Commit 43ed1bc

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Merge pull request #111 from theIYD/master

Add Test for Binary Tree Preorder Traversal

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	`1`	`+const BinaryTree = require("./index");`
	`2`	`+`
	`3`	`+describe("Binary Tree Preorder Traversal", () => {`
	`4`	`+ let btree;`
	`5`	`+ let preOrderTraversal;`
	`6`	`+`
	`7`	`+ describe("Creates BTree", () => {`
	`8`	`+ btree = new BinaryTree([1, 2, 3, 4, 5, 6]);`
	`9`	`+ });`
	`10`	`+`
	`11`	`+ describe("BTree Traversals", () => {`
	`12`	`+ it("should compute the Preorder traversal for the above created binary tree", () => {`
	`13`	`+ preOrderTraversal = btree.preOrder();`
	`14`	`+ expect(preOrderTraversal).toEqual([1, 2, 4, 5, 3, 6]);`
	`15`	`+ });`
	`16`	`+ });`
	`17`	`+});`

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