feat(tstest): add support for package.json before scripts during test execution

ts/tstest.classes.beforescripts.ts

@@ -0,0 +1,86 @@
+import * as plugins from './tstest.plugins.js';
+import type { TsTestLogger } from './tstest.logging.js';
+import type { Smartshell } from '@push.rocks/smartshell';
+
+export interface IBeforeScripts {
+  /** The "test:before" or "test:before:once" script command, or null if not defined */
+  beforeOnce: string | null;
+  /** The "test:before:testfile" script command, or null if not defined */
+  beforeTestfile: string | null;
+}
+
+/**
+ * Load before-script commands from the project's package.json scripts section.
+ */
+export function loadBeforeScripts(cwd: string): IBeforeScripts {
+  const result: IBeforeScripts = { beforeOnce: null, beforeTestfile: null };
+
+  try {
+    const packageJsonPath = plugins.path.join(cwd, 'package.json');
+    const packageJson = JSON.parse(plugins.fs.readFileSync(packageJsonPath, 'utf8'));
+    const scripts = packageJson?.scripts;
+    if (!scripts) return result;
+
+    // test:before takes precedence over test:before:once (they are aliases)
+    if (scripts['test:before']) {
+      result.beforeOnce = scripts['test:before'];
+      if (scripts['test:before:once']) {
+        console.warn('Warning: Both "test:before" and "test:before:once" are defined. Using "test:before".');
+      }
+    } else if (scripts['test:before:once']) {
+      result.beforeOnce = scripts['test:before:once'];
+    }
+
+    if (scripts['test:before:testfile']) {
+      result.beforeTestfile = scripts['test:before:testfile'];
+    }
+  } catch {
+    // No package.json or parse error — return defaults
+  }
+
+  return result;
+}
+
+/**
+ * Execute a before-script command and return whether it succeeded.
+ */
+export async function runBeforeScript(
+  smartshellInstance: Smartshell,
+  command: string,
+  label: string,
+  logger: TsTestLogger,
+  env?: { TSTEST_FILE?: string; TSTEST_RUNTIME?: string },
+): Promise<boolean> {
+  logger.beforeScriptStart(label, command);
+  const startTime = Date.now();
+
+  // Set environment variables if provided
+  const envKeysSet: string[] = [];
+  if (env) {
+    for (const [key, value] of Object.entries(env)) {
+      if (value !== undefined) {
+        process.env[key] = value;
+        envKeysSet.push(key);
+      }
+    }
+  }
+
+  try {
+    const execResult = await smartshellInstance.execStreaming(command);
+    const result = await execResult.finalPromise;
+    const durationMs = Date.now() - startTime;
+    const success = result.exitCode === 0;
+
+    logger.beforeScriptEnd(label, success, durationMs);
+    return success;
+  } catch {
+    const durationMs = Date.now() - startTime;
+    logger.beforeScriptEnd(label, false, durationMs);
+    return false;
+  } finally {
+    // Clean up environment variables
+    for (const key of envKeysSet) {
+      delete process.env[key];
+    }
+  }
+}