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unitTest.js
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unitTest.js
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const VirtualText = require('virtual-dom/vnode/vtext');
const VirtualNode = require('virtual-dom/vnode/vnode');
const VPATCH = require('virtual-dom/vnode/vpatch');
const HtmlRenderedDiff = require('./index');
describe('Unit Test', function() {
/** Test helper methods **/
describe('findNode', function() {
it('should return false when either parameter are falsy', function() {
expect(HtmlRenderedDiff._findNode(null, null)).toBeFalsy();
expect(HtmlRenderedDiff._findNode(null, {})).toBeFalsy();
expect(HtmlRenderedDiff._findNode({}, null)).toBeFalsy();
});
it('should return false when sourceNode is a Text Node', function() {
expect(HtmlRenderedDiff._findNode({}, new VirtualText('hello'))).toBeFalsy();
});
it('should return false when nodeToFind is neither a VirtualNode nor a VirtualText', function() {
expect(HtmlRenderedDiff._findNode({}, new VirtualNode('yo', {}, []))).toBeFalsy();
});
it('should return false when it can not find the node', function() {
// simple case
let nodeToFind = new VirtualText('find me');
let sourceNode = new VirtualNode('h1', {}, []);
expect(HtmlRenderedDiff._findNode(nodeToFind, sourceNode)).toBeFalsy();
// complicated case
sourceNode = new VirtualNode('h1', {}, [new VirtualText('1'), new VirtualNode('h1', {}, [new VirtualText('2'), new VirtualNode('h3', {}, [])])]);
expect((HtmlRenderedDiff._findNode(nodeToFind, sourceNode))).toBeFalsy();
});
it('should return an object {foundIn: reference to array where the node was found in, at: the index the node is at}', function() {
let nodeToFind = new VirtualText('Find me');
let children = [nodeToFind];
let sourceNode = new VirtualNode('h1', {}, children);
let result = HtmlRenderedDiff._findNode(nodeToFind, sourceNode);
expect(result.at).toEqual(0);
expect(result.foundIn).toEqual(children);
// suppose that nodeToFind is at another index
children.unshift(new VirtualText('dummy node'));
result = HtmlRenderedDiff._findNode(nodeToFind, sourceNode);
expect(result.at).toEqual(1);
expect(result.foundIn).toEqual(children);
// suppose that nodeToFind is deep inside sourceNode
sourceNode = new VirtualNode('h1', {}, [new VirtualText('sibling'), new VirtualNode('p', {}, children)]);
result = HtmlRenderedDiff._findNode(nodeToFind, sourceNode);
expect(result.at).toEqual(1);
expect(result.foundIn).toEqual(children);
// suppose that nodeToFind is a VirtualNode instead of VirtualText
nodeToFind = new VirtualNode('h2', {}, []);
children.push(nodeToFind);
result = HtmlRenderedDiff._findNode(nodeToFind, sourceNode);
expect(result.at).toEqual(2);
expect(result.foundIn).toEqual(children);
});
});
describe('deepCopyProperties', function() {
it('should return false if either parameter is falsy', function() {
let fromHere;
let toHere;
expect(HtmlRenderedDiff._deepCopyProperties(fromHere, toHere)).toBeFalsy();
toHere = {};
expect(HtmlRenderedDiff._deepCopyProperties(fromHere, toHere)).toBeFalsy();
toHere = undefined;
fromHere = {};
expect(HtmlRenderedDiff._deepCopyProperties(fromHere, toHere)).toBeFalsy();
});
it('should return true and copy properties correctly', function() {
let fromHere = {
style: 'cool',
src: 'srcUrl',
attributes: {
class: "classA",
value: 'hello',
inner: {
nested: 'wow'
}
}
};
let toHere = {};
let result = HtmlRenderedDiff._deepCopyProperties(fromHere, toHere);
expect(result).toBeTruthy();
expect(toHere.style).toEqual(fromHere.style);
expect(toHere.src).toEqual(fromHere.src);
expect(toHere.attributes.class).toEqual(fromHere.attributes.class);
expect(toHere.attributes.value).toEqual(fromHere.attributes.value);
expect(toHere.attributes.inner.nested).toEqual(fromHere.attributes.inner.nested);
});
});
describe('containsAllowedProps', function() {
it('should return false if the parameter is not an object', function() {
expect(HtmlRenderedDiff._containsAllowedProps(null)).toBeFalsy();
});
