1 files changed, 252 insertions, 0 deletions
diff --git a/tests/date/test_start_end_of.py b/tests/date/test_start_end_of.py
new file mode 100644
index 0000000..f1b4412
--- /dev/null
+++ b/tests/date/test_start_end_of.py
@@ -0,0 +1,252 @@
+from __future__ import annotations
+
+import pytest
+
+import pendulum
+
+from pendulum import Date
+from tests.conftest import assert_date
+
+
+def test_start_of_day():
+    d = Date.today()
+    new = d.start_of("day")
+    assert isinstance(new, Date)
+    assert_date(new, d.year, d.month, d.day)
+
+
+def test_end_of_day():
+    d = Date.today()
+    new = d.end_of("day")
+    assert isinstance(new, Date)
+    assert_date(new, d.year, d.month, d.day)
+
+
+def test_start_of_week():
+    d = Date(2016, 10, 20)
+    new = d.start_of("week")
+    assert isinstance(new, Date)
+    assert_date(new, d.year, d.month, 17)
+
+
+def test_end_of_week():
+    d = Date(2016, 10, 20)
+    new = d.end_of("week")
+    assert isinstance(new, Date)
+    assert_date(new, d.year, d.month, 23)
+
+
+def test_start_of_month_is_fluid():
+    d = Date.today()
+    assert isinstance(d.start_of("month"), Date)
+
+
+def test_start_of_month_from_now():
+    d = Date.today()
+    new = d.start_of("month")
+    assert_date(new, d.year, d.month, 1)
+
+
+def test_start_of_month_from_last_day():
+    d = Date(2000, 1, 31)
+    new = d.start_of("month")
+    assert_date(new, 2000, 1, 1)
+
+
+def test_start_of_year_is_fluid():
+    d = Date.today()
+    new = d.start_of("year")
+    assert isinstance(new, Date)
+
+
+def test_start_of_year_from_now():
+    d = Date.today()
+    new = d.start_of("year")
+    assert_date(new, d.year, 1, 1)
+
+
+def test_start_of_year_from_first_day():
+    d = Date(2000, 1, 1)
+    new = d.start_of("year")
+    assert_date(new, 2000, 1, 1)
+
+
+def test_start_of_year_from_last_day():
+    d = Date(2000, 12, 31)
+    new = d.start_of("year")
+    assert_date(new, 2000, 1, 1)
+
+
+def test_end_of_month_is_fluid():
+    d = Date.today()
+    assert isinstance(d.end_of("month"), Date)
+
+
+def test_end_of_month_from_now():
+    d = Date.today().start_of("month")
+    new = d.start_of("month")
+    assert_date(new, d.year, d.month, 1)
+
+
+def test_end_of_month():
+    d = Date(2000, 1, 1).end_of("month")
+    new = d.end_of("month")
+    assert_date(new, 2000, 1, 31)
+
+
+def test_end_of_month_from_last_day():
+    d = Date(2000, 1, 31)
+    new = d.end_of("month")
+    assert_date(new, 2000, 1, 31)
+
+
+def test_end_of_year_is_fluid():
+    d = Date.today()
+    assert isinstance(d.end_of("year"), Date)
+
+
+def test_end_of_year_from_now():
+    d = Date.today().end_of("year")
+    new = d.end_of("year")
+    assert_date(new, d.year, 12, 31)
+
+
+def test_end_of_year_from_first_day():
+    d = Date(2000, 1, 1)
+    new = d.end_of("year")
+    assert_date(new, 2000, 12, 31)
+
+
+def test_end_of_year_from_last_day():
+    d = Date(2000, 12, 31)
+    new = d.end_of("year")
+    assert_date(new, 2000, 12, 31)
+
+
+def test_start_of_decade_is_fluid():
+    d = Date.today()
+    assert isinstance(d.start_of("decade"), Date)
+
+
+def test_start_of_decade_from_now():
+    d = Date.today()
+    new = d.start_of("decade")
+    assert_date(new, d.year - d.year % 10, 1, 1)
+
+
+def test_start_of_decade_from_first_day():
+    d = Date(2000, 1, 1)
+    new = d.start_of("decade")
+    assert_date(new, 2000, 1, 1)
+
+
+def test_start_of_decade_from_last_day():
+    d = Date(2009, 12, 31)
+    new = d.start_of("decade")
+    assert_date(new, 2000, 1, 1)
+
+
+def test_end_of_decade_is_fluid():
+    d = Date.today()
+    assert isinstance(d.end_of("decade"), Date)
+
+
+def test_end_of_decade_from_now():
+    d = Date.today()
+    new = d.end_of("decade")
+    assert_date(new, d.year - d.year % 10 + 9, 12, 31)
+
+
+def test_end_of_decade_from_first_day():
+    d = Date(2000, 1, 1)
+    new = d.end_of("decade")
+    assert_date(new, 2009, 12, 31)
+
+
+def test_end_of_decade_from_last_day():
+    d = Date(2009, 12, 31)
+    new = d.end_of("decade")
+    assert_date(new, 2009, 12, 31)
+
+
+def test_start_of_century_is_fluid():
+    d = Date.today()
+    assert isinstance(d.start_of("century"), Date)
+
+
+def test_start_of_century_from_now():
+    d = Date.today()
+    new = d.start_of("century")
+    assert_date(new, d.year - d.year % 100 + 1, 1, 1)
+
+
+def test_start_of_century_from_first_day():
+    d = Date(2001, 1, 1)
+    new = d.start_of("century")
+    assert_date(new, 2001, 1, 1)
+
+
+def test_start_of_century_from_last_day():
+    d = Date(2100, 12, 31)
+    new = d.start_of("century")
+    assert_date(new, 2001, 1, 1)
+
+
+def test_end_of_century_is_fluid():
+    d = Date.today()
+    assert isinstance(d.end_of("century"), Date)
+
+
+def test_end_of_century_from_now():
+    now = Date.today()
+    d = now.end_of("century")
+    assert_date(d, now.year - now.year % 100 + 100, 12, 31)
+
+
+def test_end_of_century_from_first_day():
+    d = Date(2001, 1, 1)
+    new = d.end_of("century")
+    assert_date(new, 2100, 12, 31)
+
+
+def test_end_of_century_from_last_day():
+    d = Date(2100, 12, 31)
+    new = d.end_of("century")
+    assert_date(new, 2100, 12, 31)
+
+
+def test_average_is_fluid():
+    d = Date.today().average()
+    assert isinstance(d, Date)
+
+
+def test_average_from_same():
+    d1 = pendulum.date(2000, 1, 31)
+    d2 = pendulum.date(2000, 1, 31).average(d1)
+    assert_date(d2, 2000, 1, 31)
+
+
+def test_average_from_greater():
+    d1 = pendulum.date(2000, 1, 1)
+    d2 = pendulum.date(2009, 12, 31).average(d1)
+    assert_date(d2, 2004, 12, 31)
+
+
+def test_average_from_lower():
+    d1 = pendulum.date(2009, 12, 31)
+    d2 = pendulum.date(2000, 1, 1).average(d1)
+    assert_date(d2, 2004, 12, 31)
+
+
+def test_start_of():
+    d = pendulum.date(2013, 3, 31)
+
+    with pytest.raises(ValueError):
+        d.start_of("invalid")
+
+
+def test_end_of_invalid_unit():
+    d = pendulum.date(2013, 3, 31)
+
+    with pytest.raises(ValueError):
+        d.end_of("invalid")