test(NODE-4224): fix spec runner with encrypted fields

Author: durran

test/tools/spec-runner/index.js

@@ -261,7 +261,13 @@ function prepareDatabaseForSuite(suite, context) {
 
   const coll = db.collection(context.collectionName);
   return setupPromise
-    .then(() => coll.drop({ writeConcern: { w: 'majority' } }))
+    .then(() => {
+      const options = { writeConcern: { w: 'majority' } };
+      if (suite.encrypted_fields) {
+        options.encryptedFields = suite.encrypted_fields;
+      };
+      coll.drop(options);
+    })
     .catch(err => {
       if (!err.message.match(/ns not found/)) throw err;
     })
@@ -289,6 +295,9 @@ function prepareDatabaseForSuite(suite, context) {
       if (suite.json_schema) {
         options.validator = { $jsonSchema: suite.json_schema };
       }
+      if (suite.encrypted_fields) {
+        options.encryptedFields = suite.encrypted_fields;
+      }
 
       return db.createCollection(context.collectionName, options);
     })