Add message history to TreeNode

backend/src/Model/spec/RingBuffer.spec.ts

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+import { RingBuffer } from '../'
+import { expect } from 'chai'
+import 'mocha'
+
+describe('RingBuffer', () => {
+  it('should add a new value', () => {
+    const b = new RingBuffer(30)
+    b.add('hello')
+    expect(b.toArray()[0]).to.eq('hello')
+  })
+
+  it('should add a new value after the first', () => {
+    const b = new RingBuffer(30)
+    b.add('hello')
+    b.add('world')
+    expect(b.toArray()[1]).to.eq('world')
+  })
+
+  it('should remove old values if buffer size is reached', () => {
+    const b = new RingBuffer(6)
+    b.add('hello')
+    b.add('world')
+    expect(b.toArray()[0]).to.eq('world')
+  })
+
+  it('items bigger then the buffer should be stored anyway', () => {
+    const b = new RingBuffer(3)
+    b.add('hello')
+    expect(b.toArray()[0]).to.eq('hello')
+    b.add('world')
+    expect(b.toArray()[0]).to.eq('world')
+  })
+
+  it('max item count should be respected', () => {
+    const b = new RingBuffer(100, 3)
+    b.add('a')
+    b.add('b')
+    b.add('c')
+    b.add('d')
+    b.add('e')
+    expect(b.toArray().length).to.eq(3)
+    expect(b.toArray()[0]).to.eq('c')
+    expect(b.toArray()[1]).to.eq('d')
+    expect(b.toArray()[2]).to.eq('e')
+  })
+})