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NetMesh/components/terminal/terminalSafeFitVisibility.test.ts

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import assert from 'node:assert/strict';
import { readFileSync } from 'node:fs';
import test from 'node:test';
const source = readFileSync(new URL('../Terminal.tsx', import.meta.url), 'utf8');
test('safeFit skips only renderers suspended by hibernate unless explicitly allowed', () => {
assert.match(
source,
/if \(!isRendererActiveRef\.current && !options\?\.allowHidden\) \{\s*lastFittedSizeRef\.current = null;\s*return;\s*\}/,
);
});
test('safeFit can run synchronously for immediate layout changes', () => {
assert.match(source, /immediate\?: boolean/);
assert.match(
source,
/XTERM_PERFORMANCE_CONFIG\.resize\.useRAF &&\s*typeof requestAnimationFrame === "function" &&\s*!options\?\.immediate/,
);
});
test('safeFit clears the WebGL atlas on pixel-only layout changes', () => {
// Opening the SFTP side panel often changes container px without changing
// cols/rows, so term.onResize (which clears the atlas) never fires. Without
// this else-branch recovery, WebGL paints stale glyphs as black squares (#2013).
assert.match(
source,
/if \(term\.cols !== dimensions\.cols \|\| term\.rows !== dimensions\.rows\) \{\s*term\.resize\(dimensions\.cols, dimensions\.rows\);\s*forceSyncRenderAfterResize\(term\);\s*\} else \{\s*[\s\S]*?xtermRuntimeRef\.current\?\.clearTextureAtlas\(\);\s*forceSyncRenderAfterResize\(term\);\s*\}/,
);
});
test('safeFit waits for normal xterm callbacks before resizing', () => {
const pendingGuardIndex = source.indexOf('if (hasPendingTerminalWrites(term))');
const settleIndex = source.indexOf('runWithTerminalOutputPausedAfterWritesSettle(', pendingGuardIndex);
const sessionGuardIndex = source.indexOf('sessionRef.current !== fitSessionId', settleIndex);
const immediateFitIndex = source.indexOf('safeFit({ ...fitRequest.options, immediate: true })', sessionGuardIndex);
const resizeIndex = source.indexOf('term.resize(dimensions.cols, dimensions.rows)', pendingGuardIndex);
assert.ok(pendingGuardIndex >= 0);
assert.ok(settleIndex > pendingGuardIndex);
assert.ok(sessionGuardIndex > settleIndex);
assert.ok(immediateFitIndex > settleIndex);
assert.ok(resizeIndex > immediateFitIndex);
});
test('safeFit retries against a replacement backend session', () => {
const pendingGuardIndex = source.indexOf('if (hasPendingTerminalWrites(term))');
const replacementGuardIndex = source.indexOf(
'if (sessionRef.current !== fitSessionId)',
pendingGuardIndex,
);
const clearIndex = source.indexOf('pendingWriteSafeFitRef.current = null', replacementGuardIndex);
const retryIndex = source.indexOf('setTimeout(() => safeFit(fitRequest.options), 0)', clearIndex);
assert.ok(replacementGuardIndex > pendingGuardIndex);
assert.ok(clearIndex > replacementGuardIndex);
assert.ok(retryIndex > clearIndex);
});