Fixed crash in tile editor as a result of adding Fallout, which has no "occursOn" terrains

tests/src/de/tomgrill/gdxtesting/examples/AssetExistsExampleTest.java

@@ -1,30 +0,0 @@
-//  Taken from https://github.com/TomGrill/gdx-testing
-
-package de.tomgrill.gdxtesting.examples;
-
-import com.badlogic.gdx.Gdx;
-import com.unciv.models.gamebasics.GameBasics;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import de.tomgrill.gdxtesting.GdxTestRunner;
-
-import static org.junit.Assert.assertTrue;
-
-@RunWith(GdxTestRunner.class)
-public class AssetExistsExampleTest {
-
-	@Test
-	public void gamePngExists() {
-		assertTrue("This test will only pass when the game.png exists",
-				Gdx.files.local("game.png").exists());
-	}
-
-	@Test
-	public void gameBasicsLoad() {
-		assertTrue("This test will only pass when the game.png exists",
-				GameBasics.INSTANCE.getBuildings().size() > 0);
-	}
-
-}

tests/src/de/tomgrill/gdxtesting/examples/BasicTests.kt

@@ -0,0 +1,36 @@
+//  Taken from https://github.com/TomGrill/gdx-testing
+
+package de.tomgrill.gdxtesting.examples
+
+import com.badlogic.gdx.Gdx
+import com.unciv.UnCivGame
+import com.unciv.models.gamebasics.GameBasics
+import com.unciv.ui.mapeditor.MapEditorScreen
+import de.tomgrill.gdxtesting.GdxTestRunner
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(GdxTestRunner::class)
+class BasicTests {
+
+    @Test
+    fun gamePngExists() {
+        assertTrue("This test will only pass when the game.png exists",
+                Gdx.files.local("game.png").exists())
+    }
+
+    @Test
+    fun gameBasicsLoad() {
+        assertTrue("This test will only pass when the GameBasics can initialize, and there are buildings",
+                GameBasics.Buildings.size > 0)
+    }
+
+    @Test
+    fun canOpenMapEditorScreen() {
+        UnCivGame.Current.setScreen(MapEditorScreen(UnCivGame.Current.gameInfo.tileMap))
+        assertTrue("This test will only pass when we can open the map editor screen",
+                GameBasics.Buildings.size > 0)
+    }
+
+}