set hyperdb instance via storage arg

Author: Benjamin Forster

index.js

@@ -28,7 +28,7 @@ function Graph (storage, key, opts) {
   }
 
   opts = opts || {}
-  this.db = hyperdb(storage, key, opts)
+  this.db = (storage instanceof hyperdb) ? storage : hyperdb(storage, key, opts)
   this._prefixes = Object.assign({}, opts.prefixes || constants.DEFAULT_PREFIXES)
   this._basename = opts.name || constants.DEFAULT_BASE
   this._prefixes._ = this._basename

test/basic.spec.js

@@ -19,6 +19,15 @@ function ramStore (filename) {
 
 describe('hypergraph', function () {
   let db
+  describe('constructor storage argument', () => {
+    context('with instance of hyperdb', () => {
+      it('sets graph database to hyperdb passed into the constructor', () => {
+        var hyperdbInstance = hyperdb(ramStore)
+        db = hypergraph(hyperdbInstance)
+        expect(db.db).to.eql(hyperdbInstance)
+      })
+    })
+  })
   context('when newly created it adds metadata to db', () => {
     it('includes graph version', (done) => {
       db = hypergraph(ramStore)