chore: add calculator reference test

tests/test_server_time.py

@@ -0,0 +1,110 @@
+import pytest
+
+from hypothesis import given, strategies as st
+from datetime import datetime, timedelta
+
+from dzgui.views.dialogs.calc import (
+    LocalClock,
+    ServerClock,
+    Time,
+    TimePicker,
+    DAY_START_TIME,
+    DAY_END_TIME,
+)
+
+pytestmark = pytest.mark.FOO
+
+
+class DummyEmitter:
+    pass
+
+
+@pytest.fixture(params=[("05:00", 10.0), ("15:30", 5.0)])
+def accel_server_clock(request) -> None:
+    clock_time, expect = request.param
+    cur_time = Time(clock_time, 5.0, 2.0)
+    emitter = DummyEmitter()
+    local_clock = LocalClock(emitter)
+    server_clock = ServerClock(cur_time, emitter, local_clock)
+    return expect, server_clock
+
+
+def test_accel_factor(accel_server_clock) -> None:
+    """Static test checking times at known boundaries"""
+    expect, clock = accel_server_clock
+    assert clock.get_accel_factor(clock.cur_time) == expect
+
+
+def reference_calc(start, end, day_factor, night_factor):
+    """
+    Reference implementation to test validity of UI-side calculator
+    Aggregates total seconds and applies accel factors after
+    """
+    day_start = datetime.combine(start.date(), DAY_START_TIME)
+    day_end = datetime.combine(start.date(), DAY_END_TIME)
+    night_factor = day_factor * night_factor
+
+    if end < start:
+        end += timedelta(days=1)
+
+    day_max = max(start, day_start)
+    day_min = min(end, day_end)
+
+    next_day_start = datetime.combine(end.date(), DAY_START_TIME)
+    next_day_end = datetime.combine(end.date(), DAY_END_TIME)
+
+    range1 = (day_end - day_max).total_seconds()
+    range2 = (min(end, next_day_end) - next_day_start).total_seconds()
+
+    if end.date() > start.date():
+        day_seconds = max(0, range1) + max(0, range2)
+    else:
+        day_seconds = max(0, (day_min - day_max).total_seconds())
+
+    total_seconds = (end - start).total_seconds()
+    night_seconds = (total_seconds - day_seconds) / night_factor
+    day_seconds = day_seconds / day_factor
+    total = night_seconds + day_seconds
+
+    return timedelta(seconds=total)
+
+
+day_accel = st.floats(
+    min_value=1.0, max_value=24.0, allow_nan=False, allow_infinity=False
+)
+night_accel = st.floats(
+    min_value=1.0, max_value=64.0, allow_nan=False, allow_infinity=False
+)
+
+
+@st.composite
+def time_ranges(draw):
+    start_time = draw(st.times())
+    deltas = st.timedeltas(min_value=timedelta(0), max_value=timedelta(days=1))
+    duration = draw(deltas)
+
+    start = datetime.combine(datetime.now(), start_time)
+    end = start + duration
+    return start, end
+
+
+@given(span=time_ranges(), day_factor=day_accel, night_factor=night_accel)
+def test_time_aggregation(span, day_factor, night_factor) -> None:
+    start, end = span
+
+    strtime = start.strftime("%H:%M")
+    t = Time(strtime, day_factor, night_factor)
+    emitter = DummyEmitter()
+    local_clock = LocalClock(emitter)
+    server_clock = ServerClock(t, emitter, local_clock)
+    h = end.time().hour
+    m = end.time().minute
+    picker = TimePicker(h, m)
+
+    # NOTE: truncates microseconds to mimic widget HH:MM selection behavior
+    start = server_clock.get_datetime()
+    end = picker.get_time()
+    actual = server_clock.calc_delta(end)
+    expect = reference_calc(start, end, day_factor, night_factor)
+
+    assert actual == expect