feat(iblock): add y axis positions

src/main/kotlin/IBlock.kt

@@ -1,7 +1,7 @@
-class IBlock(position: Position) {
+class IBlock(val position: Position) {
 
     fun getNeededPositions(): List<Position> {
-        return listOf(Position(0,0), Position(0, 1), Position(0, 2), Position(0, 3))
+        return listOf(Position(0, this.position.y), Position(0, this.position.y + 1), Position(0, this.position.y + 2), Position(0, this.position.y + 3))
     }
 
 }

src/test/kotlin/IBlockTest.kt

@@ -12,4 +12,13 @@ class IBlockTest {
         )
     }
 
+    @Test
+    fun `position 0,1 needed positions are (0,1), (0,2), (0,3), (0,4)`() {
+        val iBlock: IBlock = IBlock(Position(0, 1))
+        assertEquals(
+            listOf(Position(0, 1), Position(0, 2), Position(0, 3), Position(0, 4)),
+            iBlock.getNeededPositions()
+        )
+    }
+
 }