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gaia/apps/calendar/test/unit/common/promise_test.js

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+define(function(require) {
+'use strict';
+
+var promise = require('common/promise');
+
+function errorOrFive(shouldError, callback) {
+  var error;
+  if (shouldError) {
+    error = new Error('You told me to error!');
+  } else {
+    error = null;
+  }
+
+  return callback(error, !shouldError && 5);
+}
+
+suite('denodeify', function() {
+  var subject;
+
+  setup(function() {
+    subject = promise.denodeify(errorOrFive);
+  });
+
+  test('node-style error', function(done) {
+    subject(true /* shouldError */, function(error) {
+      assert.instanceOf(error, Error);
+      assert.strictEqual(error.message, 'You told me to error!');
+      done();
+    });
+  });
+
+  test('node-style without error', function(done) {
+    subject(false /* shouldError */, function(error, result) {
+      assert.isNull(error);
+      assert.strictEqual(result, 5);
+      done();
+    });
+  });
+
+  test('promise with error', function(done) {
+    subject(true /* shouldError */)
+    .catch(function(error) {
+      assert.instanceOf(error, Error);
+      assert.strictEqual(error.message, 'You told me to error!');
+      done();
+    });
+  });
+
+  test('promise without error', function(done) {
+    subject(false /* shouldError */)
+    .then(function(value) {
+      assert.strictEqual(value, 5);
+      done();
+    });
+  });
+
+  test('no callback and no promise', function() {
+    // Should not hiccup.
+    subject(false /* shouldError */);
+  });
+});
+
+function SlowCalculator() {
+  this.currentValue = 0;
+  promise.denodeifyAll(this, [
+    'add',
+    'multiply'
+  ]);
+}
+
+SlowCalculator.prototype = {
+  add: function(x, callback) {
+    var error = null;
+    if (typeof x !== 'number') {
+      error = new Error('Can only add numbers!');
+    }
+
+    this.currentValue += x;
+    setTimeout(function() {
+      callback(error, error || this.currentValue);
+    }.bind(this), 10);
+  },
+
+  multiply: function(x, callback) {
+    var error = null;
+    if (typeof x !== 'number') {
+      error = new Error('Can only multiply numbers!');
+    }
+
+    this.currentValue *= x;
+    setTimeout(function() {
+      callback(error, error || this.currentValue);
+    }.bind(this), 10);
+  }
+};
+
+suite('denodeifyAll', function() {
+  var subject;
+
+  setup(function() {
+    subject = new SlowCalculator();
+  });
+
+  test('node-style error', function(done) {
+    subject.multiply('lolcats', function(error) {
+      assert.instanceOf(error, Error);
+      assert.strictEqual(error.message, 'Can only multiply numbers!');
+      done();
+    });
+  });
+
+  test('node-style without error', function(done) {
+    subject.add(5, function(error, result) {
+      assert.isNull(error);
+      assert.strictEqual(result, 5);
+      done();
+    });
+  });
+
+  test('promise with error', function(done) {
+    subject.add(/\s+/).catch(function(error) {
+      assert.instanceOf(error, Error);
+      assert.strictEqual(error.message, 'Can only add numbers!');
+      done();
+    });
+  });
+
+  test('promise without error', function(done) {
+    subject.add(9)
+    .then(function(value) {
+      assert.strictEqual(value, 9);
+      return subject.multiply(8);
+    })
+    .then(function(value) {
+      assert.strictEqual(value, 72);
+      done();
+    });
+  });
+
+  test('no callback and no promise', function() {
+    // Should not hiccup.
+    subject.multiply(3.14);
+  });
+});
+
+});