virtualselectionstack.js 5.3 KB

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  1. /**
  2. * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
  3. * For licensing, see LICENSE.md.
  4. */
  5. import VirtualSelectionStack from '../src/virtualselectionstack';
  6. describe( 'VirtualSelectionStack', () => {
  7. let stack;
  8. beforeEach( () => {
  9. stack = new VirtualSelectionStack();
  10. } );
  11. it( 'should fire event when new descriptor is provided to an empty stack', () => {
  12. const spy = sinon.spy();
  13. const descriptor = { priority: 10, class: 'css-class' };
  14. stack.on( 'change:top', spy );
  15. stack.add( descriptor );
  16. sinon.assert.calledOnce( spy );
  17. expect( spy.firstCall.args[ 1 ].newDescriptor ).to.equal( descriptor );
  18. expect( spy.firstCall.args[ 1 ].oldDescriptor ).to.be.undefined;
  19. } );
  20. it( 'should fire event when new top element has changed', () => {
  21. const spy = sinon.spy();
  22. const descriptor = { priority: 10, class: 'css-class' };
  23. const secondDescriptor = { priority: 11, class: 'css-class' };
  24. stack.on( 'change:top', spy );
  25. stack.add( descriptor );
  26. stack.add( secondDescriptor );
  27. sinon.assert.calledTwice( spy );
  28. expect( spy.secondCall.args[ 1 ].newDescriptor ).to.equal( secondDescriptor );
  29. expect( spy.secondCall.args[ 1 ].oldDescriptor ).to.equal( descriptor );
  30. } );
  31. it( 'should not fire event when element with lower priority was added', () => {
  32. const spy = sinon.spy();
  33. const descriptor = { priority: 10, class: 'css-class' };
  34. const secondDescriptor = { priority: 9, class: 'css-class' };
  35. stack.on( 'change:top', spy );
  36. stack.add( descriptor );
  37. stack.add( secondDescriptor );
  38. sinon.assert.calledOnce( spy );
  39. expect( spy.firstCall.args[ 1 ].newDescriptor ).to.equal( descriptor );
  40. expect( spy.firstCall.args[ 1 ].oldDescriptor ).to.be.undefined;
  41. } );
  42. it( 'should fire event when top element was removed', () => {
  43. const spy = sinon.spy();
  44. const descriptor = { priority: 10, class: 'css-class' };
  45. const secondDescriptor = { priority: 11, class: 'css-class' };
  46. stack.add( descriptor );
  47. stack.add( secondDescriptor );
  48. stack.on( 'change:top', spy );
  49. stack.remove( secondDescriptor );
  50. sinon.assert.calledOnce( spy );
  51. expect( spy.firstCall.args[ 1 ].oldDescriptor ).to.equal( secondDescriptor );
  52. expect( spy.firstCall.args[ 1 ].newDescriptor ).to.equal( descriptor );
  53. } );
  54. it( 'should not fire event when other than top element is removed', () => {
  55. const spy = sinon.spy();
  56. const descriptor = { priority: 10, class: 'css-class' };
  57. const secondDescriptor = { priority: 11, class: 'css-class' };
  58. stack.add( descriptor );
  59. stack.add( secondDescriptor );
  60. stack.on( 'change:top', spy );
  61. stack.remove( descriptor );
  62. sinon.assert.notCalled( spy );
  63. } );
  64. it( 'should not fire event when same descriptor is added', () => {
  65. const spy = sinon.spy();
  66. const descriptor = { priority: 10, class: 'css-class' };
  67. const secondDescriptor = { priority: 10, class: 'css-class' };
  68. stack.on( 'change:top', spy );
  69. stack.add( descriptor );
  70. stack.add( secondDescriptor );
  71. sinon.assert.calledOnce( spy );
  72. expect( spy.firstCall.args[ 1 ].newDescriptor ).to.equal( descriptor );
  73. expect( spy.firstCall.args[ 1 ].oldDescriptor ).to.be.undefined;
  74. } );
  75. it( 'should not fire when trying to remove from empty stack', () => {
  76. const spy = sinon.spy();
  77. const descriptor = { priority: 10, class: 'css-class' };
  78. stack.on( 'change:top', spy );
  79. stack.remove( descriptor );
  80. sinon.assert.notCalled( spy );
  81. } );
  82. it( 'should not fire when trying to remove descriptor which is not present', () => {
  83. const spy = sinon.spy();
  84. const descriptor = { priority: 10, class: 'css-class' };
  85. const secondDescriptor = { priority: 12, class: 'css-class' };
  86. stack.add( descriptor );
  87. stack.on( 'change:top', spy );
  88. stack.remove( secondDescriptor );
  89. sinon.assert.notCalled( spy );
  90. } );
  91. it( 'should fire event when last element from stack was removed', () => {
  92. const spy = sinon.spy();
  93. const descriptor = { priority: 10, class: 'css-class' };
  94. stack.add( descriptor );
  95. stack.on( 'change:top', spy );
  96. stack.remove( descriptor );
  97. sinon.assert.calledOnce( spy );
  98. expect( spy.firstCall.args[ 1 ].newDescriptor ).to.be.undefined;
  99. expect( spy.firstCall.args[ 1 ].oldDescriptor ).to.equal( descriptor );
  100. } );
  101. it( 'should not fire event when new top descriptor is same as previous', () => {
  102. const spy = sinon.spy();
  103. const descriptor = { priority: 10, class: 'css-class' };
  104. const secondDescriptor = { priority: 10, class: 'css-class' };
  105. stack.add( descriptor );
  106. stack.add( secondDescriptor );
  107. stack.on( 'change:top', spy );
  108. stack.remove( secondDescriptor );
  109. sinon.assert.notCalled( spy );
  110. } );
  111. it( 'should sort by class when priorities are the same', () => {
  112. const spy = sinon.spy();
  113. const descriptorA = { priority: 10, class: 'css-a' };
  114. const descriptorB = { priority: 10, class: 'css-b' };
  115. const descriptorC = { priority: 10, class: 'css-c' };
  116. stack.on( 'change:top', spy );
  117. stack.add( descriptorB );
  118. stack.add( descriptorA );
  119. stack.add( descriptorC );
  120. sinon.assert.calledTwice( spy );
  121. expect( spy.firstCall.args[ 1 ].newDescriptor ).to.equal( descriptorB );
  122. expect( spy.firstCall.args[ 1 ].oldDescriptor ).to.be.undefined;
  123. expect( spy.secondCall.args[ 1 ].newDescriptor ).to.equal( descriptorC );
  124. expect( spy.secondCall.args[ 1 ].oldDescriptor ).to.equal( descriptorB );
  125. } );
  126. } );