diff --git a/tests/cases/fourslash/salsaMethodsOnAssignedFunctionExpressions.ts b/tests/cases/fourslash/salsaMethodsOnAssignedFunctionExpressions.ts
new file mode 100644
index 00000000000..a73207c01d2
--- /dev/null
+++ b/tests/cases/fourslash/salsaMethodsOnAssignedFunctionExpressions.ts
@@ -0,0 +1,17 @@
+/// <reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: something.js
+////var C = function () { }
+/////**
+//// * The prototype method.
+//// * @param {string} a Parameter definition.
+//// */
+////function f(a) {}
+////C.prototype.m = f;
+////
+////var x = new C();
+////x/*1*/./*2*/m();
+goTo.marker('1');
+verify.quickInfoIs('var x: {\n    m: (a: string) => void;\n}');
+goTo.marker('2');
+verify.completionListContains('m', '(property) C.m: (a: string) => void', 'The prototype method.');