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Commit 72f5ba5

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authored
Merge pull request #100 from ngittlen/master
Added tests for the A* algorithm and cleaned up A* directories
2 parents 77e1f25 + a2273b7 commit 72f5ba5

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2 files changed

+135
-6
lines changed

2 files changed

+135
-6
lines changed

‎src/_PathFinder_/AStar/AStar.test.js‎

Lines changed: 122 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,122 @@
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const { AStar } = require('.');
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describe('A*', () => {
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describe('Completes grid successfully', () => {
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it('A*', () => {
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const inputGrid = [
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[1, 1, 1, 0, 0, 0],
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[1, 0, 1, 1, 1, 1],
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[1, 0, 0, 0, 0, 0],
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[1, 1, 1, 1, 1, 1],
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];
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const ROW = inputGrid.length;
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const COL = inputGrid[0].length;
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const start = {
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i: 0,
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j: 0,
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};
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const end = {
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i: 3,
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j: 5,
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};
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const completedPath = [[3, 5], [3, 4], [3, 3], [3, 2], [3, 1], [2, 0], [1, 0], [0, 0]];
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expect(AStar(start, end, ROW, COL, inputGrid)).toEqual(completedPath);
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});
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});
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describe('Completes large grid successfully', () => {
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it('A*', () => {
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const inputGrid = [
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[1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1],
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[1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1],
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[1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1],
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[1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
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[1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1],
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[0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1],
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[0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0],
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[0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0],
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[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1],
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];
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const ROW = inputGrid.length;
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const COL = inputGrid[0].length;
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const start = {
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i: 0,
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j: 0,
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};
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const end = {
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i: 8,
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j: 11,
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};
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const completedPath = [[8, 11], [8, 10], [7, 9], [6, 8], [5, 9], [5, 10],
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[4, 11], [3, 11], [2, 11], [1, 11], [0, 10], [1, 9], [0, 8], [1, 7],
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[1, 6], [2, 5], [2, 4], [2, 3], [2, 2], [2, 1], [1, 0], [0, 0]];
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expect(AStar(start, end, ROW, COL, inputGrid)).toEqual(completedPath);
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});
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});
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describe('Cannot complete grid successfully', () => {
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it('A*', () => {
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const inputGrid = [
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[1, 1, 1, 0, 0, 0],
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[0, 0, 0, 0, 0, 0],
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[1, 0, 0, 0, 0, 0],
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[1, 1, 1, 1, 1, 1],
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];
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const ROW = inputGrid.length;
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const COL = inputGrid[0].length;
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const start = {
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i: 0,
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j: 0,
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};
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const end = {
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i: 3,
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j: 5,
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};
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expect(() => { AStar(start, end, ROW, COL, inputGrid); }).toThrowError('Error: Endpoint cannot be reached');
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});
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});
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describe('Endpoint out of grid bounds', () => {
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it('A*', () => {
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const inputGrid = [
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[1, 1, 1, 0, 0, 0],
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[0, 0, 0, 0, 0, 0],
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[1, 0, 0, 0, 0, 0],
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[1, 1, 1, 1, 1, 1],
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];
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const ROW = inputGrid.length;
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const COL = inputGrid[0].length;
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const start = {
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i: 0,
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j: 0,
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};
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const end = {
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i: 5,
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j: 5,
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};
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expect(() => { AStar(start, end, ROW, COL, inputGrid); }).toThrowError('Error: Endpoint outside grid bounds');
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});
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});
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describe('Endpoint value is zero', () => {
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it('A*', () => {
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const inputGrid = [
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[1, 1, 1, 0, 0, 0],
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[0, 0, 0, 0, 0, 0],
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[1, 0, 0, 0, 0, 0],
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[1, 1, 1, 1, 1, 1],
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];
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const ROW = inputGrid.length;
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const COL = inputGrid[0].length;
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const start = {
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i: 0,
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j: 0,
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};
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const end = {
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i: 1,
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j: 3,
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};
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expect(() => { AStar(start, end, ROW, COL, inputGrid); }).toThrowError('Error: Endpoint is unreachable');
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});
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});
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});

‎src/PathFinder/AStart/index.js‎ renamed to ‎src/_PathFinder_/AStar/index.js‎

Lines changed: 13 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -9,6 +9,15 @@ function AStar(s, e, row, col, inputGrid) {
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const Col = col;
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const start = s;
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const end = e;
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const path = [];
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if (end.i >= inputGrid.length || end.j >= inputGrid[0].length) {
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throw new Error('Error: Endpoint outside grid bounds');
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}
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if (inputGrid[end.i][end.j] === 0) {
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throw new Error('Error: Endpoint is unreachable');
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}
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1322
function cell() {
1423
this.cellValue = null;
@@ -53,7 +62,6 @@ function AStar(s, e, row, col, inputGrid) {
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let i = endRow;
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let j = endCol;
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const path = [];
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5866
while (!(i === startRow && j === startCol)) {
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path.push([i, j]);
@@ -64,10 +72,6 @@ function AStar(s, e, row, col, inputGrid) {
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j = nextJ;
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}
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path.push([i, j]);
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for (let i = 0; i < path.length; i += 1) {
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console.log(path[i]);
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}
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};
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7377
const neighbourExplorer = (i, j, parentI, parentJ, openList, openListMap,
@@ -173,7 +177,10 @@ function AStar(s, e, row, col, inputGrid) {
173177
}
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return true;
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};
176-
search();
180+
if (!search()) {
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throw new Error('Error: Endpoint cannot be reached');
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}
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return path;
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}
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