create tests for SpecialFirstMove

src/test/java/helper/TestHelper.java

@@ -27,6 +27,10 @@ public static boolean hasPiece(Entity entity, PieceType pieceType, int owner) {
                 && entity.piece.identifier.ownerId() == owner;
     }
 
+    public static boolean hasNoPiece(Entity entity) {
+        return entity.piece == null;
+    }
+
     public static MoveIntention findMoveToTile(IChessGame game, Entity piece, Point displayTile) {
         return piece.findValidMoves(game, false)
                 .filter(move -> {

src/test/java/jchess/common/moveset/special/SpecialFirstMoveTest.java

@@ -0,0 +1,79 @@
+package jchess.common.moveset.special;
+
+import dx.schema.types.PieceType;
+import jchess.common.moveset.MoveIntention;
+import jchess.ecs.Entity;
+import jchess.gamemode.PieceStore;
+import jchess.gamemode.square2p.Square2PlayerGame;
+import jchess.gamemode.square2p.Square2pPieceLayouts;
+import jchess.gamemode.square2p.Square2pPieces;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static helper.TestHelper.findMoveToTile;
+import static helper.TestHelper.getTileAtPosition;
+import static helper.TestHelper.hasNoPiece;
+import static helper.TestHelper.hasPiece;
+
+@SuppressWarnings("FieldCanBeLocal")
+public class SpecialFirstMoveTest {
+    private Square2PlayerGame game;
+
+    private Entity x0y6;
+    private Entity x0y5;
+    private Entity x0y4;
+    private Entity x0y3;
+
+    @BeforeEach
+    public void init() {
+        game = new Square2PlayerGame(new PieceStore(Square2pPieces.values()), Square2pPieceLayouts.Standard);
+        game.start();
+
+        x0y6 = getTileAtPosition(game, 0, 6);
+        x0y5 = getTileAtPosition(game, 0, 5);
+        x0y4 = getTileAtPosition(game, 0, 4);
+        x0y3 = getTileAtPosition(game, 0, 3);
+
+        Assertions.assertTrue(hasPiece(x0y6, PieceType.PAWN, 0));
+    }
+
+    @Test
+    public void test_specialMoveAllowed() {
+        MoveIntention doubleMove = findMoveToTile(game, x0y6, x0y4);
+        Assertions.assertNotNull(doubleMove);
+        doubleMove.onClick().run();
+
+        Assertions.assertTrue(hasPiece(x0y4, PieceType.PAWN, 0));
+        Assertions.assertTrue(hasNoPiece(x0y5));
+        Assertions.assertTrue(hasNoPiece(x0y6));
+    }
+
+    @Test
+    public void test_specialMoveTooLate() {
+        MoveIntention singleMove = findMoveToTile(game, x0y6, x0y5);
+        Assertions.assertNotNull(singleMove);
+        singleMove.onClick().run();
+
+        MoveIntention doubleMove = findMoveToTile(game, x0y5, x0y3);
+        MoveIntention singleMove2 = findMoveToTile(game, x0y5, x0y4);
+        Assertions.assertNull(doubleMove);
+        Assertions.assertNotNull(singleMove2);
+    }
+
+    @Test
+    public void test_specialMoveBlockedNear() {
+        game.createPiece(x0y5, PieceType.PAWN, 1);
+
+        MoveIntention doubleMove = findMoveToTile(game, x0y6, x0y4);
+        Assertions.assertNull(doubleMove);
+    }
+
+    @Test
+    public void test_specialMoveBlockedFar() {
+        game.createPiece(x0y4, PieceType.PAWN, 1);
+
+        MoveIntention doubleMove = findMoveToTile(game, x0y6, x0y4);
+        Assertions.assertNull(doubleMove);
+    }
+}