1 files changed, 88 insertions, 0 deletions
diff --git a/tests/date/test_add.py b/tests/date/test_add.py
new file mode 100644
index 0000000..a435f46
--- /dev/null
+++ b/tests/date/test_add.py
@@ -0,0 +1,88 @@
+from __future__ import annotations
+
+from datetime import timedelta
+
+import pytest
+
+import pendulum
+
+from tests.conftest import assert_date
+
+
+def test_add_years_positive():
+    assert pendulum.date(1975, 1, 1).add(years=1).year == 1976
+
+
+def test_add_years_zero():
+    assert pendulum.date(1975, 1, 1).add(years=0).year == 1975
+
+
+def test_add_years_negative():
+    assert pendulum.date(1975, 1, 1).add(years=-1).year == 1974
+
+
+def test_add_months_positive():
+    assert pendulum.date(1975, 12, 1).add(months=1).month == 1
+
+
+def test_add_months_zero():
+    assert pendulum.date(1975, 12, 1).add(months=0).month == 12
+
+
+def test_add_months_negative():
+    assert pendulum.date(1975, 12, 1).add(months=-1).month == 11
+
+
+def test_add_month_with_overflow():
+    assert pendulum.Date(2012, 1, 31).add(months=1).month == 2
+
+
+def test_add_days_positive():
+    assert pendulum.Date(1975, 5, 31).add(days=1).day == 1
+
+
+def test_add_days_zero():
+    assert pendulum.Date(1975, 5, 31).add(days=0).day == 31
+
+
+def test_add_days_negative():
+    assert pendulum.Date(1975, 5, 31).add(days=-1).day == 30
+
+
+def test_add_weeks_positive():
+    assert pendulum.Date(1975, 5, 21).add(weeks=1).day == 28
+
+
+def test_add_weeks_zero():
+    assert pendulum.Date(1975, 5, 21).add(weeks=0).day == 21
+
+
+def test_add_weeks_negative():
+    assert pendulum.Date(1975, 5, 21).add(weeks=-1).day == 14
+
+
+def test_add_timedelta():
+    delta = timedelta(days=18)
+    d = pendulum.date(2015, 3, 14)
+
+    new = d + delta
+    assert isinstance(new, pendulum.Date)
+    assert_date(new, 2015, 4, 1)
+
+
+def test_add_duration():
+    duration = pendulum.duration(years=2, months=3, days=18)
+    d = pendulum.Date(2015, 3, 14)
+
+    new = d + duration
+    assert_date(new, 2017, 7, 2)
+
+
+def test_addition_invalid_type():
+    d = pendulum.date(2015, 3, 14)
+
+    with pytest.raises(TypeError):
+        d + 3
+
+    with pytest.raises(TypeError):
+        3 + d