Add test for EventDispatcher

backend/src/Model/spec/EventDispatcher.spec.ts

@@ -0,0 +1,43 @@
+import 'mocha'
+import { EventDispatcher } from '../../../../events'
+
+import { expect } from 'chai'
+import { doesNotReject } from 'assert'
+
+describe('EventDispatcher', async () => {
+  it('should dispatch', async function () {
+    const dispatcher = new EventDispatcher<string, string>('me')
+    this.timeout(300)
+
+    setTimeout(() => dispatcher.dispatch('hello'), 5)
+    const response = await new Promise((resolve) => {
+      dispatcher.subscribe((msg) => {
+        resolve(msg)
+      })
+    })
+
+    expect(response).to.eq('hello')
+  })
+
+  it('should unsubscribe', async function () {
+    const dispatcher = new EventDispatcher<string, string>('me')
+    this.timeout(300)
+    let incrementee = 0
+    const callback = (msg: any) => {
+      incrementee += 1
+    }
+
+    dispatcher.subscribe(callback)
+    dispatcher.subscribe(callback)
+    dispatcher.unsubscribe(callback)
+
+    // Should increment to 1
+    dispatcher.dispatch('hello')
+    dispatcher.unsubscribe(callback)
+
+    // should not cause any increment
+    dispatcher.dispatch('hello')
+
+    expect(incrementee).to.eq(1)
+  })
+})