From 244e633ad39d03f2d5b432a426bacefa7f2fb3cb Mon Sep 17 00:00:00 2001
From: Nick Stolbov <nick.stolbov@informatik.hs-fulda.de>
Date: Sun, 30 Jan 2022 18:19:00 +0100
Subject: [PATCH] Added validateCleanPath for ChessBoard class with test

---
 src/main/java/Game/ChessObj/ChessBoard.java   | 41 +++++++++++++++++-
 .../java/Game/ChessObj/ChessBoardTest.java    | 42 ++++++++++++++-----
 2 files changed, 70 insertions(+), 13 deletions(-)

diff --git a/src/main/java/Game/ChessObj/ChessBoard.java b/src/main/java/Game/ChessObj/ChessBoard.java
index 8b32b3c..8477a4b 100644
--- a/src/main/java/Game/ChessObj/ChessBoard.java
+++ b/src/main/java/Game/ChessObj/ChessBoard.java
@@ -76,13 +76,50 @@ public class ChessBoard {
         return cellSymbol;
     }
 
-    public boolean isCellInBoard(int x, int y){
-        if(x >= 0 && x < board[0].length && y >= 0 && y < board.length)
+    public boolean isCellInBoard(int x, int y) {
+        if (x >= 0 && x < board[0].length && y >= 0 && y < board.length)
             return true;
         return false;
     }
 
+    protected boolean validateCleanPath(int sourceX, int sourceY, final int destX, final int destY) {
+        int deltaX = destX - sourceX;
+        int deltaY = destY - sourceY;
+
+        int stepX = getStepWidth(deltaX);
+        int stepY = getStepWidth(deltaY);
+        sourceX += stepX;
+        sourceY += stepY;
+        if (!isCellInBoard(sourceX, sourceY) || !isCellInBoard(destX, destY))
+            return false;
+        while (!(sourceX == destX && sourceY == destY)) {
+            if (board[sourceY][sourceX] != null)
+                return false;
+            sourceX += stepX;
+            sourceY += stepY;
+            if (sourceX == destX && sourceY == destY)
+                return true;
+            if (sourceX > 7 || sourceY > 7)
+                return false;
+        }
+
+        return false;
+    }
+
+    private int getStepWidth(int delta) {
+        if (delta == 0)
+            return 0;
+        else if (delta > 0)
+            return 1;
+        else
+            return -1;
+    }
+
     public ChessFigure[][] getBoard() {
         return this.board;
     }
+
+    protected void setChessBoard(ChessFigure[][] board) {
+        this.board = board;
+    }
 }
diff --git a/src/test/java/Game/ChessObj/ChessBoardTest.java b/src/test/java/Game/ChessObj/ChessBoardTest.java
index 0053e9f..459b95a 100644
--- a/src/test/java/Game/ChessObj/ChessBoardTest.java
+++ b/src/test/java/Game/ChessObj/ChessBoardTest.java
@@ -5,6 +5,7 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.mock;
 
 class ChessBoardTest {
 
@@ -33,16 +34,16 @@ class ChessBoardTest {
                     assertEquals(new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.BLACK), board[y][x]);
                     continue;
                 }
-                if(y == 6) {
+                if (y == 6) {
                     assertEquals(new ChessFigure(ChessFigure.Type.PAWN, ChessFigure.Team.WHITE), board[y][x]);
                     continue;
                 }
 
-                if(y == 0){
+                if (y == 0) {
                     assertEquals(new ChessFigure(startOrder[x], ChessFigure.Team.BLACK), board[y][x]);
                     continue;
                 }
-                if(y == 7){
+                if (y == 7) {
                     assertEquals(new ChessFigure(startOrder[x], ChessFigure.Team.WHITE), board[y][x]);
                     continue;
                 }
@@ -55,14 +56,14 @@ class ChessBoardTest {
     @Test
     void getCellSymbols() {
         String[][] expectedArray = {
-                {"|T|","|Z|","|I|","|Q|","|K|","|I|","|Z|","|T|"},
-                {"|o|","|o|","|o|","|o|","|o|","|o|","|o|","|o|"},
-                {"   ","   ","   ","   ","   ","   ","   ","   "},
-                {"   ","   ","   ","   ","   ","   ","   ","   "},
-                {"   ","   ","   ","   ","   ","   ","   ","   "},
-                {"   ","   ","   ","   ","   ","   ","   ","   "},
-                {" o "," o "," o "," o "," o "," o "," o "," o "},
-                {" T "," Z "," I "," Q "," K "," I "," Z "," T "}
+                {"|T|", "|Z|", "|I|", "|Q|", "|K|", "|I|", "|Z|", "|T|"},
+                {"|o|", "|o|", "|o|", "|o|", "|o|", "|o|", "|o|", "|o|"},
+                {"   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "},
+                {"   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "},
+                {"   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "},
+                {"   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "},
+                {" o ", " o ", " o ", " o ", " o ", " o ", " o ", " o "},
+                {" T ", " Z ", " I ", " Q ", " K ", " I ", " Z ", " T "}
         };
         assertArrayEquals(expectedArray, chessBoard.getCellSymbols());
     }
@@ -77,4 +78,23 @@ class ChessBoardTest {
         assertFalse(chessBoard.isCellInBoard(4, 8));
         assertFalse(chessBoard.isCellInBoard(10, 20));
     }
+
+    @Test
+    void validateCleanPath() {
+        ChessFigure[][] tempBoard = chessBoard.getBoard();
+
+        tempBoard[3][0] = mock(ChessFigure.class);
+        tempBoard[3][5] = mock(ChessFigure.class);
+        chessBoard.setChessBoard(tempBoard);
+
+        assertFalse(chessBoard.validateCleanPath(-2, 0, 1, 4));
+        assertTrue(chessBoard.validateCleanPath(0, 3, 5, 3));
+        assertFalse(chessBoard.validateCleanPath(0, 3, 6, 3));
+        assertFalse(chessBoard.validateCleanPath(0, 3, 7, 3));
+        assertFalse(chessBoard.validateCleanPath(0, 3, 5, 5));
+        assertFalse(chessBoard.validateCleanPath(0, 3, 4, 7));
+        assertTrue(chessBoard.validateCleanPath(0, 3, 2, 5));
+        assertTrue(chessBoard.validateCleanPath(7, 3, 5, 5));
+        assertFalse(chessBoard.validateCleanPath(7, 3, 6, 6));
+    }
 }
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