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-rw-r--r--Userland/Libraries/LibJS/CMakeLists.txt2
-rw-r--r--Userland/Libraries/LibJS/Forward.h17
-rw-r--r--Userland/Libraries/LibJS/Runtime/ErrorTypes.h1
-rw-r--r--Userland/Libraries/LibJS/Runtime/GlobalObject.cpp2
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp83
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.h28
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.cpp109
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.h28
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp23
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h22
-rw-r--r--Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp2
-rw-r--r--Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.js53
12 files changed, 360 insertions, 10 deletions
diff --git a/Userland/Libraries/LibJS/CMakeLists.txt b/Userland/Libraries/LibJS/CMakeLists.txt
index cc1fea744f..04755eb20b 100644
--- a/Userland/Libraries/LibJS/CMakeLists.txt
+++ b/Userland/Libraries/LibJS/CMakeLists.txt
@@ -144,6 +144,8 @@ set(SOURCES
Runtime/Temporal/PlainTimeConstructor.cpp
Runtime/Temporal/PlainTimePrototype.cpp
Runtime/Temporal/PlainYearMonth.cpp
+ Runtime/Temporal/PlainYearMonthConstructor.cpp
+ Runtime/Temporal/PlainYearMonthPrototype.cpp
Runtime/Temporal/Temporal.cpp
Runtime/Temporal/TimeZone.cpp
Runtime/Temporal/TimeZoneConstructor.cpp
diff --git a/Userland/Libraries/LibJS/Forward.h b/Userland/Libraries/LibJS/Forward.h
index 5e6bfded46..7912e5562e 100644
--- a/Userland/Libraries/LibJS/Forward.h
+++ b/Userland/Libraries/LibJS/Forward.h
@@ -76,14 +76,15 @@
__JS_ENUMERATE(Float32Array, float32_array, Float32ArrayPrototype, Float32ArrayConstructor, float) \
__JS_ENUMERATE(Float64Array, float64_array, Float64ArrayPrototype, Float64ArrayConstructor, double)
-#define JS_ENUMERATE_TEMPORAL_OBJECTS \
- __JS_ENUMERATE(Calendar, calendar, CalendarPrototype, CalendarConstructor) \
- __JS_ENUMERATE(Duration, duration, DurationPrototype, DurationConstructor) \
- __JS_ENUMERATE(Instant, instant, InstantPrototype, InstantConstructor) \
- __JS_ENUMERATE(PlainDate, plain_date, PlainDatePrototype, PlainDateConstructor) \
- __JS_ENUMERATE(PlainDateTime, plain_date_time, PlainDateTimePrototype, PlainDateTimeConstructor) \
- __JS_ENUMERATE(PlainTime, plain_time, PlainTimePrototype, PlainTimeConstructor) \
- __JS_ENUMERATE(TimeZone, time_zone, TimeZonePrototype, TimeZoneConstructor) \
+#define JS_ENUMERATE_TEMPORAL_OBJECTS \
+ __JS_ENUMERATE(Calendar, calendar, CalendarPrototype, CalendarConstructor) \
+ __JS_ENUMERATE(Duration, duration, DurationPrototype, DurationConstructor) \
+ __JS_ENUMERATE(Instant, instant, InstantPrototype, InstantConstructor) \
+ __JS_ENUMERATE(PlainDate, plain_date, PlainDatePrototype, PlainDateConstructor) \
+ __JS_ENUMERATE(PlainDateTime, plain_date_time, PlainDateTimePrototype, PlainDateTimeConstructor) \
+ __JS_ENUMERATE(PlainTime, plain_time, PlainTimePrototype, PlainTimeConstructor) \
+ __JS_ENUMERATE(PlainYearMonth, plain_year_month, PlainYearMonthPrototype, PlainYearMonthConstructor) \
+ __JS_ENUMERATE(TimeZone, time_zone, TimeZonePrototype, TimeZoneConstructor) \
__JS_ENUMERATE(ZonedDateTime, zoned_date_time, ZonedDateTimePrototype, ZonedDateTimeConstructor)
#define JS_ENUMERATE_ITERATOR_PROTOTYPES \
diff --git a/Userland/Libraries/LibJS/Runtime/ErrorTypes.h b/Userland/Libraries/LibJS/Runtime/ErrorTypes.h
index f704f8fbc5..200d33a9ed 100644
--- a/Userland/Libraries/LibJS/Runtime/ErrorTypes.h
+++ b/Userland/Libraries/LibJS/Runtime/ErrorTypes.h
