feat(jblock): implement simple movement

src/main/kotlin/blocks/implementation/JBlock.kt

@@ -5,7 +5,7 @@ import blocks.Rotation
 import movements.Direction
 import movements.Position
 
-class JBlock(private val initialPosition: Position) : Block {
+class JBlock(private var initialPosition: Position) : Block {
 
     private val initialState = listOf(Position(0, 0), Position(1, 0), Position(1, 1), Position(1, 2))
 
@@ -18,7 +18,7 @@ class JBlock(private val initialPosition: Position) : Block {
     }
 
     override fun move(direction: Direction) {
-        TODO("Not yet implemented")
+        initialPosition = initialPosition.move(direction)
     }
 
 }

src/test/kotlin/blocks/JBlock/JBlockMoveTest.kt

@@ -0,0 +1,77 @@
+package blocks.JBlock
+
+import blocks.MoveTest
+import blocks.implementation.JBlock
+import movements.Direction
+import movements.Position
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class JBlockMoveTest : MoveTest {
+
+    private lateinit var jBlock: JBlock
+
+    @BeforeEach
+    fun setUp() {
+        jBlock = JBlock(Position(2, 2))
+    }
+
+    @Test
+    override fun `Move to Right changes column plus one`() {
+        jBlock.move(Direction.RIGHT)
+        assertEquals(
+            listOf(Position(2, 3), Position(3, 3), Position(3, 4), Position(3, 5)),
+            jBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    override fun `Double move to Right changes column plus two`() {
+        jBlock.move(Direction.RIGHT)
+        jBlock.move(Direction.RIGHT)
+        assertEquals(
+            listOf(Position(2, 4), Position(3, 4), Position(3, 5), Position(3, 6)),
+            jBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    override fun `Move to Left changes column minus one`() {
+        jBlock.move(Direction.LEFT)
+        assertEquals(
+            listOf(Position(2, 1), Position(3, 1), Position(3, 2), Position(3, 3)),
+            jBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    override fun `Double move to Left changes column minus two`() {
+        jBlock.move(Direction.LEFT)
+        jBlock.move(Direction.LEFT)
+        assertEquals(
+            listOf(Position(2, 0), Position(3, 0), Position(3, 1), Position(3, 2)),
+            jBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    override fun `Move down changes row plus one`() {
+        jBlock.move(Direction.DOWN)
+        assertEquals(
+            listOf(Position(3, 2), Position(4, 2), Position(4, 3), Position(4, 4)),
+            jBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    override fun `Double move Down changes row plus two`() {
+        jBlock.move(Direction.DOWN)
+        jBlock.move(Direction.DOWN)
+        assertEquals(
+            listOf(Position(4, 2), Position(5, 2), Position(5, 3), Position(5, 4)),
+            jBlock.getNeededPositions()
+        )
+    }
+
+}