test(NODE-3284): add maxPoolSize=0 spec tests (#2830)

Author: durran

test/spec/uri-options/connection-pool-options.json

@@ -2,13 +2,15 @@
   "tests": [
     {
       "description": "Valid connection pool options are parsed correctly",
-      "uri": "mongodb://example.com/?maxIdleTimeMS=50000",
+      "uri": "mongodb://example.com/?maxIdleTimeMS=50000&maxPoolSize=5&minPoolSize=3",
       "valid": true,
       "warning": false,
       "hosts": null,
       "auth": null,
       "options": {
-        "maxIdleTimeMS": 50000
+        "maxIdleTimeMS": 50000,
+        "maxPoolSize": 5,
+        "minPoolSize": 3
       }
     },
     {
@@ -28,6 +30,28 @@
       "hosts": null,
       "auth": null,
       "options": {}
+    },
+    {
+      "description": "maxPoolSize=0 does not error",
+      "uri": "mongodb://example.com/?maxPoolSize=0",
+      "valid": true,
+      "warning": false,
+      "hosts": null,
+      "auth": null,
+      "options": {
+        "maxPoolSize": 0
+      }
+    },
+    {
+      "description": "minPoolSize=0 does not error",
+      "uri": "mongodb://example.com/?minPoolSize=0",
+      "valid": true,
+      "warning": false,
+      "hosts": null,
+      "auth": null,
+      "options": {
+        "minPoolSize": 0
+      }
     }
   ]
 }

test/spec/uri-options/connection-pool-options.yml

@@ -1,13 +1,15 @@
 tests:
     -
         description: "Valid connection pool options are parsed correctly"
-        uri: "mongodb://example.com/?maxIdleTimeMS=50000"
+        uri: "mongodb://example.com/?maxIdleTimeMS=50000&maxPoolSize=5&minPoolSize=3"
         valid: true
         warning: false
         hosts: ~
         auth: ~
         options:
             maxIdleTimeMS: 50000
+            maxPoolSize: 5
+            minPoolSize: 3
     -
         description: "Non-numeric maxIdleTimeMS causes a warning"
         uri: "mongodb://example.com/?maxIdleTimeMS=invalid"
@@ -24,3 +26,23 @@ tests:
         hosts: ~
         auth: ~
         options: {}
+
+    -
+      description: "maxPoolSize=0 does not error"
+      uri: "mongodb://example.com/?maxPoolSize=0"
+      valid: true
+      warning: false
+      hosts: ~
+      auth: ~
+      options:
+          maxPoolSize: 0
+
+    -
+      description: "minPoolSize=0 does not error"
+      uri: "mongodb://example.com/?minPoolSize=0"
+      valid: true
+      warning: false
+      hosts: ~
+      auth: ~
+      options:
+          minPoolSize: 0