feat(tblock): implement initial position

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

@@ -0,0 +1,24 @@
+package blocks.implementation
+
+import blocks.Block
+import blocks.Rotation
+import movements.Direction
+import movements.Position
+
+class TBlock(private val initialPosition: Position): Block {
+
+    val positions = listOf(Position(0, 1), Position(1, 0), Position(1,1), Position(1, 2))
+
+    override fun getNeededPositions(): Collection<Position> {
+        return positions.map({pos -> pos.addAxes(initialPosition)})
+    }
+
+    override fun rotate(degree: Rotation) {
+        TODO("Not yet implemented")
+    }
+
+    override fun move(direction: Direction) {
+        TODO("Not yet implemented")
+    }
+
+}

src/test/kotlin/blocks/TBlock/TBlockTest.kt

@@ -0,0 +1,36 @@
+package blocks.TBlock
+
+import blocks.implementation.TBlock
+import movements.Position
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class TBlockTest {
+
+    @Test
+    fun `position 0,0 needed positions are (0,0), (1,0), (1,1), (1,2)`() {
+        val tBlock = TBlock(Position(0, 0))
+        assertEquals(
+            listOf(Position(0, 1), Position(1, 0), Position(1, 1), Position(1, 2)),
+            tBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    fun `position 0,1 needed positions are (0,2), (1, 1), (1,2), (1,3)`() {
+        val tBlock = TBlock(Position(0, 1))
+        assertEquals(
+            listOf(Position(0, 2), Position(1, 1), Position(1, 2), Position(1, 3)),
+            tBlock.getNeededPositions()
+        )
+    }
+
+    @Test
+    fun `position 1,0 needed positions are (1, 1), (2,0), (2,1), (2,2)`() {
+        val tBlock = TBlock(Position(1, 0))
+        assertEquals(
+            listOf(Position(1, 1), Position(2, 0), Position(2, 1), Position(2, 2)),
+            tBlock.getNeededPositions()
+        )
+    }
+}