diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/valueOf/basic.js b/test/built-ins/Temporal/PlainYearMonth/prototype/valueOf/basic.js
new file mode 100644
index 0000000000..31aed8960d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/valueOf/basic.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.valueof
+description: Basic tests for valueOf().
+features: [Temporal]
+---*/
+
+const plainYearMonth = Temporal.PlainYearMonth.from("1963-02");
+const plainYearMonth2 = Temporal.PlainYearMonth.from("1963-02");
+
+assert.throws(TypeError, () => plainYearMonth.valueOf(), "valueOf");
+assert.throws(TypeError, () => plainYearMonth < plainYearMonth, "<");
+assert.throws(TypeError, () => plainYearMonth <= plainYearMonth, "<=");
+assert.throws(TypeError, () => plainYearMonth > plainYearMonth, ">");
+assert.throws(TypeError, () => plainYearMonth >= plainYearMonth, ">=");
+assert.sameValue(plainYearMonth === plainYearMonth, true, "===");
+assert.sameValue(plainYearMonth === plainYearMonth2, false, "===");
+assert.sameValue(plainYearMonth !== plainYearMonth, false, "!==");
+assert.sameValue(plainYearMonth !== plainYearMonth2, true, "!==");