feat(position): implement move

src/main/kotlin/movements/Position.kt

@@ -1,3 +1,13 @@
 package movements
 
-data class Position(val row: Int, val column: Int)
+data class Position(val row: Int, val column: Int) {
+
+    fun move(direction: Direction): Position {
+        return when(direction) {
+            Direction.DOWN -> Position(row, column + 1)
+            Direction.LEFT -> Position(row - 1, column)
+            Direction.RIGHT -> Position(row + 1, column)
+        }
+    }
+
+}

src/test/kotlin/movements/PositionTest.kt

@@ -0,0 +1,31 @@
+package movements
+
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class PositionTest {
+
+    lateinit var position: Position
+
+    @BeforeEach
+    fun setUp() {
+        position = Position(1,1)
+    }
+
+    @Test
+    fun `Apply DOWN direction`(){
+        assertEquals(Position(1,2), position.move(Direction.DOWN))
+    }
+
+    @Test
+    fun `Apply LEFT direction`(){
+        assertEquals(Position(0,1), position.move(Direction.LEFT))
+    }
+
+    @Test
+    fun `Apply RIGHT direction`(){
+        assertEquals(Position(2,1), position.move(Direction.RIGHT))
+    }
+
+}