Add test for evaluating all NPC scripts

src/test/java/scripting/ScriptEvaluationTest.java

@@ -0,0 +1,45 @@
+package scripting;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import javax.script.ScriptEngine;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class ScriptEvaluationTest {
+    private AbstractScriptManager scriptManager = new AbstractScriptManager() {};
+
+    @BeforeAll
+    static void muteGraal() {
+        System.setProperty("polyglot.engine.WarnInterpreterOnly", "false");
+    }
+
+    public static List<String> npcScriptFiles() throws IOException {
+        Path npcScriptDirectory = Path.of("scripts", "npc");
+        try (Stream<Path> pathStream = Files.walk(npcScriptDirectory)) {
+            return pathStream
+                    .filter(Files::isRegularFile)
+                    .map(ScriptEvaluationTest::mapToNpcScriptPath)
+                    .toList();
+        }
+    }
+
+    private static String mapToNpcScriptPath(Path path) {
+        return "npc/%s".formatted(path.getFileName().toString());
+    }
+
+    @ParameterizedTest
+    @MethodSource("npcScriptFiles")
+    void npcScriptShouldEvaluate(String npcScriptPath) {
+        ScriptEngine scriptEngine = scriptManager.getInvocableScriptEngine(npcScriptPath);
+
+        assertNotNull(scriptEngine);
+    }
+}