it('should return false if the parameter is an object containing none of the properties we care about (style, src, href, class)', function() {
expect(HtmlRenderedDiff._containsAllowedProps({})).toBeFalsy();
});
it('should return true if the parameter is an object containing at least one of properties we care about (style, src, href, class)', function() {
expect(HtmlRenderedDiff._containsAllowedProps({style: 'display: none'})).toBeTruthy();
expect(HtmlRenderedDiff._containsAllowedProps({src: 'url'})).toBeTruthy();
expect(HtmlRenderedDiff._containsAllowedProps({href: 'link'})).toBeTruthy();
expect(HtmlRenderedDiff._containsAllowedProps({attributes: {class: 'hello'}})).toBeTruthy();
});
});
describe('hasFurtherChanges', function() {
it('should return true if the parameter is not a VirtualNode', function() {
expect(HtmlRenderedDiff._hasFurtherChanges({}, [])).toBeFalsy();
});
it('should return true if the parameter node has no children', function() {
expect(HtmlRenderedDiff._hasFurtherChanges(new VirtualNode('b', {}, [])), []).toBeFalsy();
});
it('should return true if the parameter node descendants are not affected by any patches', function() {
expect(HtmlRenderedDiff._hasFurtherChanges(new VirtualNode('b', {}, [new VirtualNode('e', {}, [])]), [{key: 0, vNode: new VirtualNode('e', {}, [])}])).toBeFalsy();
});
it('should return false if the any of the node descendant is affected by other patches', function() {
// simple case
let child = new VirtualText('hi');
let nodeToPatch = new VirtualNode('c', {}, [child]);
let allNodesRequiredPatch = [child];
expect(HtmlRenderedDiff._hasFurtherChanges(nodeToPatch, allNodesRequiredPatch)).toBeTruthy();
// complicated case
nodeToPatch = new VirtualNode('a', {}, [new VirtualNode('a', {}, [new VirtualNode('e', {}, [child]), new VirtualText('sdf')]), new VirtualText('z')]);
expect(HtmlRenderedDiff._hasFurtherChanges(nodeToPatch, allNodesRequiredPatch)).toBeTruthy();
});
});
describe('getNodesNeedPatching', function() {
it('should return an array of nodes that needs patches', function() {
let nodeNeedPatching1 = new VirtualText('node to patch');
let nodeNeedPatching2 = new VirtualNode('p', {}, []);
let nodeNeedPatching3 = new VirtualNode('div', {}, []);
let patches = [
{
type: VPATCH.VNODE,
vNode: nodeNeedPatching1,
patch: new VirtualNode('p', {}, [])
},
// there are cases where the value is an array( Properties Patch followed immediately by an insertion patch
{
type: VPATCH.PROPS,
vNode: nodeNeedPatching2,
patch: new VirtualNode('p', {'src': 'new src url'}, [])
},
{
type: VPATCH.INSERT,
vNode: nodeNeedPatching3,
patch: new VirtualText('insert me')
}];
let result = HtmlRenderedDiff._getNodesNeedPatching(patches);
expect(result.length === 3).toBeTruthy();
expect(result[0]).toEqual(nodeNeedPatching1);
expect(result[1]).toEqual(nodeNeedPatching2);
expect(result[2]).toEqual(nodeNeedPatching3);
});
});
/** Test applyPatch methods **/
describe('applyVNodePatch', function() {
it('the patch is done later down the tree', function() {
let nodeToAdd = new VirtualNode('p', {}, []);
let nodeToRemove = new VirtualText('div', {}, []);
let patch = {
vNode: nodeToRemove,
patch: nodeToAdd
};
let originalTree = new VirtualNode('p', {}, [nodeToRemove]);
HtmlRenderedDiff._applyVNodePatch(patch, originalTree);
expect(originalTree.children[0].properties.attributes.class).toEqual('patcher-replaceOut');
expect(originalTree.children[0].children[0]).toEqual(nodeToRemove);
expect(originalTree.children[1].properties.attributes.class).toEqual('patcher-replaceIn');
expect(originalTree.children[1].children[0]).toEqual(nodeToAdd);
});
});
describe('applyVTextPatch', function() {
it('case1: the patch is done for VTEXT against VNODE', function() {
let nodeToAdd = new VirtualText('add me');
let nodeToRemove = new VirtualNode('p', {}, []);
let originalTree = new VirtualNode('div', {}, [nodeToRemove]);
let patch = {
vNode: nodeToRemove,
patch: nodeToAdd
};
HtmlRenderedDiff._applyVTextPatch(patch, originalTree);
expect(originalTree.children[0].properties.attributes.class).toEqual('patcher-replaceOut');
expect(originalTree.children[0].children[0]).toEqual(nodeToRemove);
