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diff --git a/js/src/tests/non262/Intl/DateTimeFormat/related-year.js b/js/src/tests/non262/Intl/DateTimeFormat/related-year.js
new file mode 100644
index 0000000000..2c2e111d0a
--- /dev/null
+++ b/js/src/tests/non262/Intl/DateTimeFormat/related-year.js
@@ -0,0 +1,185 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+const {
+    Era, Year, YearName, RelatedYear, Month, Day, Literal
+} = DateTimeFormatParts
+
+const tests = [
+    // Test with non-leap month.
+    {
+        date: new Date("2020-04-23T00:00:00Z"),
+        options: {},
+        calendar: "chinese",
+        locales: {
+            "en": [Month("4"), Literal("/"), Day("1"), Literal("/"), RelatedYear("2020")],
+            "de": [Day("1"), Literal("."), Month("4"), Literal("."), Year("37")],
+            "ja": [YearName("庚子"), Literal("年"), Month("4"), Literal("月"), Day("1"), Literal("日")],
+            "zh": [RelatedYear("2020"), Literal("年"), Month("四月"), Day("1")],
+            "ar": [RelatedYear("٢٠٢٠"), Literal("-"), Month("٠٤"), Literal("-"), Day("٠١")],
+        }
+    },
+
+    // Test with leap month.
+    {
+        date: new Date("2020-05-23T00:00:00Z"),
+        options: {},
+        calendar: "chinese",
+        locales: {
+            "en": [Month("4bis"), Literal("/"), Day("1"), Literal("/"), RelatedYear("2020")],
+            "de": [Day("1"), Literal("."), Month("4bis"), Literal("."), Year("37")],
+            "ja": [YearName("庚子"), Literal("年"), Month("閏4"), Literal("月"), Day("1"), Literal("日")],
+            "zh": [RelatedYear("2020"), Literal("年"), Month("闰四月"), Day("1")],
+            "ar": [RelatedYear("٢٠٢٠"), Literal("-"), Month("٠٤bis"), Literal("-"), Day("٠١")],
+        }
+    },
+
+    // Display only "year" field.
+    {
+        date: new Date("2020-04-23T00:00:00Z"),
+        options: {year: "numeric"},
+        calendar: "chinese",
+        locales: {
+            "en": [RelatedYear("2020"), Literal("("), YearName("geng-zi"), Literal(")")],
+            "de": [YearName("geng-zi")],
+            "ja": [YearName("庚子"), Literal("年")],
+            "zh": [RelatedYear("2020"), YearName("庚子"), Literal("年")],
+            "ar": [Year("٣٧")],
+        }
+    },
+
+    // Display only "month" field.
+    {
+        date: new Date("2020-04-23T00:00:00Z"),
+        options: {month: "long"},
+        calendar: "chinese",
+        locales: {
+            "en": [Month("Fourth Month")],
+            "de": [Month("M04")],
+            "ja": [Month("四月")],
+            "zh": [Month("四月")],
+            "ar": [Month("M04")],
+        }
+    },
+
+    // Display only "month" field. (Leap month)
+    {
+        date: new Date("2020-05-23T00:00:00Z"),
+        options: {month: "long"},
+        calendar: "chinese",
+        locales: {
+            "en": [Month("Fourth Monthbis")],
+            "de": [Month("M04bis")],
+            "ja": [Month("閏四月")],
+            "zh": [Month("闰四月")],
+            "ar": [Month("M04bis")],
+        }
+    },
+
+    // Display "year" and "month" fields.
