flow like the river

VISUALIZACION/node_modules/ngraph.graph/test/construction.js

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+var test = require('tap').test,
+  createGraph = require('..');
+
+test('add node adds node', function(t) {
+  var graph = createGraph();
+  var customData = '31337';
+
+  var node = graph.addNode(1, customData);
+
+  t.equal(graph.getNodesCount(), 1, 'exactly one node');
+  t.equal(graph.getLinksCount(), 0, 'no links');
+  t.equal(graph.getNode(1), node, 'invalid node returned by addNode (or getNode)');
+  t.equal(node.data, customData, 'data was not set properly');
+  t.equal(node.id, 1, 'node id was not set properly');
+  t.end();
+});
+
+test('hasNode checks node', function(t) {
+  var graph = createGraph();
+
+  graph.addNode(1);
+
+  t.ok(graph.hasNode(1), 'node is there');
+  t.notOk(graph.hasNode(2), 'should not be here');
+  t.end();
+});
+
+test('hasLink checks links', function (t) {
+  var graph = createGraph();
+  graph.addLink(1, 2);
+  var link12 = graph.hasLink(1, 2);
+  t.ok(link12.fromId === 1 && link12.toId === 2, 'link is found');
+
+  // this is somewhat doubtful... has link will return null, but forEachLinkedNode
+  // will actually iterate over this link. Not sure how to have consistency here
+  // for now documenting behavior in the test:
+  var noLink = graph.hasLink(2, 1);
+  t.notOk(noLink, 'hasLink is always directional');
+
+  var obviousNo = graph.hasLink();
+  t.notOk(obviousNo, 'No links there');
+  t.end();
+});
+
+test('hasLink is the same as getLink', function (t) {
+  var graph = createGraph();
+
+  t.equal(graph.getLink, graph.hasLink, 'hasLink is synonym for getLink');
+  t.end();
+});
+
+test('it considers uniqueLinkId as multigraph', function (t) {
+  var options = {uniqueLinkId: true};
+  createGraph(options);
+  t.equal(options.multigraph, true, 'multigraph is set');
+  t.end();
+});
+
+test('it throw if no node id is passed', function(t) {
+  var graph = createGraph();
+  t.throws(function() {
+    graph.addNode(); // no id, should throw
+  }, 'It throws on undefined node');
+
+  t.end();
+});
+
+test('it fires update event when node is updated', function(t) {
+  t.plan(3);
+  var graph = createGraph();
+  graph.addNode(1, 'hello');
+  graph.on('changed', checkChangedEvent);
+  graph.addNode(1, 'world');
+
+  t.end();
+
+  function checkChangedEvent(changes) {
+    var change = changes[0];
+    t.equal(change.node.id, 1);
+    t.equal(change.node.data, 'world');
+    t.equal(change.changeType, 'update');
+  }
+});
+
+test('it can add node with id similar to reserved prototype property', function(t) {
+  var graph = createGraph();
+  graph.addNode('constructor');
+  graph.addLink('watch', 'constructor');
+
+  var iterated = 0;
+  graph.forEachNode(function() {
+    iterated += 1;
+  });
+
+  t.ok(graph.hasLink('watch', 'constructor'));
+  t.equal(graph.getLinksCount(), 1, 'one link');
+  t.equal(iterated, 2, 'has two nodes');
+  t.end();
+});
+
+test('add link adds link', function(t) {
+  var graph = createGraph();
+
+  var link = graph.addLink(1, 2),
+    firstNodeLinks = graph.getLinks(1),
+    secondNodeLinks = graph.getLinks(2);
+
+  t.equal(graph.getNodesCount(), 2, 'Two nodes');
+  t.equal(graph.getLinksCount(), 1, 'One link');
+  t.equal(firstNodeLinks.size, 1, 'number of links of the first node is wrong');
+  t.equal(secondNodeLinks.size, 1, 'number of links of the second node is wrong');
+  t.equal(link, Array.from(firstNodeLinks)[0], 'invalid link in the first node');
+  t.equal(link, Array.from(secondNodeLinks)[0], 'invalid link in the second node');
+  t.end();
+});
+
+test('it can add multi-edges', function (t) {
+  t.plan(5);
+  var graph = createGraph({multigraph: true});
+  graph.addLink(1, 2, 'first');
+  graph.addLink(1, 2, 'second');
+  graph.addLink(1, 2, 'third');
+
+  t.equal(graph.getLinksCount(), 3, 'three links!');