@@ -180,6 +180,7 @@
M(TemporalInvalidPlainDate, "Invalid plain date") \
M(TemporalInvalidPlainDateTime, "Invalid plain date time") \
M(TemporalInvalidPlainTime, "Invalid plain time") \
+ M(TemporalInvalidPlainYearMonth, "Invalid plain year month") \
M(TemporalInvalidTime, "Invalid time") \
M(TemporalInvalidTimeZoneName, "Invalid time zone name") \
M(TemporalMissingRequiredProperty, "Required property {} is missing or undefined") \
diff --git a/Userland/Libraries/LibJS/Runtime/GlobalObject.cpp b/Userland/Libraries/LibJS/Runtime/GlobalObject.cpp
index 45f3f4b03e..d2fee8c659 100644
--- a/Userland/Libraries/LibJS/Runtime/GlobalObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/GlobalObject.cpp
@@ -81,6 +81,8 @@
#include <LibJS/Runtime/Temporal/PlainDateTimePrototype.h>
#include <LibJS/Runtime/Temporal/PlainTimeConstructor.h>
#include <LibJS/Runtime/Temporal/PlainTimePrototype.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonthPrototype.h>
#include <LibJS/Runtime/Temporal/Temporal.h>
#include <LibJS/Runtime/Temporal/TimeZoneConstructor.h>
#include <LibJS/Runtime/Temporal/TimeZonePrototype.h>
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
index 330e139eaa..97b7d5ac3e 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
@@ -4,10 +4,29 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
+#include <LibJS/Runtime/AbstractOperations.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/PlainDate.h>
#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
namespace JS::Temporal {
+// 9 Temporal.PlainYearMonth Objects, https://tc39.es/proposal-temporal/#sec-temporal-plainyearmonth-objects
+PlainYearMonth::PlainYearMonth(i32 iso_year, u8 iso_month, u8 iso_day, Object& calendar, Object& prototype)
+ : Object(prototype)
+ , m_iso_year(iso_year)
+ , m_iso_month(iso_month)
+ , m_iso_day(iso_day)
+ , m_calendar(calendar)
+{
+}
+
+void PlainYearMonth::visit_edges(Visitor& visitor)
+{
+ visitor.visit(&m_calendar);
+}
+
// 9.5.5 BalanceISOYearMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-balanceisoyearmonth
ISOYearMonth balance_iso_year_month(i32 year, i32 month)
{
@@ -23,4 +42,68 @@ ISOYearMonth balance_iso_year_month(i32 year, i32 month)
return ISOYearMonth { .year = year, .month = static_cast<u8>(month) };
}
+// 9.5.4 ISOYearMonthWithinLimits ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-isoyearmonthwithinlimits
+bool iso_year_month_within_limits(i32 year, u8 month)
+{
+ // 1. Assert: year and month are integers.
+
+ // 2. If year < โˆ’271821 or year > 275760, then
+ if (year < -271821 || year > 275760) {
+ // a. Return false.
+ return false;
+ }
+
+ // 3. If year is โˆ’271821 and month < 4, then
+ if (year == -271821 && month < 4) {
+ // a. Return false.
+ return false;
+ }
+
+ // 4. If year is 275760 and month > 9, then
+ if (year == 275760 && month > 9) {
+ // a. Return false.
+ return false;
+ }
+
+ // 5. Return true.
+ return true;
+}
+
+// 9.5.7 CreateTemporalYearMonth ( isoYear, isoMonth, calendar, referenceISODay [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporalyearmonth
+PlainYearMonth* create_temporal_year_month(GlobalObject& global_object, i32 iso_year, u8 iso_month, Object& calendar, u8 reference_iso_day, FunctionObject* new_target)
+{
+ auto& vm = global_object.vm();
+
+ // 1. Assert: isoYear, isoMonth, and referenceISODay are integers.
+ // 2. Assert: Type(calendar) is Object.
+
+ // 3. If ! IsValidISODate(isoYear, isoMonth, referenceISODay) is false, throw a RangeError exception.
