Add electron

backend/src/Model/spec/Edge.spec.ts

@@ -0,0 +1,31 @@
+import { Edge, TreeNode } from '../'
+import { expect } from 'chai';
+import 'mocha';
+
+describe('Edge', () => {
+
+  it('should contain a name', () => {
+      let e = new Edge('foo')
+      expect(e.name).to.equal('foo')
+  });
+
+  it('hash should not be empty', () => {
+      let e = new Edge('bar')
+      expect(e.hash().length).to.be.gt(0)
+  });
+
+  it('hash should be stable', () => {
+      let e = new Edge('bar')
+      let previousHash = e.hash()
+      expect(e.hash()).to.eq(previousHash)
+  });
+
+  it('hash should change when parent is present', () => {
+      let foo = new Edge('foo')
+      let bar = new Edge('bar')
+
+      var previousHash = bar.hash()
+      bar.source = new TreeNode(foo, undefined)
+      expect(bar.hash()).to.not.eq(previousHash)
+  });
+});