chatgpt-codex-connector commentedon Feb 26, 2026
Summary
getCellText,getRowCount,scrollToRow), then added coverage for baseline rendering, headers/cells, optional second widget, scroll responsiveness, and basic sort/search interactions. packages/buckaroo-js-core/pw-tests/wasm-marimo.spec.tsL1-L158Testing
bash scripts/test_playwright_wasm_marimo.sh(failed in this environment because Playwright Chromium download returned upstream HTTP 403 from CDN).cd packages/buckaroo-js-core && pnpm exec playwright test --config playwright.config.wasm-marimo.ts --listView task →
paddymul commentedon Feb 26, 2026
Related: PRs #509, #531, #532, #542
The WASM marimo test infrastructure is now in place. The remaining work is re-enabling the specific tests listed in this issue one by one and fixing any flakiness. See also #502 (pyodide CI).