feat: mark CSFLE helper collections as system collections COMPASS-5624 (#42)

Author: addaleax

index.js

@@ -16,7 +16,7 @@ function NS(ns) {
     this.collection = ns.slice(this.dotIndex + 1);
   }
 
-  this.system = /^system\./.test(this.collection);
+  this.system = /^(?:system|enxcol_)\./.test(this.collection);
   this.oplog = /local\.oplog\.(\$main|rs)/.test(ns);
 
   this.command =

test.js

@@ -42,6 +42,9 @@ describe('ns', function() {
     it('should acccept `a.system.foo`', function() {
       assert(ns('a.system.foo').special);
     });
+    it('should acccept `a.enxcol_.foo`', function() {
+      assert(ns('a.enxcol_.foo').special);
+    });
     it('should not accept `a.foo`', function() {
       assert.equal(ns('a.foo').special, false);
     });