merge: Add TribonacciNumber in dp (#839)

Dynamic-Programming/tests/TribonacciNumber.test.js

@@ -0,0 +1,23 @@
+import { tribonacci } from '../TribonacciNumber'
+
+describe('TribonacciNumber', () => {
+  it('tribonacci of 0', () => {
+    expect(tribonacci(0)).toBe(0)
+  })
+
+  it('tribonacci of 1', () => {
+    expect(tribonacci(1)).toBe(1)
+  })
+
+  it('tribonacci of 2', () => {
+    expect(tribonacci(2)).toBe(1)
+  })
+
+  it('tribonacci of 10', () => {
+    expect(tribonacci(10)).toBe(149)
+  })
+
+  it('tribonacci of 25', () => {
+    expect(tribonacci(25)).toBe(1389537)
+  })
+})