diff --git a/test/intl402/Temporal/Instant/prototype/toLocaleString/options-conflict.js b/test/intl402/Temporal/Instant/prototype/toLocaleString/options-conflict.js
index 3c163623fe..490d6c27df 100644
--- a/test/intl402/Temporal/Instant/prototype/toLocaleString/options-conflict.js
+++ b/test/intl402/Temporal/Instant/prototype/toLocaleString/options-conflict.js
@@ -2,13 +2,46 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal.instant.prototype.tolocalestring
+esid: sup-temporal.instant.prototype.tolocalestring
 description: >
-    toLocaleString return a string.
-features: [Temporal]
+    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: [BigInt, 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 instant = new Temporal.Instant(957270896_987_650_000n);
 
 assert.sameValue(typeof instant.toLocaleString("en", { dateStyle: "short" }), "string");
 assert.sameValue(typeof instant.toLocaleString("en", { timeStyle: "short" }), "string");
+
+for (const [ option, value ] of conflictingOptions) {
+  assert.throws(TypeError, function() {
+    instant.toLocaleString("en", { [option]: value, dateStyle: "short" });
+  }, `instant.toLocaleString("en", { ${option}: "${value}",  dateStyle: "short" }) throws TypeError`);
+
+  assert.throws(TypeError, function() {
+    instant.toLocaleString("en", { [option]: value, timeStyle: "short" });
+  }, `instant.toLocaleString("en", { ${option}: "${value}",  timeStyle: "short" }) throws TypeError`);
+}
diff --git a/test/intl402/Temporal/PlainDate/prototype/toLocaleString/options-conflict.js b/test/intl402/Temporal/PlainDate/prototype/toLocaleString/options-conflict.js
index 9af2628116..3deb4c2b24 100644
--- a/test/intl402/Temporal/PlainDate/prototype/toLocaleString/options-conflict.js
+++ b/test/intl402/Temporal/PlainDate/prototype/toLocaleString/options-conflict.js
@@ -2,12 +2,36 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal.plaindate.prototype.tolocalestring
+esid: sup-temporal.plaindate.prototype.tolocalestring
 description: >
-    toLocaleString return a string.
+    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" ],
+];
 const date = new Temporal.PlainDate(2000, 5, 2);
 
 assert.sameValue(typeof date.toLocaleString("en", { dateStyle: "short" }), "string");
+
+for (const [ option, value ] of conflictingOptions) {
+  assert.throws(TypeError, function() {
+    date.toLocaleString("en", { [option]: value, dateStyle: "short" });
+  }, `date.toLocaleString("en", { ${option}: "${value}",  dateStyle: "short" }) throws TypeError`);
+}
diff --git a/test/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js b/test/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js
index ff4cc0b7c3..13fefadde6 100644
--- a/test/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js
+++ b/test/intl402/Temporal/PlainDateTime/prototype/toLocaleString/options-conflict.js
@@ -2,13 +2,46 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal.plaindatetime.prototype.tolocalestring
+esid: sup-temporal.plaindatetime.prototype.tolocalestring
 description: >
-    toLocaleString return a string.
+    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`);
+}
diff --git a/test/intl402/Temporal/PlainTime/prototype/toLocaleString/options-conflict.js b/test/intl402/Temporal/PlainTime/prototype/toLocaleString/options-conflict.js
index 7d02ddc8e4..3bc613c8f6 100644
--- a/test/intl402/Temporal/PlainTime/prototype/toLocaleString/options-conflict.js
+++ b/test/intl402/Temporal/PlainTime/prototype/toLocaleString/options-conflict.js
@@ -2,12 +2,36 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal.plaintime.prototype.tolocalestring
+esid: sup-temporal.plaintime.prototype.tolocalestring
 description: >
-    toLocaleString return a string.
+    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 = [
+  [ "hour", "numeric" ],
+  [ "minute", "numeric" ],
+  [ "second", "numeric" ],
+  [ "dayPeriod", "short" ],
+  [ "fractionalSecondDigits", 3 ],
+];
 const time = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
 
 assert.sameValue(typeof time.toLocaleString("en", { timeStyle: "short" }), "string");
+
+for (const [ option, value ] of conflictingOptions) {
+  assert.throws(TypeError, function() {
+    time.toLocaleString("en", { [option]: value, timeStyle: "short" });
+  }, `time.toLocaleString("en", { ${option}: "${value}",  timeStyle: "short" }) throws TypeError`);
+}
diff --git a/test/intl402/Temporal/ZonedDateTime/prototype/toLocaleString/options-conflict.js b/test/intl402/Temporal/ZonedDateTime/prototype/toLocaleString/options-conflict.js
index b040cd10b8..5cc1162dc4 100644
--- a/test/intl402/Temporal/ZonedDateTime/prototype/toLocaleString/options-conflict.js
+++ b/test/intl402/Temporal/ZonedDateTime/prototype/toLocaleString/options-conflict.js
@@ -2,13 +2,47 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal.zoneddatetime.prototype.tolocalestring
+esid: sup-temporal.zoneddatetime.prototype.tolocalestring
 description: >
-    toLocaleString return a string.
-features: [Temporal]
+    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: [BigInt, 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 ],
+  [ "timeZoneName", "short" ],
+];
 const datetime = new Temporal.ZonedDateTime(957270896_987_650_000n, "UTC");
 
 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`);
+}