+ if (!is_valid_iso_date(iso_year, iso_month, reference_iso_day)) {
+ vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
+ return {};
+ }
+
+ // 4. If ! ISOYearMonthWithinLimits(isoYear, isoMonth) is false, throw a RangeError exception.
+ if (!iso_year_month_within_limits(iso_year, iso_month)) {
+ vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
+ return {};
+ }
+
+ // 5. If newTarget is not present, set it to %Temporal.PlainYearMonth%.
+ if (!new_target)
+ new_target = global_object.temporal_plain_year_month_constructor();
+
+ // 6. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.PlainYearMonth.prototype%", ยซ [[InitializedTemporalYearMonth]], [[ISOYear]], [[ISOMonth]], [[ISODay]], [[Calendar]] ยป).
+ // 7. Set object.[[ISOYear]] to isoYear.
+ // 8. Set object.[[ISOMonth]] to isoMonth.
+ // 9. Set object.[[Calendar]] to calendar.
+ // 10. Set object.[[ISODay]] to referenceISODay.
+ auto* object = ordinary_create_from_constructor<PlainYearMonth>(global_object, *new_target, &GlobalObject::temporal_plain_year_month_prototype, iso_year, iso_month, reference_iso_day, calendar);
+ if (vm.exception())
+ return {};
+
+ // 11. Return object.
+ return object;
+}
+
}
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.h
index 00f3df8756..12160fd011 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.h
@@ -6,16 +6,40 @@
#pragma once
-#include <LibJS/Runtime/Temporal/AbstractOperations.h>
-#include <LibJS/Runtime/Value.h>
+#include <LibJS/Runtime/Object.h>
namespace JS::Temporal {
+class PlainYearMonth final : public Object {
+ JS_OBJECT(PlainYearMonth, Object);
+
+public:
+ PlainYearMonth(i32 iso_year, u8 iso_month, u8 iso_day, Object& calendar, Object& prototype);
+ virtual ~PlainYearMonth() override = default;
+
+ [[nodiscard]] i32 iso_year() const { return m_iso_year; }
+ [[nodiscard]] u8 iso_month() const { return m_iso_month; }
+ [[nodiscard]] u8 iso_day() const { return m_iso_day; }
+ [[nodiscard]] Object const& calendar() const { return m_calendar; }
+ [[nodiscard]] Object& calendar() { return m_calendar; }
+
+private:
+ virtual void visit_edges(Visitor&) override;
+
+ // 9.4 Properties of Temporal.PlainYearMonth Instances, https://tc39.es/proposal-temporal/#sec-properties-of-temporal-plainyearmonth-instances
+ i32 m_iso_year { 0 }; // [[ISOYear]]
+ u8 m_iso_month { 0 }; // [[ISOMonth]]
+ u8 m_iso_day { 0 }; // [[ISODay]]
+ Object& m_calendar; // [[Calendar]]
+};
+
struct ISOYearMonth {
i32 year;
u8 month;
};
ISOYearMonth balance_iso_year_month(i32 year, i32 month);
+bool iso_year_month_within_limits(i32 year, u8 month);
+PlainYearMonth* create_temporal_year_month(GlobalObject&, i32 iso_year, u8 iso_month, Object& calendar, u8 reference_iso_day, FunctionObject* new_target = nullptr);
}
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.cpp
new file mode 100644
index 0000000000..b763f7aac1
--- /dev/null
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.cpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/Calendar.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
+
+namespace JS::Temporal {
+
+// 9.1 The Temporal.PlainYearMonth Constructor, https://tc39.es/proposal-temporal/#sec-temporal-plainyearmonth-constructor
+PlainYearMonthConstructor::PlainYearMonthConstructor(GlobalObject& global_object)
+ : NativeFunction(vm().names.PlainYearMonth.as_string(), *global_object.function_prototype())
+{
+}
+
+void PlainYearMonthConstructor::initialize(GlobalObject& global_object)
+{
+ NativeFunction::initialize(global_object);
+
+ auto& vm = this->vm();
+
+ // 9.2.1 Temporal.PlainYearMonth.prototype, https://tc39.es/proposal-temporal/#sec-temporal-plainyearmonth-prototype
+ define_direct_property(vm.names.prototype, global_object.temporal_plain_year_month_prototype(), 0);
+
+ define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
+}
+
+// 9.1.1 Temporal.PlainYearMonth ( isoYear, isoMonth [ , calendarLike [ , referenceISODay ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.plainyearmonth
+Value PlainYearMonthConstructor::call()
+{
+ auto& vm = this->vm();
+
+ // 1. If NewTarget is undefined, throw a TypeError exception.
