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diff --git a/js/src/tests/test262/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js b/js/src/tests/test262/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js
new file mode 100644
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+++ b/js/src/tests/test262/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js
@@ -0,0 +1,50 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 Kate Miháliková. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sup-temporal.plaindatetime.prototype.tolocalestring
+description: >
+    Conflicting properties of dateStyle must be rejected with a TypeError for the options argument
+info: |
+    Using sec-temporal-getdatetimeformatpattern:
+    GetDateTimeFormatPattern ( dateStyle, timeStyle, matcher, opt, dataLocaleData, hc )
+
+    1. If dateStyle is not undefined or timeStyle is not undefined, then
+      a. For each row in Table 7, except the header row, do
+        i. Let prop be the name given in the Property column of the row.
+        ii. Let p be opt.[[<prop>]].
+        iii. If p is not undefined, then
+          1. Throw a TypeError exception.
+features: [Temporal]
+---*/
+
+// Table 14 - Supported fields + example value for each field
+const conflictingOptions = [
+  [ "weekday", "short" ],
+  [ "era", "short" ],
+  [ "year", "numeric" ],
+  [ "month", "numeric" ],
+  [ "day", "numeric" ],
+  [ "hour", "numeric" ],
+  [ "minute", "numeric" ],
+  [ "second", "numeric" ],
+  [ "dayPeriod", "short" ],
+  [ "fractionalSecondDigits", 3 ],
+];
+const datetime = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+
+assert.sameValue(typeof datetime.toLocaleString("en", { dateStyle: "short" }), "string");
+assert.sameValue(typeof datetime.toLocaleString("en", { timeStyle: "short" }), "string");
+
+for (const [ option, value ] of conflictingOptions) {
+  assert.throws(TypeError, function() {
+    datetime.toLocaleString("en", { [option]: value, dateStyle: "short" });
+  }, `datetime.toLocaleString("en", { ${option}: "${value}",  dateStyle: "short" }) throws TypeError`);
+
+  assert.throws(TypeError, function() {
+    datetime.toLocaleString("en", { [option]: value, timeStyle: "short" });
+  }, `datetime.toLocaleString("en", { ${option}: "${value}",  timeStyle: "short" }) throws TypeError`);
+}
+
+reportCompare(0, 0);