tests + ado equals override

app/src/main/java/chess/model/pieces/Bishop.java

@@ -20,4 +20,9 @@ public class Bishop extends Piece {
 		return 0;
 	}
 
+	@Override
+	public boolean equals(Piece obj) {
+		return (obj instanceof Bishop && ((Bishop) obj).getColor() == this.getColor());
+	}
+
 }

app/src/main/java/chess/model/pieces/King.java

@@ -19,4 +19,9 @@ public class King extends Piece {
 	public int hashCode() {
 		return 1;
 	}
+
+	@Override
+	public boolean equals(Piece obj) {
+		return (obj instanceof King && ((King) obj).getColor() == this.getColor());
+	}
 }

app/src/main/java/chess/model/pieces/Knight.java

@@ -19,4 +19,9 @@ public class Knight extends Piece {
 	public int hashCode() {
 		return 2;
 	}
+
+	@Override
+	public boolean equals(Piece obj) {
+		return (obj instanceof Knight && ((Knight) obj).getColor() == this.getColor());
+	}
 }

app/src/main/java/chess/model/pieces/Pawn.java

@@ -23,4 +23,9 @@ public class Pawn extends Piece {
 	public int hashCode() {
 		return 3;
 	}
+
+	@Override
+	public boolean equals(Piece obj) {
+		return (obj instanceof Pawn && ((Pawn) obj).getColor() == this.getColor());
+	}
 }

app/src/main/java/chess/model/pieces/Queen.java

@@ -19,4 +19,9 @@ public class Queen extends Piece {
 	public int hashCode() {
 		return 4;
 	}
+
+	@Override
+	public boolean equals(Piece obj) {
+		return (obj instanceof Queen && ((Queen) obj).getColor() == this.getColor());
+	}
 }

app/src/main/java/chess/model/pieces/Rook.java

@@ -19,4 +19,9 @@ public class Rook extends Piece {
 	public int hashCode() {
 		return 5;
 	}
+
+	@Override
+	public boolean equals(Piece obj) {
+		return (obj instanceof Rook && ((Rook) obj).getColor() == this.getColor());
+	}
 }