src/third_party/closure_library/closure/goog/testing/mockrandom_test.js

// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

goog.provide('goog.testing.MockRandomTest');
goog.setTestOnly('goog.testing.MockRandomTest');

goog.require('goog.testing.MockRandom');
goog.require('goog.testing.jsunit');

function testMockRandomInstall() {
  var random = new goog.testing.MockRandom([]);
  var originalRandom = Math.random;

  assertFalse(!!random.installed_);

  random.install();
  assertTrue(random.installed_);
  assertNotEquals(Math.random, originalRandom);

  random.uninstall();
  assertFalse(random.installed_);
  assertEquals(originalRandom, Math.random);
}

function testMockRandomRandom() {
  var random = new goog.testing.MockRandom([], true);

  assertFalse(random.hasMoreValues());

  random.inject(2);
  assertTrue(random.hasMoreValues());
  assertEquals(2, Math.random());

  random.inject([1, 2, 3]);
  assertTrue(random.hasMoreValues());
  assertEquals(1, Math.random());
  assertEquals(2, Math.random());
  assertEquals(3, Math.random());
  assertFalse(random.hasMoreValues());
  assertNotUndefined(Math.random());
}

function testRandomStrictlyFromSequence() {
  var random = new goog.testing.MockRandom([], /* install */ true);
  random.setStrictlyFromSequence(true);
  assertFalse(random.hasMoreValues());
  assertThrows(function() {
    Math.random();
  });

  random.inject(3);
  assertTrue(random.hasMoreValues());
  assertNotThrows(function() {
    Math.random();
  });

  random.setStrictlyFromSequence(false);
  assertFalse(random.hasMoreValues());
  assertNotThrows(function() {
    Math.random();
  });
}