+ vm.throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, "Temporal.PlainYearMonth");
+ return {};
+}
+
+// 9.1.1 Temporal.PlainYearMonth ( isoYear, isoMonth [ , calendarLike [ , referenceISODay ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.plainyearmonth
+Value PlainYearMonthConstructor::construct(FunctionObject& new_target)
+{
+ auto& vm = this->vm();
+ auto& global_object = this->global_object();
+
+ auto iso_year = vm.argument(0);
+ auto iso_month = vm.argument(1);
+ auto calendar_like = vm.argument(2);
+ auto reference_iso_day = vm.argument(3);
+
+ // 2. If referenceISODay is undefined, then
+ if (reference_iso_day.is_undefined()) {
+ // a. Set referenceISODay to 1๐”ฝ.
+ reference_iso_day = Value(1);
+ }
+
+ // 3. Let y be ? ToIntegerOrInfinity(isoYear).
+ auto y = iso_year.to_integer_or_infinity(global_object);
+ if (vm.exception())
+ return {};
+
+ // 4. If y is +โˆž or -โˆž, throw a RangeError exception.
+ if (Value(y).is_infinity()) {
+ vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
+ return {};
+ }
+
+ // 5. Let m be ? ToIntegerOrInfinity(isoMonth).
+ auto m = iso_month.to_integer_or_infinity(global_object);
+ if (vm.exception())
+ return {};
+
+ // 6. If m is +โˆž or -โˆž, throw a RangeError exception.
+ if (Value(m).is_infinity()) {
+ vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
+ return {};
+ }
+
+ // 7. Let calendar be ? ToTemporalCalendarWithISODefault(calendarLike).
+ auto* calendar = to_temporal_calendar_with_iso_default(global_object, calendar_like);
+ if (vm.exception())
+ return {};
+
+ // 8. Let ref be ? ToIntegerOrInfinity(referenceISODay).
+ auto ref = reference_iso_day.to_integer_or_infinity(global_object);
+ if (vm.exception())
+ return {};
+
+ // 9. If ref is +โˆž or -โˆž, throw a RangeError exception.
+ if (Value(ref).is_infinity()) {
+ vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
+ return {};
+ }
+
+ // IMPLEMENTATION DEFINED: This is an optimization that allows us to treat these doubles as normal integers from this point onwards.
+ // This does not change the exposed behaviour as the call to CreateTemporalYearMonth will immediately check that these values are valid
+ // ISO values (for years: -273975 - 273975, for months: 1 - 12, for days: 1 - 31) all of which are subsets of this check.
+ if (!AK::is_within_range<i32>(y) || !AK::is_within_range<u8>(m) || !AK::is_within_range<u8>(ref)) {
+ vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
+ return {};
+ }
+
+ // 10. Return ? CreateTemporalYearMonth(y, m, calendar, ref, NewTarget).
