fix drop logic

Author: baileympearson

test/tools/unified-spec-runner/runner.ts

@@ -143,17 +143,29 @@ async function runUnifiedTest(
       trace('initialData');
       for (const { databaseName, collectionName } of unifiedSuite.initialData) {
         const db = utilClient.db(databaseName);
-        const collection = db.collection(collectionName, {
-          writeConcern: { w: 'majority' }
-        });
 
-        trace('drop');
-        expect(
-          await collection.drop({
-            // Specifying any encrypted fields causes `collection.drop()` to drop the esoc and esc collections as well.
-            encryptedFields: {}
-          })
-        ).to.be.true;
+        trace('listCollections');
+        const allCollections = new Set(
+          await db
+            .listCollections()
+            .map(({ name }) => name)
+            .toArray()
+        );
+
+        const collections = [
+          collectionName,
+          `enxcol_.${collectionName}.esc`,
+          `enxcol_.${collectionName}.ecoc`
+        ].filter(allCollections.has.bind(allCollections));
+
+        for (const name of collections) {
+          const collection = db.collection(name, {
+            writeConcern: { w: 'majority' }
+          });
+
+          trace('drop');
+          expect(await collection.drop()).to.be.true;
+        }
       }
 
       for (const {