code: def test_construction():
      expected = np.timedelta64(10, "D").astype("m8[ns]").view("i8")
      assert Timedelta(10, unit="d")._value == expected
      assert Timedelta(10.0, unit="d")._value == expected
      assert Timedelta("10 days")._value == expected
      assert Timedelta(days=10)._value == expected
      assert Timedelta(days=10.0)._value == expected
  
      expected += np.timedelta64(10, "s").astype("m8[ns]").view("i8")
      assert Timedelta("10 days 00:00:10")._value == expected
      assert Timedelta(days=10, seconds=10)._value == expected
      assert (
          Timedelta(days=10, milliseconds=10 * 1000)._value == expected
      )
      assert (
          Timedelta(days=10, microseconds=10 * 1000 * 1000)._value
          == expected
      )
  
      # rounding cases
      assert Timedelta(82739999850000)._value == 82739999850000
      assert "0 days 22:58:59.999850" in str(Timedelta(82739999850000))
      assert Timedelta(123072001000000)._value == 123072001000000
      assert "1 days 10:11:12.001" in str(Timedelta(123072001000000))
  
      # string conversion with/without leading zero
      # GH#9570
      assert Timedelta("0:00:00") == timedelta(hours=0)
      assert Timedelta("00:00:00") == timedelta(hours=0)
      assert Timedelta("-1:00:00") == -timedelta(hours=1)
      assert Timedelta("-01:00:00") == -timedelta(hours=1)
  
      # more strings & abbrevs
      # GH#8190
      assert Timedelta("1 h") == timedelta(hours=1)
      assert Timedelta("1 hour") == timedelta(hours=1)
      assert Timedelta("1 hr") == timedelta(hours=1)
      assert Timedelta("1 hours") == timedelta(hours=1)
      assert Timedelta("-1 hours") == -timedelta(hours=1)
      assert Timedelta("1 m") == timedelta(minutes=1)
      assert Timedelta("1.5 m") == timedelta(seconds=90)
      assert Timedelta("1 minute") == timedelta(minutes=1)
      assert Timedelta("1 minutes") == timedelta(minutes=1)
      assert Timedelta("1 s") == timedelta(seconds=1)
      assert Timedelta("1 second") == timedelta(seconds=1)
      assert Timedelta("1 seconds") == timedelta(seconds=1)
      assert Timedelta("1 ms") == timedelta(milliseconds=1)
      assert Timedelta("1 milli") == timedelta(milliseconds=1)
      assert Timedelta("1 millisecond") == timedelta(milliseconds=1)
      assert Timedelta("1 us") == timedelta(microseconds=1)
      assert Timedelta("1 µs") == timedelta(microseconds=1)
      assert Timedelta("1 micros") == timedelta(microseconds=1)
      assert Timedelta("1 microsecond") == timedelta(microseconds=1)
      assert Timedelta("1.5 microsecond") == Timedelta(
          "00:00:00.000001500"
      )
      assert Timedelta("1 ns") == Timedelta("00:00:00.000000001")
      assert Timedelta("1 nano") == Timedelta("00:00:00.000000001")
      assert Timedelta("1 nanosecond") == Timedelta(
          "00:00:00.000000001"
      )
  
      # combos
      assert Timedelta("10 days 1 hour") == timedelta(days=10, hours=1)
      assert Timedelta("10 days 1 h") == timedelta(days=10, hours=1)
      assert Timedelta("10 days 1 h 1m 1s") == timedelta(
          days=10, hours=1, minutes=1, seconds=1
      )
      assert Timedelta("-10 days 1 h 1m 1s") == -timedelta(
          days=10, hours=1, minutes=1, seconds=1
      )
      assert Timedelta("-10 days 1 h 1m 1s") == -timedelta(
          days=10, hours=1, minutes=1, seconds=1
      )
      assert Timedelta("-10 days 1 h 1m 1s 3us") == -timedelta(
          days=10, hours=1, minutes=1, seconds=1, microseconds=3
      )
      assert Timedelta("-10 days 1 h 1.5m 1s 3us") == -timedelta(
          days=10, hours=1, minutes=1, seconds=31, microseconds=3
      )
  
      # Currently invalid as it has a - on the hh:mm:dd part
      # (only allowed on the days)
      msg = "only leading negative signs are allowed"
      with pytest.raises(ValueError, match=msg):
          Timedelta("-10 days -1 h 1.5m 1s 3us")
  
      # only leading neg signs are allowed
      with pytest.raises(ValueError, match=msg):
          Timedelta("10 days -1 h 1.5m 1s 3us")
  
      # no units specified
      msg = "no units specified"
      with pytest.raises(ValueError, match=msg):
          Timedelta("3.1415")
  
      # invalid construction
      msg = "cannot construct a Timedelta"
      with pytest.raises(ValueError, match=msg):
          Timedelta()
  
      msg = "unit abbreviation w/o a number"
      with pytest.raises(ValueError, match=msg):
          Timedelta("foo")
  
      msg = (
          "cannot construct a Timedelta from "
          "the passed arguments, allowed keywords are "
      )
      with pytest.raises(ValueError, match=msg):
          Timedelta(day=10)
  
      # floats
      expected = np.timedelta64(10, "s").astype("m8[ns]").view(
          "i8"
      ) + np.timedelta64(500, "ms").astype("m8[ns]").view("i8")
      assert Timedelta(10.5, unit="s")._value == expected
  
      # offset
      assert to_timedelta(offsets.Hour(2)) == Timedelta(hours=2)
      assert Timedelta(offsets.Hour(2)) == Timedelta(hours=2)
      assert Timedelta(offsets.Second(2)) == Timedelta(seconds=2)
  
      # GH#11995: unicode
      expected = Timedelta("1h")
      result = Timedelta("1h")
      assert result == expected
      assert to_timedelta(offsets.Hour(2)) == Timedelta(
          "0 days, 02:00:00"
      )
  
      msg = "unit abbreviation w/o a number"
      with pytest.raises(ValueError, match=msg):
          Timedelta("foo bar")
  
imports: from datetime import timedelta
  from itertools import product
  import numpy
  import pytest
  from pandas._libs.tslibs import OutOfBoundsTimedelta
  from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
  from pandas import Index, NaT, Timedelta, TimedeltaIndex, offsets, to_timedelta
  import pandas._testing
label_desc: Use image node_id 7 for calling a global function with example usage: test_construction() without return types