08-27-周三_17-09-29

node_modules/weak/test/callback.js

@@ -0,0 +1,102 @@
+var assert = require('assert')
+var weak = require('../')
+
+describe('weak()', function () {
+
+  afterEach(gc)
+
+  describe('garbage collection callback', function () {
+
+    it('should accept a function as second argument', function () {
+      var r = weak({}, function () {})
+      assert.equal(1, weak.callbacks(r).length)
+    })
+
+    it('should invoke the callback before the target is gc\'d', function () {
+      var called = false
+      weak({}, function () {
+        called = true
+      })
+      assert(!called)
+      gc()
+      assert(called)
+    })
+
+    it('should invoke *all* callbacks in the internal "callback" Array'
+    , function () {
+      var r = weak({})
+        , called1 = false
+        , called2 = false
+      weak.addCallback(r, function () {
+        called1 = true
+      })
+      weak.addCallback(r, function () {
+        called2 = true
+      })
+      gc()
+      assert(called1)
+      assert(called2)
+    })
+
+    it('should preempt code for GC callback but not nextTick callbacks'
+    , function(done) {
+      var calledGcCallback = false
+      , calledTickCallback = false
+      weak({}, function() {
+        calledGcCallback = true
+      })
+
+      process.nextTick(function() {
+        calledTickCallback = true
+      });
+
+      assert(!calledGcCallback)
+      assert(!calledTickCallback)
+      gc()
+      assert(calledGcCallback)
+      assert(!calledTickCallback)
+      setTimeout(function() {
+        assert(calledTickCallback);
+        done();
+      }, 0)
+    })
+
+  })
+})
+
+describe('callbacks()', function () {
+
+  it('should return the Weakref\'s "callback" Array', function () {
+    var r = weak({}, function() {})
+      , callbacks = weak.callbacks(r)
+    assert(Array.isArray(callbacks))
+    assert.equal(1, callbacks.length)
+  })
+
+})
+
+describe('removeCallback()', function() {
+
+  it('removed callbacks should not be called', function() {
+    var called = false
+      , fn = function() { called = true }
+      , r = weak({}, fn)
+    weak.removeCallback(r, fn)
+    gc()
+    assert(!called)
+  })
+
+})
+
+describe('removeCallbacks()', function() {
+
+  it('removed callbacks should not be called', function() {
+     var called = false
+      , fn = function() { called = true }
+      , r = weak({}, fn)
+     weak.removeCallbacks(r)
+     gc()
+     assert(!called)
+  })
+
+})