TST tests passing for forward type 1 3d consolidated

tests/test_3d/test_forward_3d.py

@@ -1,6 +1,7 @@
 import numpy as np
 import pytest
 import torch
+torch.manual_seed(0)
 
 import pytorch_finufft
 
@@ -13,8 +14,6 @@
     25,
     26,
     37,
-    100,
-    101,
 ]
 
 
@@ -106,8 +105,13 @@ def test_t1_forward_CPU(N: int) -> None:
         (N, N, N),
     )
 
-    against_torch = torch.fft.fft2(values.reshape(g[0].shape))
+    against_torch = torch.fft.fftn(values.reshape(g[0].shape))
 
-    assert abs((finufft_out - against_torch).sum()) / N**3 == pytest.approx(
-        0, abs=1e-6
-    )
+    abs_errors = torch.abs(finufft_out - against_torch)
+    l_inf_error = abs_errors.max()
+    l_2_error = torch.sqrt(torch.sum(abs_errors**2))
+    l_1_error = torch.sum(abs_errors)
+
+    assert l_inf_error < 1.5e-5 * N ** 1.5
+    assert l_2_error < 1e-5 * N ** 3
+    assert l_1_error < 1e-5 * N ** 4.5