diff --git a/src/main/kotlin/IBlock.kt b/src/main/kotlin/IBlock.kt
new file mode 100644
index 0000000..78b3d77
--- /dev/null
+++ b/src/main/kotlin/IBlock.kt
@@ -0,0 +1,7 @@
+class IBlock(position: Position) {
+
+    fun getNeededPositions(): List<Position> {
+        TODO()
+    }
+
+}
diff --git a/src/main/kotlin/Position.kt b/src/main/kotlin/Position.kt
new file mode 100644
index 0000000..20b1ef9
--- /dev/null
+++ b/src/main/kotlin/Position.kt
@@ -0,0 +1 @@
+data class Position(val x: Int, val y: Int)
diff --git a/src/test/kotlin/IBlockTest.kt b/src/test/kotlin/IBlockTest.kt
new file mode 100644
index 0000000..185d386
--- /dev/null
+++ b/src/test/kotlin/IBlockTest.kt
@@ -0,0 +1,15 @@
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class IBlockTest {
+
+    @Test
+    fun `position 0,0 needed positions are (0,0), (0,1), (0,2), (0,3)`() {
+        val iBlock: IBlock = IBlock(Position(0, 0))
+        assertEquals(
+            listOf(Position(0, 0), Position(0, 1), Position(0, 2), Position(0, 3)),
+            iBlock.getNeededPositions()
+        )
+    }
+
+}
\ No newline at end of file