Validate E2E cleanup duration

utils/cleanupDBs.test.js

@@ -1,9 +1,23 @@
 const assert = require("node:assert/strict");
 const test = require("node:test");
-const { shouldDeleteResource } = require("./cleanupDBs");
+const { parseCleanupMinimumAge, shouldDeleteResource } = require("./cleanupDBs");
 
 const cleanupThreshold = Date.now();
 
+test("uses a six-hour cleanup age when no value is configured", () => {
+  assert.equal(parseCleanupMinimumAge(undefined), 6 * 60 * 60 * 1000);
+});
+
+test("accepts a finite positive cleanup age", () => {
+  assert.equal(parseCleanupMinimumAge("12h"), 12 * 60 * 60 * 1000);
+});
+
+test("rejects unsafe cleanup ages", () => {
+  for (const configuredAge of ["", "invalid", "0ms", "-1h", "Infinity"]) {
+    assert.throws(() => parseCleanupMinimumAge(configuredAge), /E2E_CLEANUP_MINIMUM_AGE must be a positive duration/);
+  }
+});
+
 test("deletes owned test resources older than the threshold", () => {
   assert.equal(shouldDeleteResource("t_12345_1_dbab_1000", cleanupThreshold - 1, cleanupThreshold), true);
 });