Refactoring in MoveStrategy and its tests

src/main/com/paktalin/chess/moves/KingMoveStrategy.java

@@ -6,19 +6,16 @@ import com.paktalin.chess.Position;
  * Created by Paktalin on 31/05/2018.
  */
 
-public class KingMoveStrategy extends MoveStrategy{
+public class KingMoveStrategy implements MoveStrategy{
 
     @Override
     public boolean isMovable(Position from, Position to) {
-        initialize(from, to);
-        return !(distantRows() || distantColumns());
+        boolean nearbyRows = zeroOrOneDistance(from.getRow(), to.getRow());
+        boolean nearbyColumns = zeroOrOneDistance(from.getIntColumn(), to.getIntColumn());
+        return nearbyRows && nearbyColumns;
     }
 
-    private boolean distantRows() {
-        return Math.abs(toRow - fromRow) > 1;
-    }
-
-    private boolean distantColumns() {
-        return Math.abs(toColumn - fromColumn) > 1;
+    private boolean zeroOrOneDistance(int from, int to) {
+        return Math.abs(to - from) <= 1;
     }
 }

src/main/com/paktalin/chess/moves/MoveStrategy.java

@@ -6,16 +6,6 @@ import com.paktalin.chess.Position;
  * Created by Paktalin on 31/05/2018.
  */
 
-public abstract class MoveStrategy {
-    int fromRow, fromColumn;
-    int toRow, toColumn;
-
-    void initialize(Position from, Position to) {
-        fromRow = from.getRow();
-        fromColumn = from.getIntColumn();
-        toRow = to.getRow();
-        toColumn = to.getIntColumn();
-    }
-
-    public abstract boolean isMovable(Position from, Position to);
+public interface MoveStrategy {
+    boolean isMovable(Position from, Position to);
 }

src/main/com/paktalin/chess/moves/QueenMoveStrategy.java

@@ -6,23 +6,21 @@ import com.paktalin.chess.Position;
  * Created by Paktalin on 31/05/2018.
  */
 
-public class QueenMoveStrategy extends MoveStrategy {
+public class QueenMoveStrategy implements MoveStrategy {
 
     @Override
     public boolean isMovable(Position from, Position to) {
-        initialize(from, to);
-        return sameRow() || sameColumn() || diagonal();
+        boolean sameRow = sameCoordinate(from.getRow(), to.getRow());
+        boolean sameColumn = sameCoordinate(from.getIntColumn(), to.getIntColumn());
+        boolean diagonal = diagonal(from, to);
+        return sameRow || sameColumn || diagonal;
     }
 
-    private boolean sameRow() {
-        return fromRow == toRow;
+    private boolean sameCoordinate(int from, int to) {
+        return from == to;
     }
 
-    private boolean sameColumn() {
-        return fromColumn == toColumn;
-    }
-
-    private boolean diagonal() {
-        return Math.abs(toRow - fromRow) == Math.abs(toColumn - fromColumn);
+    private boolean diagonal(Position from, Position to) {
+        return Math.abs(to.getRow() - from.getRow()) == Math.abs(to.getIntColumn() - from.getIntColumn());
     }
 }

src/test/com/paktalin/chess/moves/KingMoveStrategyTest.java

 package com.paktalin.chess.moves;
 
 import com.paktalin.chess.Position;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * Created by Paktalin on 31/05/2018.
  */
 
-class KingMoveStrategyTest extends MoveStrategyTest {
-
-    @Override
-    MoveStrategy moveStrategy() {
-        return new KingMoveStrategy();
-    }
+class KingMoveStrategyTest {
 
-    @Override
-    Position accessiblePosition() {
-        return Position.create("a6");
-    }
+    private Position initialPosition = Position.create("b5");
+    private MoveStrategy moveStrategy = new KingMoveStrategy();
 
-    @Override
-    Position notAccessiblePosition() {
-        return Position.create("d4");
+    @Test
+    void isMovable() {
+        assertTrue(moveStrategy.isMovable(initialPosition, Position.create("a6")));
+        assertFalse(moveStrategy.isMovable(initialPosition, Position.create("d4")));
     }
 }
\ No newline at end of file

src/test/com/paktalin/chess/moves/MoveStrategyTest.java

-package com.paktalin.chess.moves;
-
-import com.paktalin.chess.Position;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
-/**
- * Created by Paktalin on 31/05/2018.
- */
-
-abstract class MoveStrategyTest {
-    private Position accessiblePosition, notAccessiblePosition, initialPosition;
-    private MoveStrategy moveStrategy;
-
-    @BeforeEach
-    void init() {
-        initialPosition = Position.create("b5");
-        moveStrategy = moveStrategy();
-        accessiblePosition = accessiblePosition();
-        notAccessiblePosition = notAccessiblePosition();
-    }
-
-    abstract MoveStrategy moveStrategy();
-    abstract Position accessiblePosition();
-    abstract Position notAccessiblePosition();
-
-    @Test
-    void isMovable() {
-        assertTrue(moveStrategy.isMovable(initialPosition, accessiblePosition));
-        assertFalse(moveStrategy.isMovable(initialPosition, notAccessiblePosition));
-    }
-}

src/test/com/paktalin/chess/moves/QueenMoveStrategyTest.java

 package com.paktalin.chess.moves;
 
 import com.paktalin.chess.Position;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * Created by Paktalin on 31/05/2018.
  */
 
-class QueenMoveStrategyTest extends MoveStrategyTest {
-
-    @Override
-    MoveStrategy moveStrategy() {
-        return  new QueenMoveStrategy();
-    }
+class QueenMoveStrategyTest {
 
-    @Override
-    Position accessiblePosition() {
-        return Position.create("d3");
-    }
+    private Position initialPosition = Position.create("b5");
+    private MoveStrategy moveStrategy = new QueenMoveStrategy();
 
-    @Override
-    Position notAccessiblePosition() {
-        return Position.create("f7");
+    @Test
+    void isMovable() {
+        assertTrue(moveStrategy.isMovable(initialPosition, Position.create("d3")));
+        assertFalse(moveStrategy.isMovable(initialPosition, Position.create("f7")));
     }
 }