expect(originalTree.children[1].properties.attributes.class).toEqual('patcher-replaceIn');
expect(originalTree.children[1].children[0]).toEqual(nodeToAdd);
});
it('case2: the patch is done for VTEXT against VTEXT ( text-diff )', function() {
let nodeToAdd = new VirtualText('apple juice');
let nodeToRemove = new VirtualText('apple cake');
let originalTree = new VirtualNode('div', {}, [nodeToRemove]);
let patch = {
vNode: nodeToRemove,
patch: nodeToAdd
};
HtmlRenderedDiff._applyVTextPatch(patch, originalTree);
expect(originalTree.children[0].properties.attributes.class).toEqual('patcher-text-diff');
// for each text diff, there should be a wrapper on top of it
let textDiffResult = originalTree.children[0].children;
expect(textDiffResult[0].properties.attributes.class).toEqual('patcher-text-same');
expect(textDiffResult[0].children[0].text).toEqual('apple ');
expect(textDiffResult[1].children[0].text).toEqual('cake');
expect(textDiffResult[2].children[0].text).toEqual('juice');
});
});
describe('applyInsertPatch', function() {
it('should not wrap nodeToInsert since it is a VirutalNode', function() {
let nodeToInsert = new VirtualNode('p', {src: 'hi', attributes: {class:'hi'}}, []);
let originalTree = new VirtualNode('div', {}, []);
let patch = {
patch: nodeToInsert,
vNode: originalTree
};
HtmlRenderedDiff._applyInsertPatch(patch);
expect(nodeToInsert.properties.src).toEqual('hi');
expect(nodeToInsert.properties.attributes.class).toEqual('hi patcher-insert');
});
});
describe('applyRemovePatch', function() {
it('should delete node at the right place', function() {
let nodeToDelete = new VirtualText('delete me');
let patch = {
vNode: nodeToDelete
};
let originalTree = new VirtualNode('h2', {}, [nodeToDelete]);
HtmlRenderedDiff._applyRemovePatch(patch, originalTree);
expect(originalTree.children[0].properties.attributes.class).toEqual('patcher-delete');
expect(originalTree.children[0].children[0]).toEqual(nodeToDelete);
});
});
describe('applyVPropsPatch', function() {
it('should not wrap this node when at least one of its children is affected by other patches ( but do patch the override the properties', function() {
let nodeToPatchChild = new VirtualText('hi');
let nodeToPatch = new VirtualNode('p', {src: 'original src', attributes: {class: 'old class name'}}, [nodeToPatchChild]);
let originalTree = new VirtualNode('div', {}, [nodeToPatch]);
let allNodeRequiredToPatch = [nodeToPatch, nodeToPatchChild];
let patch = {
vNode: nodeToPatch,
patch: {
src: 'new src' ,
attributes: {class: 'new class name'}
}
};
HtmlRenderedDiff._applyVPropsPatch(patch, originalTree, allNodeRequiredToPatch);
expect(originalTree.children[0]).toEqual(nodeToPatch);
expect(nodeToPatch.properties['src']).toEqual('new src');
expect(nodeToPatch.properties.attributes.class).toEqual('new class name');
});
it('should wrap this node when none of its children are affected by other patches', function() {
let nodeToPatchChild = new VirtualText('hi');
let nodeToPatch = new VirtualNode('p', {src: 'original src', attributes: {class: 'old class name'}}, [nodeToPatchChild]);
let originalTree = new VirtualNode('div', {}, [nodeToPatch]);
let allNodeRequiredToPatch = [nodeToPatch];
let patch = {
vNode: nodeToPatch,
patch: {
src: 'new src' ,
attributes: {class: 'new class name'}
}
};
HtmlRenderedDiff._applyVPropsPatch(patch, originalTree, allNodeRequiredToPatch);
expect(originalTree.children[0].properties.attributes.class).toEqual('patcher-attribute-replace-out');
expect(originalTree.children[1].properties.attributes.class).toEqual('patcher-attribute-replace-in');
let nodeToPatchOriginal = originalTree.children[0].children[0];
expect(nodeToPatchOriginal.properties.src).toEqual('original src');
expect(nodeToPatchOriginal.properties.attributes.class).toEqual('old class name');
let nodeToPatchAfter = originalTree.children[1].children[0];
expect(nodeToPatchAfter).toEqual(nodeToPatch);
expect(nodeToPatchAfter.properties.src).toEqual('new src');
expect(nodeToPatchAfter.properties.attributes.class).toEqual('new class name');
});
});
});