Test manifest integration with deferred-leveldown (#681)

Author: vweevers

test/self.js

@@ -52,6 +52,9 @@ suite({
   encodings: false
 })
 
+// Integration tests that can't use a generic testCommon.factory()
+require('./self/manifest-test')
+
 if (!process.browser) {
   require('./browserify-test')(test)
 }

test/self/manifest-test.js

@@ -0,0 +1,60 @@
+'use strict'
+
+var test = require('tape')
+var levelup = require('../..')
+var memdown = require('memdown')
+var sinon = require('sinon')
+
+test('manifest: additionalMethod is proxied', function (t) {
+  var mem = memdown()
+
+  mem.beep = sinon.spy()
+  mem.supports = { additionalMethods: { beep: true } }
+
+  var db = levelup(mem)
+
+  t.is(typeof db.beep, 'function')
+  t.is(typeof levelup.prototype.beep, 'undefined')
+
+  db.beep()
+  t.is(mem.beep.callCount, 0, 'deferred')
+
+  db.on('open', function () {
+    t.is(mem.beep.callCount, 1)
+    t.same(mem.beep.getCall(0).args, [])
+
+    db.beep('boop')
+    t.same(mem.beep.getCall(1).args, ['boop'])
+
+    db.close(t.end.bind(t))
+  })
+})
+
+test('manifest: additionalMethod is proxied even if function does not exist', function (t) {
+  var mem = memdown()
+  mem.supports = { additionalMethods: { beep: true } }
+  var db = levelup(mem)
+
+  t.is(typeof db.beep, 'function')
+  t.is(typeof levelup.prototype.beep, 'undefined')
+  t.end()
+})
+
+test('manifest: approximateSize() et al are proxied even if manifest does not exist', function (t) {
+  var mem = memdown()
+
+  // deferred-leveldown should feature-detect these methods (for now)
+  mem.approximateSize = function () {}
+  mem.compactRange = function () {}
+
+  mem.otherMethod = function () {}
+  mem.supports = null
+
+  var db = levelup(mem)
+
+  t.is(typeof db.approximateSize, 'function')
+  t.is(typeof db.compactRange, 'function')
+  t.is(typeof db.otherMethod, 'undefined')
+
+  t.end()
+})