Gather data

src/test/java/puzzle/SwedishGeneratorTest.java

@@ -29,4 +29,35 @@ class SwedishGeneratorTest {
       assertEquals(0, s.r(1));
       assertEquals(2, s.c(1));
    }
+
+   @Test
+   void testStaticSlotMethods() {
+      // Test static r and c extraction
+      // packedRs: 1 at index 0, 2 at index 1
+      long packedRs = (1L << 0) | (2L << 4);
+      assertEquals(1, Slot.r(packedRs, 0));
+      assertEquals(2, Slot.r(packedRs, 1));
+
+      // Test static horiz
+      // dir 2 (right) is horizontal
+      assertTrue(Slot.horiz(2)); 
+      // dir 3 (down) is vertical
+      assertTrue(!Slot.horiz(3));
+   }
+
+   @Test
+   void testForEachSlot() {
+      SwedishGenerator generator = new SwedishGenerator(3, 3);
+      Grid             grid      = generator.makeEmptyGrid();
+      grid.setCharAt(0, 0, '2'); // right
+      
+      java.util.concurrent.atomic.AtomicInteger count = new java.util.concurrent.atomic.AtomicInteger(0);
+      generator.forEachSlot(grid, (key, rs, cs, len) -> {
+         count.incrementAndGet();
+         assertEquals(2, len);
+         assertEquals(0, Slot.r(rs, 0));
+         assertEquals(1, Slot.c(cs, 0));
+      });
+      assertEquals(1, count.get());
+   }
 }