+    {
+        date: new Date("2020-04-23T00:00:00Z"),
+        options: {year: "numeric", month: "long"},
+        calendar: "chinese",
+        locales: {
+            "en": [Month("Fourth Month"), Literal(" "), RelatedYear("2020"), Literal("("), YearName("geng-zi"), Literal(")")],
+            "de": [Month("M04"), Literal(" "), YearName("geng-zi")],
+            "ja": [YearName("庚子"), Literal("年"), Month("四月")],
+            "zh": [RelatedYear("2020"), YearName("庚子"), Literal("年"), Month("四月")],
+            "ar": [RelatedYear("٢٠٢٠"), Literal("("), YearName("geng-zi"), Literal(") "), Month("M04")],
+        }
+    },
+
+    // Display "year" and "month" fields. (Leap month)
+    {
+        date: new Date("2020-05-23T00:00:00Z"),
+        options: {year: "numeric", month: "long"},
+        calendar: "chinese",
+        locales: {
+            "en": [Month("Fourth Monthbis"), Literal(" "), RelatedYear("2020"), Literal("("), YearName("geng-zi"), Literal(")")],
+            "de": [Month("M04bis"), Literal(" "), YearName("geng-zi")],
+            "ja": [YearName("庚子"), Literal("年"), Month("閏四月")],
+            "zh": [RelatedYear("2020"), YearName("庚子"), Literal("年"), Month("闰四月")],
+            "ar": [RelatedYear("٢٠٢٠"), Literal("("), YearName("geng-zi"), Literal(") "), Month("M04bis")],
+        }
+    },
+
+    // Related year in traditional Korean calendar.
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "dangi",
+        locales: {
+            "en": [Month("11"), Literal("/"), Day("26"), Literal("/"), RelatedYear("2018")],
+            "ko": [RelatedYear("2018"), Literal(". "), Month("11"), Literal(". "), Day("26"), Literal(".")],
+        }
+    },
+
+    // Allowing the calendar to modify the pattern selection choice can result in falling back to
+    // the root locale patterns in more cases. That can result in displaying the era field by
+    // default, among other things.
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "buddhist",
+        locales: {
+            "en": [Month("1"), Literal("/"), Day("1"), Literal("/"), Year("2562"), Literal(" "), Era("BE")],
+            "th": [Day("1"), Literal("/"), Month("1"), Literal("/"), Year("2562")],
+        }
+    },
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "hebrew",
+        locales: {
+            "en": [Day("24"), Literal(" "), Month("Tevet"), Literal(" "), Year("5779")],
+            "he": [Day("24"), Literal(" ב"), Month("טבת"), Literal(" "), Year("5779")],
+            "fr": [Day("24"), Literal("/"), Month("4"), Literal("/"), Year("5779"), Literal(" "), Era("A. M.")],
+        }
+    },
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "islamic",
+        locales: {
+            "en": [Month("4"), Literal("/"), Day("25"), Literal("/"), Year("1440"), Literal(" "), Era("AH")],
+            "ar": [Day("٢٥"), Literal("\u200F/"), Month("٤"), Literal("\u200F/"), Year("١٤٤٠"), Literal(" "), Era("هـ")],
+        }
+    },
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "japanese",
+        locales: {
+            "en": [Month("1"), Literal("/"), Day("1"), Literal("/"), Year("31"), Literal(" "), Era("H")],
+            "ja": [Era("H"), Year("31"), Literal("/"), Month("1"), Literal("/"), Day("1")],
+        }
+    },
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "persian",
+        locales: {
+            "en": [Month("10"), Literal("/"), Day("11"), Literal("/"), Year("1397"), Literal(" "), Era("AP")],
+            "fa": [Year("۱۳۹۷"), Literal("/"), Month("۱۰"), Literal("/"), Day("۱۱")],
+        }
+    },
+    {
+        date: new Date("2019-01-01T00:00:00Z"),
+        options: {},
+        calendar: "roc",
+        locales: {
+            "en": [Month("1"), Literal("/"), Day("1"), Literal("/"), Year("108"), Literal(" "), Era("Minguo")],
+            "zh-Hant-TW": [Era("民國"), Year("108"), Literal("/"), Month("1"), Literal("/"), Day("1")],
+        }
+    },
+];
+
+for (let {date, options, calendar, locales} of tests) {
+    for (let [locale, result] of Object.entries(locales)) {
+        let df = new Intl.DateTimeFormat(`${locale}-u-ca-${calendar}`, {timeZone: "UTC", ...options});
+        assertParts(df, date, result);
+    }
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, "ok");