diff --git a/test/built-ins/Temporal/PlainDate/prototype/daysInMonth/basic.js b/test/built-ins/Temporal/PlainDate/prototype/daysInMonth/basic.js
new file mode 100644
index 0000000000..fb2cc1cdf9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/daysInMonth/basic.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plaindate.prototype.daysinmonth
+description: Checking days in month for a "normal" case (non-undefined, non-boundary case, etc.)
+features: [Temporal]
+---*/
+
+const tests = [
+  [new Temporal.PlainDate(1976, 2, 18), 29],
+  [new Temporal.PlainDate(1976, 11, 18), 30],
+  [new Temporal.PlainDate(1976, 12, 18), 31],
+  [new Temporal.PlainDate(1977, 2, 18), 28],
+];
+for (const [plainDate, expected] of tests) {
+  assert.sameValue(plainDate.daysInMonth, expected, `${expected} days in the month of ${plainDate}`);
+}
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/basic.js b/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/basic.js
index 7059e7a0cb..76fcea4223 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/basic.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/daysInMonth/basic.js
@@ -7,6 +7,12 @@ description: Checking days in month for a "normal" case (non-undefined, non-boun
 features: [Temporal]
 ---*/
 
-const calendar = Temporal.Calendar.from("iso8601");
-const datetime = new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789, calendar);
-assert.sameValue(datetime.daysInMonth, 30, "check days in month information");
+const tests = [
+  [new Temporal.PlainDateTime(1976, 2, 18, 15, 23, 30, 123, 456, 789), 29],
+  [new Temporal.PlainDateTime(1976, 11, 18, 15, 23, 30, 123, 456, 789), 30],
+  [new Temporal.PlainDateTime(1976, 12, 18, 15, 23, 30, 123, 456, 789), 31],
+  [new Temporal.PlainDateTime(1977, 2, 18, 15, 23, 30, 123, 456, 789), 28],
+];
+for (const [plainDateTime, expected] of tests) {
+  assert.sameValue(plainDateTime.daysInMonth, expected, `${expected} days in the month of ${plainDateTime}`);
+}
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js
index 94883e5868..c8977a2807 100644
--- a/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js
@@ -7,5 +7,12 @@ description: daysInMonth works
 features: [Temporal]
 ---*/
 
-const ym = new Temporal.PlainYearMonth(1976, 11);
-assert.sameValue(ym.daysInMonth, 30);
+const tests = [
+  [new Temporal.PlainYearMonth(1976, 2), 29],
+  [new Temporal.PlainYearMonth(1976, 11), 30],
+  [new Temporal.PlainYearMonth(1976, 12), 31],
+  [new Temporal.PlainYearMonth(1977, 2), 28],
+];
+for (const [plainYearMonth, expected] of tests) {
+  assert.sameValue(plainYearMonth.daysInMonth, expected, `${expected} days in the month of ${plainYearMonth}`);
+}