+  t.equal(graph.getNodesCount(), 2, 'Two nodes');
+
+  graph.forEachLinkedNode(1, function (otherNode, link) {
+    t.ok(link.data === 'first' || link.data === 'second' || link.data === 'third', 'Link is here');
+  });
+
+  t.end();
+});
+
+test('it can produce unique link ids', function (t) {
+  // eslint-disable-next-line no-shadow
+  t.test('by default links are de-duped', function (t) {
+    var seen = {};
+    var graph = createGraph();
+    graph.addLink(1, 2, 'first');
+    graph.addLink(1, 2, 'second');
+    graph.addLink(1, 2, 'third');
+    graph.forEachLink(verifyLinksAreNotUnique);
+
+    var link = graph.getLink(1, 2);
+    t.equal(seen[link.id], 1, 'Link 1->2 seen 1 time');
+    t.equal(link.data, 'third', 'Last link wins');
+
+    // eslint-disable-next-line no-shadow
+    function verifyLinksAreNotUnique(link) {
+      seen[link.id] = (seen[link.id] || 0) + 1;
+    }
+    t.end();
+  });
+
+  // eslint-disable-next-line no-shadow
+  t.test('You can create multigraph', function (t) {
+    var graph = createGraph({
+      multigraph: true
+    });
+
+    var seen = {};
+    graph.addLink(1, 2, 'first');
+    graph.addLink(1, 2, 'second');
+    graph.addLink(1, 2, 'third');
+    graph.forEachLink(verifyLinkIsUnique);
+    t.equal(graph.getLinksCount(), 3, 'All three links are here');
+    t.end();
+
+    function verifyLinkIsUnique(link) {
+      t.notOk(seen[link.id], link.id + ' is unique');
+      seen[link.id] = true;
+    }
+  });
+
+  t.end();
+});
+
+test('add one node fires changed event', function(t) {
+  t.plan(3);
+  var graph = createGraph();
+  var testNodeId = 'hello world';
+
+  graph.on('changed', function(changes) {
+    t.ok(changes && changes.length === 1, "Only one change should be recorded");
+    t.equal(changes[0].node.id, testNodeId, "Wrong node change notification");
+    t.equal(changes[0].changeType, 'add', "Add change type expected.");
+  });
+
+  graph.addNode(testNodeId);
+
+  t.end();
+});
+
+test('add link fires changed event', function(t) {
+  t.plan(4);
+  var graph = createGraph();
+  var fromId = 1,
+    toId = 2;
+
+  graph.on('changed', function(changes) {
+    t.ok(changes && changes.length === 3, "Three change should be recorded: node, node and link");
+    t.equal(changes[2].link.fromId, fromId, "Wrong link from Id");
+    t.equal(changes[2].link.toId, toId, "Wrong link toId");
+    t.equal(changes[2].changeType, 'add', "Add change type expected.");
+  });
+
+  graph.addLink(fromId, toId);
+  t.end();
+});
+
+test('remove isolated node remove it', function(t) {
+  var graph = createGraph();
+
+  graph.addNode(1);
+  graph.removeNode(1);
+
+  t.equal(graph.getNodesCount(), 0, 'Remove operation failed');
+  t.end();
+});
+
+test('supports plural methods', function(t) {
+  var graph = createGraph();
+
+  graph.addLink(1, 2);
+
+  t.equal(graph.getNodeCount(), 2, 'two nodes are there');
+  t.equal(graph.getLinkCount(), 1, 'two nodes are there');
+
+  t.equal(graph.getNodesCount(), 2, 'two nodes are there');
+  t.equal(graph.getLinksCount(), 1, 'two nodes are there');
+
+  t.end();
+});
+
+test('remove link removes it', function(t) {
+  t.plan(5);
+
+  var graph = createGraph();
+  var link = graph.addLink(1, 2);
+
+  var linkIsRemoved = graph.removeLink(link);
+
+  t.equal(graph.getNodesCount(), 2, 'remove link should not remove nodes');
+  t.equal(graph.getLinksCount(), 0, 'No Links');
+  t.equal(graph.getLinks(1).size, 0, 'link should be removed from the first node');
+  t.equal(graph.getLinks(2).size, 0, 'link should be removed from the second node');
+  t.ok(linkIsRemoved, 'Link removal is successful');
+
+  graph.forEachLink(function() {
+    test.ok(false, 'No links should be in graph');
+  });
+
+  t.end();
+});
+
+test('it can remove link by from/to ids', function(t) {
+  var graph = createGraph();
+  graph.addLink(1, 2);
+
+  var linkIsRemoved = graph.removeLink(1, 2);
+
