test(opencode): simplify bootstrap cache coverage

tests/opencode/test-bootstrap-caching.mjs

@@ -0,0 +1,124 @@
+import fs from 'fs';
+import { pathToFileURL } from 'url';
+
+const [, , pluginPath, scenario] = process.argv;
+
+if (!pluginPath || !['present', 'missing'].includes(scenario)) {
+  console.error('Usage: node test-bootstrap-caching.mjs PLUGIN_PATH present|missing');
+  process.exit(2);
+}
+
+let existsCount = 0;
+let readCount = 0;
+
+const originalExistsSync = fs.existsSync;
+const originalReadFileSync = fs.readFileSync;
+
+fs.existsSync = function (...args) {
+  if (isBootstrapSkillPath(args[0])) {
+    existsCount += 1;
+  }
+  return originalExistsSync.apply(this, args);
+};
+
+fs.readFileSync = function (...args) {
+  if (isBootstrapSkillPath(args[0])) {
+    readCount += 1;
+  }
+  return originalReadFileSync.apply(this, args);
+};
+
+const mod = await import(pathToFileURL(pluginPath).href);
+const plugin = await mod.SuperpowersPlugin({ client: {}, directory: '.' });
+const transform = plugin['experimental.chat.messages.transform'];
+
+const firstOutput = makeOutput(`${scenario} bootstrap first step`);
+await transform({}, firstOutput);
+const afterFirst = { existsCount, readCount };
+
+const secondOutput = makeOutput(`${scenario} bootstrap second step`);
+await transform({}, secondOutput);
+const afterSecond = { existsCount, readCount };
+
+const result = {
+  scenario,
+  firstBootstrapParts: countBootstrapParts(firstOutput),
+  secondBootstrapParts: countBootstrapParts(secondOutput),
+  firstReadCount: afterFirst.readCount,
+  secondReadCount: afterSecond.readCount,
+  firstExistsCount: afterFirst.existsCount,
+  secondExistsCount: afterSecond.existsCount,
+};
+
+const failures = scenario === 'present'
+  ? assertPresentBootstrap(result)
+  : assertMissingBootstrap(result);
+
+if (failures.length > 0) {
+  console.error(JSON.stringify(result, null, 2));
+  for (const failure of failures) {
+    console.error(`FAIL: ${failure}`);
+  }
+  process.exit(1);
+}
+
+console.log(JSON.stringify(result, null, 2));
+
+function isBootstrapSkillPath(filePath) {
+  return String(filePath).replaceAll('\\', '/').includes('using-superpowers/SKILL.md');
+}
+
+function makeOutput(text) {
+  return {
+    messages: [{
+      info: { role: 'user' },
+      parts: [{ type: 'text', text }],
+    }],
+  };
+}
+
+function countBootstrapParts(output) {
+  return output.messages[0].parts.filter(
+    (part) => part.type === 'text' && part.text.includes('EXTREMELY_IMPORTANT')
+  ).length;
+}
+
+function assertPresentBootstrap(result) {
+  const failures = [];
+  if (result.firstBootstrapParts !== 1) {
+    failures.push(`expected first transform to inject one bootstrap part, got ${result.firstBootstrapParts}`);
+  }
+  if (result.secondBootstrapParts !== 1) {
+    failures.push(`expected second transform to inject one bootstrap part, got ${result.secondBootstrapParts}`);
+  }
+  if (result.firstReadCount !== 1) {
+    failures.push(`expected first transform to read SKILL.md once, got ${result.firstReadCount}`);
+  }
+  if (result.secondReadCount !== result.firstReadCount) {
+    failures.push(`expected cached second transform to do no additional reads, got ${result.secondReadCount - result.firstReadCount}`);
+  }
+  if (result.secondExistsCount !== result.firstExistsCount) {
+    failures.push(`expected cached second transform to do no additional exists checks, got ${result.secondExistsCount - result.firstExistsCount}`);
+  }
+  return failures;
+}
+
+function assertMissingBootstrap(result) {
+  const failures = [];
+  if (result.firstBootstrapParts !== 0) {
+    failures.push(`expected no bootstrap when SKILL.md is missing, got ${result.firstBootstrapParts}`);
+  }
+  if (result.secondBootstrapParts !== 0) {
+    failures.push(`expected no bootstrap on second missing-file transform, got ${result.secondBootstrapParts}`);
+  }
+  if (result.firstReadCount !== 0 || result.secondReadCount !== 0) {
+    failures.push(`expected missing file path to avoid reads, got ${result.secondReadCount}`);
+  }
+  if (result.firstExistsCount < 1) {
+    failures.push('expected first transform to check whether SKILL.md exists');
+  }
+  if (result.secondExistsCount !== result.firstExistsCount) {
+    failures.push(`expected missing-file result to be cached, got ${result.secondExistsCount - result.firstExistsCount} extra exists checks`);
+  }
+  return failures;
+}