test(lib): ensure list mapper does not fail when passed IResolvables

Closes #910

Closes #835

packages/cdktf/test/runtime.test.ts

@@ -1,6 +1,7 @@
 import { resolve } from "../lib/_tokens";
 import { listMapper, hashMapper, anyToTerraform } from "../lib/runtime";
 import { Token } from "../lib/tokens/token";
+import { Intrinsic } from "../lib/tokens/private/intrinsic";
 
 const resolveExpression = (expr: any) => resolve(null as any, expr);
 describe("Runtime", () => {
@@ -85,5 +86,39 @@ describe("Runtime", () => {
         }
       `);
     });
+
+    it("can be passed tokenized resolvables", () => {
+      const identity = jest.fn().mockImplementation((x: any) => x);
+      const reference = Token.asList(
+        "${some_resource.my_resource.some_attribute_array}"
+      );
+
+      expect(
+        resolveExpression({
+          x: listMapper(identity)(reference),
+        })
+      ).toMatchInlineSnapshot(`
+        Object {
+          "x": "\${some_resource.my_resource.some_attribute_array}",
+        }
+      `);
+    });
+
+    it("can be passed untokenized resolvables", () => {
+      const identity = jest.fn().mockImplementation((x: any) => x);
+      const reference = new Intrinsic(
+        "${some_resource.my_resource.some_attribute_array}"
+      );
+
+      expect(
+        resolveExpression({
+          x: listMapper(identity)(reference),
+        })
+      ).toMatchInlineSnapshot(`
+        Object {
+          "x": "\${some_resource.my_resource.some_attribute_array}",
+        }
+      `);
+    });
   });
 });