diff --git a/test/built-ins/Temporal/Instant/prototype/valueOf/basic.js b/test/built-ins/Temporal/Instant/prototype/valueOf/basic.js
new file mode 100644
index 0000000000..6f4bcea9e3
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/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.instant.prototype.valueof
+description: Basic tests for valueOf().
+features: [Temporal]
+---*/
+
+const instant = new Temporal.Instant(100n);
+const instant2 = new Temporal.Instant(987654321n);
+
+assert.throws(TypeError, () => instant.valueOf(), "valueOf");
+assert.throws(TypeError, () => instant < instant, "<");
+assert.throws(TypeError, () => instant <= instant, "<=");
+assert.throws(TypeError, () => instant > instant, ">");
+assert.throws(TypeError, () => instant >= instant, ">=");
+assert.sameValue(instant === instant, true, "===");
+assert.sameValue(instant === instant2, false, "===");
+assert.sameValue(instant !== instant, false, "!==");
+assert.sameValue(instant !== instant2, true, "!==");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/valueOf/basic.js b/test/built-ins/Temporal/ZonedDateTime/prototype/valueOf/basic.js
new file mode 100644
index 0000000000..4d576fd022
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/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.zoneddatetime.prototype.valueof
+description: Basic tests for valueOf().
+features: [Temporal]
+---*/
+
+const zonedDateTime = new Temporal.ZonedDateTime(100n, "UTC");
+const zonedDateTime2 = new Temporal.ZonedDateTime(987654321n, "UTC");
+
+assert.throws(TypeError, () => zonedDateTime.valueOf(), "valueOf");
+assert.throws(TypeError, () => zonedDateTime < zonedDateTime, "<");
+assert.throws(TypeError, () => zonedDateTime <= zonedDateTime, "<=");
+assert.throws(TypeError, () => zonedDateTime > zonedDateTime, ">");
+assert.throws(TypeError, () => zonedDateTime >= zonedDateTime, ">=");
+assert.sameValue(zonedDateTime === zonedDateTime, true, "===");
+assert.sameValue(zonedDateTime === zonedDateTime2, false, "===");
+assert.sameValue(zonedDateTime !== zonedDateTime, false, "!==");
+assert.sameValue(zonedDateTime !== zonedDateTime2, true, "!==");