90 lines
3.0 KiB
Python
90 lines
3.0 KiB
Python
"""Tests for utility functions (backend/utils.py)."""
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import pytest
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from datetime import datetime, timezone, timedelta
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from utils import utc_to_ist, format_ist_timestamp
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IST = timezone(timedelta(hours=5, minutes=30))
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class TestUtcToIst:
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def test_midnight_utc_becomes_530_ist(self):
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utc = datetime(2024, 1, 1, 0, 0, 0)
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ist = utc_to_ist(utc)
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assert ist.hour == 5
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assert ist.minute == 30
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def test_adds_five_hours_thirty_minutes(self):
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utc = datetime(2024, 6, 15, 10, 0, 0)
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ist = utc_to_ist(utc)
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assert ist.hour == 15
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assert ist.minute == 30
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def test_rolls_over_to_next_day(self):
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utc = datetime(2024, 1, 1, 22, 0, 0) # 22:00 UTC → 03:30 next day IST
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ist = utc_to_ist(utc)
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assert ist.day == 2
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assert ist.hour == 3
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assert ist.minute == 30
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def test_rolls_over_to_next_month(self):
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utc = datetime(2024, 1, 31, 23, 0, 0) # Jan 31 → Feb 1 IST
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ist = utc_to_ist(utc)
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assert ist.month == 2
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assert ist.day == 1
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def test_output_has_ist_timezone_offset(self):
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utc = datetime(2024, 1, 1, 12, 0, 0)
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ist = utc_to_ist(utc)
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assert ist.utcoffset() == timedelta(hours=5, minutes=30)
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def test_preserves_seconds(self):
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utc = datetime(2024, 3, 15, 8, 45, 30)
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ist = utc_to_ist(utc)
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assert ist.second == 30
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def test_noon_utc_is_1730_ist(self):
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utc = datetime(2024, 7, 4, 12, 0, 0)
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ist = utc_to_ist(utc)
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assert ist.hour == 17
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assert ist.minute == 30
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class TestFormatIstTimestamp:
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def test_converts_z_suffix_timestamp(self):
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result = format_ist_timestamp("2024-01-01T00:00:00Z")
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assert "+05:30" in result
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def test_converts_explicit_utc_offset_timestamp(self):
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result = format_ist_timestamp("2024-01-01T00:00:00+00:00")
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assert "+05:30" in result
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def test_midnight_utc_produces_0530_ist(self):
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result = format_ist_timestamp("2024-01-01T00:00:00Z")
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assert "05:30:00+05:30" in result
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def test_noon_utc_produces_1730_ist(self):
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result = format_ist_timestamp("2024-01-01T12:00:00Z")
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assert "17:30:00+05:30" in result
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def test_returns_iso_format_string(self):
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result = format_ist_timestamp("2024-06-15T08:00:00Z")
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# Should be parseable as ISO datetime
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parsed = datetime.fromisoformat(result)
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assert parsed is not None
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def test_invalid_text_raises_value_error(self):
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with pytest.raises(ValueError):
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format_ist_timestamp("not-a-date")
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def test_invalid_month_raises_value_error(self):
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with pytest.raises(ValueError):
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format_ist_timestamp("2024-13-01T00:00:00Z")
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def test_empty_string_raises_value_error(self):
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with pytest.raises(ValueError):
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format_ist_timestamp("")
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def test_slash_separated_date_raises_value_error(self):
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with pytest.raises(ValueError):
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format_ist_timestamp("2024/01/01T00:00:00") # Slashes not valid ISO format
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