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Refactor CreateBinaryTreeFromInorderPreorder (#4190)

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Albina Gimaletdinova
2023-05-14 14:52:30 +03:00
committed by GitHub
parent 0255705388
commit deef2ae445
2 changed files with 157 additions and 85 deletions
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103
src/test/java/com/thealgorithms/datastructures/trees/CreateBinaryTreeFromInorderPreorderTest.java Normal file
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package com.thealgorithms.datastructures.trees;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
/**
* @author Albina Gimaletdinova on 14/05/2023
*/
public class CreateBinaryTreeFromInorderPreorderTest {
@Test
public void testOnNullArraysShouldReturnNullTree() {
// when
BinaryTree.Node root = CreateBinaryTreeFromInorderPreorder.createTree(null, null);
BinaryTree.Node rootOpt = CreateBinaryTreeFromInorderPreorder.createTreeOptimized(null, null);
// then
Assertions.assertNull(root);
Assertions.assertNull(rootOpt);
}
@Test
public void testOnEmptyArraysShouldCreateNullTree() {
// given
Integer[] preorder = {};
Integer[] inorder = {};
// when
BinaryTree.Node root = CreateBinaryTreeFromInorderPreorder.createTree(preorder, inorder);
BinaryTree.Node rootOpt = CreateBinaryTreeFromInorderPreorder.createTreeOptimized(preorder, inorder);
// then
Assertions.assertNull(root);
Assertions.assertNull(rootOpt);
}
@Test
public void testOnSingleNodeTreeShouldCreateCorrectTree() {
// given
Integer[] preorder = {1};
Integer[] inorder = {1};
// when
BinaryTree.Node root = CreateBinaryTreeFromInorderPreorder.createTree(preorder, inorder);
BinaryTree.Node rootOpt = CreateBinaryTreeFromInorderPreorder.createTreeOptimized(preorder, inorder);
// then
checkTree(preorder, inorder, root);
checkTree(preorder, inorder, rootOpt);
}
@Test
public void testOnRightSkewedTreeShouldCreateCorrectTree() {
// given
Integer[] preorder = {1, 2, 3, 4};
Integer[] inorder = {1, 2, 3, 4};
// when
BinaryTree.Node root = CreateBinaryTreeFromInorderPreorder.createTree(preorder, inorder);
BinaryTree.Node rootOpt = CreateBinaryTreeFromInorderPreorder.createTreeOptimized(preorder, inorder);
// then
checkTree(preorder, inorder, root);
checkTree(preorder, inorder, rootOpt);
}
@Test
public void testOnLeftSkewedTreeShouldCreateCorrectTree() {
// given
Integer[] preorder = {1, 2, 3, 4};
Integer[] inorder = {4, 3, 2, 1};
// when
BinaryTree.Node root = CreateBinaryTreeFromInorderPreorder.createTree(preorder, inorder);
BinaryTree.Node rootOpt = CreateBinaryTreeFromInorderPreorder.createTreeOptimized(preorder, inorder);
// then
checkTree(preorder, inorder, root);
checkTree(preorder, inorder, rootOpt);
}
@Test
public void testOnNormalTreeShouldCreateCorrectTree() {
// given
Integer[] preorder = {3, 9, 20, 15, 7};
Integer[] inorder = {9, 3, 15, 20, 7};
// when
BinaryTree.Node root = CreateBinaryTreeFromInorderPreorder.createTree(preorder, inorder);
BinaryTree.Node rootOpt = CreateBinaryTreeFromInorderPreorder.createTreeOptimized(preorder, inorder);
// then
checkTree(preorder, inorder, root);
checkTree(preorder, inorder, rootOpt);
}
private static void checkTree(Integer[] preorder, Integer[] inorder, BinaryTree.Node root) {
Assertions.assertNotNull(root);
Assertions.assertEquals(PreOrderTraversal.iterativePreOrder(root), Arrays.asList(preorder));
Assertions.assertEquals(InorderTraversal.iterativeInorder(root), Arrays.asList(inorder));
}
}