1 files changed, 57 insertions, 0 deletions
diff --git a/Userland/Libraries/LibJS/Tests/functions/function-name.js b/Userland/Libraries/LibJS/Tests/functions/function-name.js
new file mode 100644
index 0000000000..90520187d9
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/functions/function-name.js
@@ -0,0 +1,57 @@
+test("basic functionality", () => {
+    expect(function () {}.name).toBe("");
+
+    function bar() {}
+    expect(bar.name).toBe("bar");
+    expect((bar.name = "baz")).toBe("baz");
+    expect(bar.name).toBe("bar");
+});
+
+test("function assigned to variable", () => {
+    let foo = function () {};
+    expect(foo.name).toBe("foo");
+    expect((foo.name = "bar")).toBe("bar");
+    expect(foo.name).toBe("foo");
+
+    let a, b;
+    a = b = function () {};
+    expect(a.name).toBe("b");
+    expect(b.name).toBe("b");
+});
+
+test("functions in array assigned to variable", () => {
+    const arr = [function () {}, function () {}, function () {}];
+    expect(arr[0].name).toBe("arr");
+    expect(arr[1].name).toBe("arr");
+    expect(arr[2].name).toBe("arr");
+});
+
+test("functions in objects", () => {
+    let f;
+    let o = { a: function () {} };
+
+    expect(o.a.name).toBe("a");
+    f = o.a;
+    expect(f.name).toBe("a");
+    expect(o.a.name).toBe("a");
+
+    o = { ...o, b: f };
+    expect(o.a.name).toBe("a");
+    expect(o.b.name).toBe("a");
+
+    o.c = function () {};
+    expect(o.c.name).toBe("c");
+});
+
+test("names of native functions", () => {
+    expect(console.debug.name).toBe("debug");
+    expect((console.debug.name = "warn")).toBe("warn");
+    expect(console.debug.name).toBe("debug");
+});
+
+test("cyclic members should not cause infinite recursion (#3471)", () => {
+    let a = [() => 4];
+    a[1] = a;
+    a = a;
+    expect(a[0].name).toBe("a");
+});