From 48136fb4881393465b11e9bb7521712311beeefa Mon Sep 17 00:00:00 2001
From: Jonah Scheinerman <jonah@scheinerman.net>
Date: Wed, 11 Dec 2024 12:31:35 -0500
Subject: [PATCH] Tests

---
 packages/datetime2/karma.conf.js              |  1 +
 .../test/components/datePicker3Tests.tsx      | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/packages/datetime2/karma.conf.js b/packages/datetime2/karma.conf.js
index cd949b02cd..46e1233087 100644
--- a/packages/datetime2/karma.conf.js
+++ b/packages/datetime2/karma.conf.js
@@ -33,4 +33,5 @@ module.exports = async function (config) {
             },
         }),
     );
+    process.env.TZ = 'Etc/UTC';
 };
diff --git a/packages/datetime2/test/components/datePicker3Tests.tsx b/packages/datetime2/test/components/datePicker3Tests.tsx
index 4e060ac28c..29874abcb3 100644
--- a/packages/datetime2/test/components/datePicker3Tests.tsx
+++ b/packages/datetime2/test/components/datePicker3Tests.tsx
@@ -801,6 +801,16 @@ describe("<DatePicker3>", () => {
     });
 
     describe("clearing a selection", () => {
+        const MOCK_TODAY = new Date(2024, 11, 24, 16, 30);
+        let clock: sinon.SinonFakeTimers;
+        beforeEach(() => {
+            clock = sinon.useFakeTimers(MOCK_TODAY);
+        });
+
+        afterEach(() => {
+            clock.restore();
+        });
+
         it("onChange correctly passes a Date and never null when canClearSelection is false", () => {
             const onChange = sinon.spy();
             const { getDay } = wrap(<DatePicker3 {...LOCALE_LOADER} canClearSelection={false} onChange={onChange} />);
@@ -845,6 +855,19 @@ describe("<DatePicker3>", () => {
             assert.equal(value!.getFullYear(), today.getFullYear());
         });
 
+        it("selects the current day in the given timezone when Today is clicked", () => {
+            const { root } = wrap(<DatePicker3 {...LOCALE_LOADER} showActionsBar={true} timezone="Asia/Tokyo" />);
+            root.find({ className: Classes.DATEPICKER_FOOTER }).find(Button).first().simulate("click");
+
+            const value = root.state("value")!;
+            assert.isNotNull(value);
+            assert.equal(value.getDate(), MOCK_TODAY.getDate() + 1);
+            assert.equal(value.getMonth(), MOCK_TODAY.getMonth());
+            assert.equal(value.getFullYear(), MOCK_TODAY.getFullYear());
+            assert.equal(value.getHours(), 1);
+            assert.equal(value.getMinutes(), 30);
+        });
+
         it("clears the value when Clear is clicked", () => {
             const { getDay, root } = wrap(<DatePicker3 {...LOCALE_LOADER} showActionsBar={true} />);
             getDay().simulate("click");