Fixed arguments error reporting

Author: floriancargoet

src/engine/StoryState.ts

@@ -1134,10 +1134,10 @@ export class StoryState {
         ) {
           throw new Error(
             "ink arguments when calling EvaluateFunction / ChoosePathStringWithParameters must be" +
-            "number, string, bool or InkList. Argument was " +
-            (nullIfUndefined(arguments[i]) === null)
-              ? "null"
-              : arguments[i].constructor.name
+              "number, string, bool or InkList. Argument was " +
+              (nullIfUndefined(args[i]) === null
+                ? "null"
+                : args[i].constructor.name)
           );
         }
 

src/tests/specs/inkjs/engine/Integration.spec.ts

@@ -175,6 +175,22 @@ describe("Integration", () => {
     expect(context.story.EvaluateFunction("fn_echo", [5.3])).toEqual(5.3);
   });
 
+  it("should report invalid params passed to ink functions", () => {
+    class BadParameter {}
+    expect(() =>
+      context.story.EvaluateFunction("fn_params", [new BadParameter()])
+    ).toThrow("Argument was BadParameter");
+  });
+
+  it("should report invalid params passed to knots/stitches", () => {
+    class BadParameter {}
+    expect(() =>
+      context.story.ChoosePathString("stitch_with_param", undefined, [
+        new BadParameter(),
+      ])
+    ).toThrow("Argument was BadParameter");
+  });
+
   it("should return output and return value from ink function calls", () => {
     expect(context.story.EvaluateFunction("fn_print", [], true)).toEqual({
       output: "function called\n",