Add an algorithm to find Taylor series approximation of exponential f… (#1160)

Maths/test/ExponentialFunction.test.js

@@ -0,0 +1,16 @@
+import { exponentialFunction } from '../ExponentialFunction'
+
+describe('Tests for exponential function', () => {
+  it('should be a function', () => {
+    expect(typeof exponentialFunction).toEqual('function')
+  })
+
+  it('should throw error for invalid input', () => {
+    expect(() => exponentialFunction(2, -34)).toThrow()
+  })
+
+  it('should return the exponential function of power of 5 and order of 21', () => {
+    const ex = exponentialFunction(5, 20)
+    expect(ex).toBe(148.4131078683383)
+  })
+})