feat(base): implement progression system

src/test/java/games/dmg/spigotbase/BaseNavigationProgressionTest.java

@@ -0,0 +1,24 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Map;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class BaseNavigationProgressionTest {
+    @Test
+    void fiveHundredthGrassOrDirtBlockUnlocksBaseII() {
+        BaseProgressionService service =
+            new BaseProgressionService(PluginSettings.from(Map.of()));
+        PlayerState player = PlayerState.newPlayer(UUID.randomUUID(), "Alex")
+            .withGrassAndDirtProgress(499, 1);
+
+        ProgressionUpdate update = service.recordGrassOrDirtBreak(player);
+
+        assertEquals(2, update.player().baseLevel());
+        assertTrue(update.player().navigationEnabled());
+        assertTrue(update.unlockedBaseLevel());
+    }
+}