+  t.equal(graph.getNodesCount(), 2, 'remove link should not remove nodes');
+  t.equal(graph.getLinksCount(), 0, 'No Links');
+  t.equal(graph.getLinks(1).size, 0, 'link should be removed from the first node');
+  t.equal(graph.getLinks(2).size, 0, 'link should be removed from the second node');
+  t.ok(linkIsRemoved, 'Link removal is successful');
+
+  graph.forEachLink(function() {
+    test.ok(false, 'No links should be in graph');
+  });
+
+  t.end();
+});
+
+test('remove link returns false if no link removed', function (t) {
+  var graph = createGraph();
+
+  graph.addLink(1, 2);
+  var result = graph.removeLink('blah');
+  t.notOk(result, 'Link is not removed');
+
+  var alsoNo = graph.removeLink();
+  t.notOk(alsoNo, 'No link - no removal');
+  t.end();
+});
+
+test('remove isolated node fires changed event', function(t) {
+  t.plan(4);
+  var graph = createGraph();
+  graph.addNode(1);
+
+  graph.on('changed', function(changes) {
+    t.ok(changes && changes.length === 1, "One change should be recorded: node removed");
+    t.equal(changes[0].node.id, 1, "Wrong node Id");
+    t.equal(changes[0].changeType, 'remove', "'remove' change type expected.");
+  });
+
+  var result = graph.removeNode(1);
+  t.ok(result, 'node is removed');
+  t.end();
+});
+
+test('remove link fires changed event', function(t) {
+  t.plan(3);
+  var graph = createGraph();
+  var link = graph.addLink(1, 2);
+
+  graph.on('changed', function(changes) {
+    t.ok(changes && changes.length === 1, "One change should be recorded: link removed");
+    t.equal(changes[0].link, link, "Wrong link removed");
+    t.equal(changes[0].changeType, 'remove', "'remove' change type expected.");
+  });
+
+  graph.removeLink(link);
+  t.end();
+});
+
+test('remove linked node fires changed event', function(t) {
+  t.plan(5);
+  var graph = createGraph(),
+    link = graph.addLink(1, 2),
+    nodeIdToRemove = 1;
+
+  graph.on('changed', function(changes) {
+    t.ok(changes && changes.length === 2, "Two changes should be recorded: link and node removed");
+    t.equal(changes[0].link, link, "Wrong link removed");
+    t.equal(changes[0].changeType, 'remove', "'remove' change type expected.");
+    t.equal(changes[1].node.id, nodeIdToRemove, "Wrong node removed");
+    t.equal(changes[1].changeType, 'remove', "'remove' change type expected.");
+  });
+
+  graph.removeNode(nodeIdToRemove);
+  t.end();
+});
+
+test('remove node with many links removes them all', function(t) {
+  var graph = createGraph();
+  graph.addLink(1, 2);
+  graph.addLink(1, 3);
+
+  graph.removeNode(1);
+
+  t.equal(graph.getNodesCount(), 2, 'remove link should remove one node only');
+  t.equal(graph.getLinks(1), null, 'link should be removed from the first node');
+  t.equal(graph.getLinks(2).size, 0, 'link should be removed from the second node');
+  t.equal(graph.getLinks(3).size, 0, 'link should be removed from the third node');
+  graph.forEachLink(function() {
+    test.ok(false, 'No links should be in graph');
+  });
+
+  t.end();
+});
+
+test('remove node returns false when no node removed', function (t) {
+  var graph = createGraph();
+  graph.addNode('hello');
+  var result = graph.removeNode('blah');
+  t.notOk(result, 'No "blah" node');
+  t.end();
+});
+
+test('clearGraph clears graph', function (t) {
+  var graph = createGraph();
+  graph.addNode('hello');
+  graph.addLink(1, 2);
+  graph.clear();
+
+  t.equal(graph.getNodesCount(), 0, 'No nodes');
+  t.equal(graph.getLinksCount(), 0, 'No links');
+  t.end();
+});
+
+test('beginUpdate holds events', function(t) {
+  var graph = createGraph();
+  var changedCount = 0;
+  graph.on('changed', function () {
+    changedCount += 1;
+  });
+  graph.beginUpdate();
+  graph.addNode(1);
+  t.equal(changedCount, 0, 'Begin update freezes updates until `endUpdate()`');
+  graph.endUpdate();
+  t.equal(changedCount, 1, 'event is fired only after endUpdate()');
+  t.end();
+});