Add testcases

Author: khairalanam

L-B/0020 NthFibonacciNumberO(1)/test.js

@@ -0,0 +1,13 @@
+const { strict: assert } = require("assert");
+const NthFibonacciNumber = require("./NthFibonacciNumberO(1)");
+
+assert.equal(NthFibonacciNumber(0), 0);
+assert.equal(NthFibonacciNumber(1), 1);
+assert.equal(NthFibonacciNumber(2), 1);
+assert.equal(NthFibonacciNumber(3), 2);
+assert.equal(NthFibonacciNumber(6), 8);
+assert.equal(NthFibonacciNumber(10), 55);
+assert.equal(NthFibonacciNumber(30), 832040);
+assert.equal(NthFibonacciNumber(50), 12586269025);
+
+console.log("All testcases completed successfully");