test: check version strings have expected pattern

Many were checked, but a few were not.

test/parallel/test-process-versions.js

@@ -34,9 +34,26 @@ assert(/^\d+\.\d+\.\d+(?:\.\d+)?-node\.\d+(?: \(candidate\))?$/
 assert(/^\d+$/.test(process.versions.modules));
 
 if (common.hasCrypto) {
+  // example: 1.1.0i
   assert(/^\d+\.\d+\.\d+[a-z]?$/.test(process.versions.openssl));
 }
 
+// example: 3
+assert(/^\d+$/.test(process.versions.napi));
+// example: 1.34.0
+assert(/^\d+\.\d+\.\d+$/.test(process.versions.nghttp2));
+
+if (common.hasIntl) {
+  // example: 2018e
+  assert(/^\d{4}[a-z]$/.test(process.versions.tz));
+  // example: 33.1
+  assert(/^\d+\.\d+$/.test(process.versions.cldr));
+  // example: 62.1
+  assert(/^\d+\.\d+$/.test(process.versions.icu));
+  // example: 11.0
+  assert(/^\d+\.\d+$/.test(process.versions.unicode));
+}
+
 for (let i = 0; i < expected_keys.length; i++) {
   const key = expected_keys[i];
   const descriptor = Object.getOwnPropertyDescriptor(process.versions, key);