Add failing test for samualtnorman#256

Author: SarahIsWeird

game-scripts-tests/this_in_lambda_in_object.ts

@@ -0,0 +1,23 @@
+export default ({ expect }: typeof import('vitest')) => {
+    const myObject = {
+        a: 0,
+        b: function () {
+            this.a++
+            return this.a
+        },
+        c: function (value: number = this.a) {
+            this.a = value + 1
+        },
+        d: function ({ value = this.a }: { value?: number }) {
+            this.a = value + 1
+        }
+    }
+
+    expect(myObject.a).toBe(0)
+    myObject.b()
+    expect(myObject.a).toBe(1)
+    myObject.c()
+    expect(myObject.a).toBe(2)
+    myObject.d({})
+    expect(myObject.a).toBe(3)
+}