+ return create_temporal_year_month(global_object, y, m, *calendar, ref, &new_target);
+}
+
+}
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.h
new file mode 100644
index 0000000000..3669af06ce
--- /dev/null
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthConstructor.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/NativeFunction.h>
+
+namespace JS::Temporal {
+
+class PlainYearMonthConstructor final : public NativeFunction {
+ JS_OBJECT(PlainYearMonthConstructor, NativeFunction);
+
+public:
+ explicit PlainYearMonthConstructor(GlobalObject&);
+ virtual void initialize(GlobalObject&) override;
+ virtual ~PlainYearMonthConstructor() override = default;
+
+ virtual Value call() override;
+ virtual Value construct(FunctionObject& new_target) override;
+
+private:
+ virtual bool has_constructor() const override { return true; }
+};
+
+}
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp
new file mode 100644
index 0000000000..dff105c060
--- /dev/null
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.cpp
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonthPrototype.h>
+
+namespace JS::Temporal {
+
+// 9.3 Properties of the Temporal.PlainYearMonth Prototype Object, https://tc39.es/proposal-temporal/#sec-properties-of-the-temporal-plainyearmonth-prototype-object
+PlainYearMonthPrototype::PlainYearMonthPrototype(GlobalObject& global_object)
+ : Object(*global_object.object_prototype())
+{
+}
+
+void PlainYearMonthPrototype::initialize(GlobalObject& global_object)
+{
+ Object::initialize(global_object);
+}
+
+}
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h
new file mode 100644
index 0000000000..5d1f0f5193
--- /dev/null
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonthPrototype.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/Object.h>
+
+namespace JS::Temporal {
+
+class PlainYearMonthPrototype final : public Object {
+ JS_OBJECT(PlainYearMonthPrototype, Object);
+
+public:
+ explicit PlainYearMonthPrototype(GlobalObject&);
+ virtual void initialize(GlobalObject&) override;
+ virtual ~PlainYearMonthPrototype() override = default;
+};
+
+}
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp
index b043791d49..4a010b7725 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp
@@ -12,6 +12,7 @@
#include <LibJS/Runtime/Temporal/PlainDateConstructor.h>
#include <LibJS/Runtime/Temporal/PlainDateTimeConstructor.h>
#include <LibJS/Runtime/Temporal/PlainTimeConstructor.h>
+#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
#include <LibJS/Runtime/Temporal/Temporal.h>
#include <LibJS/Runtime/Temporal/TimeZoneConstructor.h>
#include <LibJS/Runtime/Temporal/ZonedDateTimeConstructor.h>
@@ -41,6 +42,7 @@ void Temporal::initialize(GlobalObject& global_object)
define_direct_property(vm.names.PlainDate, global_object.temporal_plain_date_constructor(), attr);
define_direct_property(vm.names.PlainDateTime, global_object.temporal_plain_date_time_constructor(), attr);
define_direct_property(vm.names.PlainTime, global_object.temporal_plain_time_constructor(), attr);
+ define_direct_property(vm.names.PlainYearMonth, global_object.temporal_plain_year_month_constructor(), attr);
define_direct_property(vm.names.TimeZone, global_object.temporal_time_zone_constructor(), attr);
define_direct_property(vm.names.ZonedDateTime, global_object.temporal_zoned_date_time_constructor(), attr);
}
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.js
new file mode 100644
index 0000000000..8e48ea9670
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.js
@@ -0,0 +1,53 @@
+describe("errors", () => {
+ test("called without new", () => {
+ expect(() => {
+ Temporal.PlainYearMonth();
+ }).toThrowWithMessage(
+ TypeError,
+ "Temporal.PlainYearMonth constructor must be called with 'new'"
+ );
+ });
+
+ test("cannot pass Infinity", () => {
+ expect(() => {
+ new Temporal.PlainYearMonth(Infinity);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ expect(() => {
+ new Temporal.PlainYearMonth(0, Infinity);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ expect(() => {
+ new Temporal.PlainYearMonth(0, 0, {}, Infinity);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ expect(() => {
+ new Temporal.PlainYearMonth(-Infinity);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ expect(() => {
+ new Temporal.PlainYearMonth(0, -Infinity);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ expect(() => {
+ new Temporal.PlainYearMonth(0, 0, {}, -Infinity);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ });
+
+ test("cannot pass invalid ISO month/day", () => {
+ expect(() => {
+ new Temporal.PlainYearMonth(0, 0);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ expect(() => {
+ new Temporal.PlainYearMonth(0, 1, {}, 0);
+ }).toThrowWithMessage(RangeError, "Invalid plain year month");
+ });
+});
+
+describe("normal behavior", () => {
+ test("length is 2", () => {
+ expect(Temporal.PlainYearMonth).toHaveLength(2);
+ });
+
+ test("basic functionality", () => {
+ const plainYearMonth = new Temporal.PlainYearMonth(2021, 7);
+ expect(typeof plainYearMonth).toBe("object");
+ expect(plainYearMonth).toBeInstanceOf(Temporal.PlainYearMonth);
+ expect(Object.getPrototypeOf(plainYearMonth)).toBe(Temporal.PlainYearMonth.prototype);
+ });
+});