build(test): recursively find test files; fail on unsupported dependency versions (#231)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/a1c25589-9aeb-49f0-922e-4037066a83df/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@fdd03c1

Author: yoshi-automation

handwritten/promisify/.mocharc.js

@@ -14,7 +14,8 @@
 const config = {
   "enable-source-maps": true,
   "throw-deprecation": true,
-  "timeout": 10000
+  "timeout": 10000,
+  "recursive": true
 }
 if (process.env.MOCHA_THROW_DEPRECATION === 'false') {
   delete config['throw-deprecation'];

handwritten/promisify/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-promisify.git",
-        "sha": "b69d74151c484a8b01897114b858bd776f3ebfb8"
+        "sha": "19c5ed708f00221b6f0ad9db3b8030c7c3f58647"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "8cf6d2834ad14318e64429c3b94f6443ae83daf9"
+        "sha": "fdd03c161003ab97657cc0218f25c82c89ddf4b6"
       }
     }
   ],