1 files changed, 76 insertions, 0 deletions
diff --git a/addon-sdk/source/test/test-dispatcher.js b/addon-sdk/source/test/test-dispatcher.js
new file mode 100644
index 000000000..437d75176
--- /dev/null
+++ b/addon-sdk/source/test/test-dispatcher.js
@@ -0,0 +1,76 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const { dispatcher } = require("sdk/util/dispatcher");
+
+exports["test dispatcher API"] = assert => {
+  const dispatch = dispatcher();
+
+  assert.equal(typeof(dispatch), "function",
+               "dispatch is a function");
+
+  assert.equal(typeof(dispatch.define), "function",
+               "dispatch.define is a function");
+
+  assert.equal(typeof(dispatch.implement), "function",
+               "dispatch.implement is a function");
+
+  assert.equal(typeof(dispatch.when), "function",
+               "dispatch.when is a function");
+};
+
+exports["test dispatcher"] = assert => {
+  const isDuck = dispatcher();
+
+  const quacks = x => x && typeof(x.quack) === "function";
+
+  const Duck = function() {};
+  const Goose = function() {};
+
+  const True = _ => true;
+  const False = _ => false;
+
+
+
+  isDuck.define(Goose, False);
+  isDuck.define(Duck, True);
+  isDuck.when(quacks, True);
+
+  assert.equal(isDuck(new Goose()), false,
+               "Goose ain't duck");
+
+  assert.equal(isDuck(new Duck()), true,
+               "Ducks are ducks");
+
+  assert.equal(isDuck({ quack: () => "Quaaaaaack!" }), true,
+               "It's a duck if it quacks");
+
+
+  assert.throws(() => isDuck({}), /Type does not implements method/, "not implemneted");
+
+  isDuck.define(Object, False);
+
+  assert.equal(isDuck({}), false,
+               "Ain't duck if it does not quacks!");
+};
+
+exports["test redefining fails"] = assert => {
+  const isPM = dispatcher();
+  const isAfternoon = time => time.getHours() > 12;
+
+  isPM.when(isAfternoon, _ => true);
+
+  assert.equal(isPM(new Date(Date.parse("Jan 23, 1985, 13:20:00"))), true,
+               "yeap afternoon");
+  assert.equal(isPM({ getHours: _ => 17 }), true,
+                "seems like afternoon");
+
+  assert.throws(() => isPM.when(isAfternoon, x => x > 12 && x < 24),
+                /Already implemented for the given predicate/,
+               "can't redefine on same predicate");
+
+};
+
+require("sdk/test").run(exports);