Add electron

backend/src/Model/spec/TreeNodeFactory.spec.ts

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+import { Edge, TreeNode, TreeNodeFactory } from '../'
+import { expect } from 'chai';
+import 'mocha';
+
+describe('TreeNodeFactory', () => {
+  it('should create node', () => {
+    let topic = 'foo/bar'
+    let edges = topic.split('/')
+    let node = TreeNodeFactory.fromEdgesAndValue(edges, 5)
+
+    expect(node).to.not.eq(undefined)
+    expect(node.sourceEdge.name).to.eq('bar')
+    expect(node.value).to.eq(5)
+
+    if (!node.sourceEdge.source) {
+      expect.fail('should not happen')
+      return
+    }
+
+    let foo = node.sourceEdge.source.sourceEdge
+    expect(foo.name).to.eq('foo')
+  });
+
+  it('node should contain edges in order', () => {
+    let topic = 'foo/bar/baz'
+    let edges = topic.split('/')
+    let node = TreeNodeFactory.fromEdgesAndValue(edges, 5)
+
+    expect(node.value).to.eq(5)
+    expect(node.sourceEdge.name).to.eq('baz')
+
+    const barNode = node.sourceEdge.source
+    if (!barNode) {
+      expect.fail('should not fail')
+      return
+    }
+    expect(barNode.sourceEdge.name).to.eq('bar')
+
+    const fooNode = barNode.sourceEdge.source
+    if (!fooNode) {
+      expect.fail('should not fail')
+      return
+    }
+    expect(fooNode.sourceEdge.name).to.eq('foo')
+  });
+});