Revert "ENH: infer freq in timedelta_range (pandas-dev#32377)"

This reverts commit d219c2c.

Author: simonjayhawkins

pandas/_testing.py

@@ -841,9 +841,9 @@ def repr_class(x):
             raise_assert_detail(obj, msg, repr_class(left), repr_class(right))
 
 
-def assert_attr_equal(attr: str, left, right, obj: str = "Attributes"):
+def assert_attr_equal(attr, left, right, obj="Attributes"):
     """
-    Check attributes are equal. Both objects must have attribute.
+    checks attributes are equal. Both objects must have attribute.
 
     Parameters
     ----------

pandas/core/arrays/timedeltas.py

@@ -264,10 +264,6 @@ def _generate_range(cls, start, end, periods, freq, closed=None):
             index = generate_regular_range(start, end, periods, freq)
         else:
             index = np.linspace(start.value, end.value, periods).astype("i8")
-            if len(index) >= 2:
-                # Infer a frequency
-                td = Timedelta(index[1] - index[0])
-                freq = to_offset(td)
 
         if not left_closed:
             index = index[1:]
@@ -620,10 +616,6 @@ def __floordiv__(self, other):
             if self.freq is not None:
                 # Note: freq gets division, not floor-division
                 freq = self.freq / other
-                if freq.nanos == 0 and self.freq.nanos != 0:
-                    # e.g. if self.freq is Nano(1) then dividing by 2
-                    #  rounds down to zero
-                    freq = None
             return type(self)(result.view("m8[ns]"), freq=freq)
 
         if not hasattr(other, "dtype"):

pandas/tests/indexes/timedeltas/test_timedelta_range.py

@@ -38,7 +38,6 @@ def test_linspace_behavior(self, periods, freq):
         result = timedelta_range(start="0 days", end="4 days", periods=periods)
         expected = timedelta_range(start="0 days", end="4 days", freq=freq)
         tm.assert_index_equal(result, expected)
-        assert result.freq == freq
 
     def test_errors(self):
         # not enough params