From 2a0fb0cdf03418b316bc41b5732215d57073f3db Mon Sep 17 00:00:00 2001
From: sabiwara <sabiwara@gmail.com>
Date: Fri, 23 May 2025 17:55:59 +0900
Subject: [PATCH 1/4] Add tests for Time.to_iso8601/2

---
 lib/elixir/test/elixir/calendar/time_test.exs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/elixir/test/elixir/calendar/time_test.exs b/lib/elixir/test/elixir/calendar/time_test.exs
index 4577daf61e0..1435b39271e 100644
--- a/lib/elixir/test/elixir/calendar/time_test.exs
+++ b/lib/elixir/test/elixir/calendar/time_test.exs
@@ -38,6 +38,18 @@ defmodule TimeTest do
     end
   end
 
+  test "to_iso8601/2" do
+    time1 = ~T[23:00:07.005]
+    assert Time.to_iso8601(time1) == "23:00:07.005"
+    assert Time.to_iso8601(Map.from_struct(time1)) == "23:00:07.005"
+    assert Time.to_iso8601(time1, :basic) == "230007.005"
+
+    time2 = ~T[23:00:07.005 Calendar.Holocene]
+    assert Time.to_iso8601(time2) == "23:00:07.005"
+    assert Time.to_iso8601(Map.from_struct(time2)) == "23:00:07.005"
+    assert Time.to_iso8601(time2, :basic) == "230007.005"
+  end
+
   test "to_string/1" do
     time = ~T[23:00:07.005]
     assert to_string(time) == "23:00:07.005"

From 86650a66b0609c331b6f8ef1f1a25823bf0d4668 Mon Sep 17 00:00:00 2001
From: sabiwara <sabiwara@gmail.com>
Date: Fri, 23 May 2025 18:01:33 +0900
Subject: [PATCH 2/4] Add tests for Time.compare/2 with different calendars

---
 lib/elixir/test/elixir/calendar/time_test.exs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/elixir/test/elixir/calendar/time_test.exs b/lib/elixir/test/elixir/calendar/time_test.exs
index 1435b39271e..b58e370e252 100644
--- a/lib/elixir/test/elixir/calendar/time_test.exs
+++ b/lib/elixir/test/elixir/calendar/time_test.exs
@@ -77,6 +77,11 @@ defmodule TimeTest do
     assert Time.compare(time1, time2) == :eq
     assert Time.compare(time1, time3) == :lt
     assert Time.compare(time3, time2) == :gt
+
+    time1_holocene = ~T[01:01:01.005 Calendar.Holocene]
+    assert Time.compare(time1_holocene, time1) == :eq
+    assert Time.compare(time1_holocene, time2) == :eq
+    assert Time.compare(time1_holocene, time3) == :lt
   end
 
   test "before?/2 and after?/2" do

From c9b74a0b80bcaa16be71a0a5e6bc5e364e6a402d Mon Sep 17 00:00:00 2001
From: sabiwara <sabiwara@gmail.com>
Date: Fri, 23 May 2025 18:07:43 +0900
Subject: [PATCH 3/4] Add tests for Time.diff/3

---
 lib/elixir/test/elixir/calendar/time_test.exs | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/lib/elixir/test/elixir/calendar/time_test.exs b/lib/elixir/test/elixir/calendar/time_test.exs
index b58e370e252..65c82a4048c 100644
--- a/lib/elixir/test/elixir/calendar/time_test.exs
+++ b/lib/elixir/test/elixir/calendar/time_test.exs
@@ -95,6 +95,26 @@ defmodule TimeTest do
     assert not Time.after?(time1, time2)
   end
 
+  test "diff/3" do
+    time1 = ~T[05:02:01.234]
+    time2 = ~T[10:00:04.123]
+    time1_holocene = ~T[05:02:01.234 Calendar.Holocene]
+
+    assert Time.diff(time1, time2) == -17883
+    assert Time.diff(time1, time2, :hour) == -4
+    assert Time.diff(time1, time2, :minute) == -298
+    assert Time.diff(time1, time2, :second) == -17883
+    assert Time.diff(time1, time2, :millisecond) == -17_882_889
+    assert Time.diff(time1, time2, :microsecond) == -17_882_889_000
+
+    assert Time.diff(time1_holocene, time2) == -17883
+    assert Time.diff(time1_holocene, time2, :hour) == -4
+    assert Time.diff(time1_holocene, time2, :minute) == -298
+    assert Time.diff(time1_holocene, time2, :second) == -17883
+    assert Time.diff(time1_holocene, time2, :millisecond) == -17_882_889
+    assert Time.diff(time1_holocene, time2, :microsecond) == -17_882_889_000
+  end
+
   test "truncate/2" do
     assert Time.truncate(~T[01:01:01.123456], :microsecond) == ~T[01:01:01.123456]
 

From 97c5378cdde32f358075251626bdd5a5c9b37727 Mon Sep 17 00:00:00 2001
From: sabiwara <sabiwara@gmail.com>
Date: Fri, 23 May 2025 18:11:39 +0900
Subject: [PATCH 4/4] Test Time.shift/2 with invalid values

---
 lib/elixir/test/elixir/calendar/time_test.exs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/elixir/test/elixir/calendar/time_test.exs b/lib/elixir/test/elixir/calendar/time_test.exs
index 65c82a4048c..2818e755117 100644
--- a/lib/elixir/test/elixir/calendar/time_test.exs
+++ b/lib/elixir/test/elixir/calendar/time_test.exs
@@ -165,5 +165,13 @@ defmodule TimeTest do
     assert_raise ArgumentError,
                  "cannot shift time by date scale unit. Expected :hour, :minute, :second, :microsecond",
                  fn -> Time.shift(time, %Duration{day: 1}) end
+
+    assert_raise ArgumentError,
+                 "unsupported value nil for :minute. Expected an integer",
+                 fn -> Time.shift(time, minute: nil) end
+
+    assert_raise ArgumentError,
+                 ~r/unsupported value 1 for :microsecond. Expected a tuple \{ms, precision\}/,
+                 fn -> Time.shift(time, microsecond: 1) end
   end
 end