Changing utils.py to test_utils.py (Project-MONAI#8335)

Related to Project-MONAI#8185.

### Description

This changes the name of `tests/utils.py` to `tests/test_utils.py` to
conform to the changes introduced with the daily CICD tests. This is
done in Project-MONAI#8231 but the change is being pre-merged now to get tests
working again while issues are sorted out there. This also includes
changes this PR made to that file, and changes anywhere else to
correctly import the module.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Eric Kerfoot <eric.kerfoot@kcl.ac.uk>
Signed-off-by: Can-Zhao <volcanofly@gmail.com>

Author: ericspod

tests/croppers.py

@@ -20,7 +20,7 @@
 from monai.transforms import Randomizable
 from monai.transforms.lazy.functional import apply_pending
 from monai.transforms.transform import MapTransform
-from tests.utils import TEST_NDARRAYS_ALL, assert_allclose
+from tests.test_utils import TEST_NDARRAYS_ALL, assert_allclose
 
 
 class CropTest(unittest.TestCase):

tests/hvd_evenly_divisible_all_gather.py

@@ -15,7 +15,7 @@
 
 from monai.utils import evenly_divisible_all_gather
 from monai.utils.module import optional_import
-from tests.utils import assert_allclose
+from tests.test_utils import assert_allclose
 
 hvd, has_hvd = optional_import("horovod", name="torch")
 

tests/lazy_transforms_utils.py

@@ -16,7 +16,7 @@
 from monai.data import MetaTensor, set_track_meta
 from monai.transforms import InvertibleTransform, MapTransform, Randomizable
 from monai.transforms.lazy.functional import apply_pending
-from tests.utils import assert_allclose
+from tests.test_utils import assert_allclose
 
 apply_transforms_kwargs = ("pending", "mode", "padding_mode", "dtype", "align_corners")
 

tests/ngc_bundle_download.py

@@ -24,7 +24,7 @@
 from monai.bundle import download, load
 from monai.config import print_debug_info
 from monai.networks.utils import copy_model_state
-from tests.utils import assert_allclose, skip_if_downloading_fails, skip_if_quick, skip_if_windows
+from tests.test_utils import assert_allclose, skip_if_downloading_fails, skip_if_quick, skip_if_windows
 
 TEST_CASE_NGC_1 = [
     "spleen_ct_segmentation",

tests/padders.py

@@ -21,7 +21,7 @@
 from monai.transforms.lazy.functional import apply_pending
 from monai.transforms.transform import MapTransform
 from monai.utils.enums import NumpyPadMode, PytorchPadMode
-from tests.utils import TEST_NDARRAYS_ALL, assert_allclose
+from tests.test_utils import TEST_NDARRAYS_ALL, assert_allclose
 
 MODES = []
 # Test modes

tests/test_activations.py

@@ -18,7 +18,7 @@
 
 from monai.networks.layers.factories import Act
 from monai.transforms import Activations
-from tests.utils import TEST_NDARRAYS, assert_allclose
+from tests.test_utils import TEST_NDARRAYS, assert_allclose
 
 TEST_CASES = []
 for p in TEST_NDARRAYS:

tests/test_activationsd.py

@@ -17,7 +17,7 @@
 from parameterized import parameterized
 
 from monai.transforms import Activationsd
-from tests.utils import TEST_NDARRAYS, assert_allclose
+from tests.test_utils import TEST_NDARRAYS, assert_allclose
 
 TEST_CASES = []
 for p in TEST_NDARRAYS:

tests/test_add_coordinate_channels.py

@@ -18,7 +18,7 @@
 from parameterized import parameterized
 
 from monai.transforms import AddCoordinateChannels
-from tests.utils import TEST_NDARRAYS, assert_allclose
+from tests.test_utils import TEST_NDARRAYS, assert_allclose
 
 TESTS, TEST_CASES_ERROR_1, TEST_CASES_ERROR_2 = [], [], []
 for p in TEST_NDARRAYS:

tests/test_add_coordinate_channelsd.py

@@ -18,7 +18,7 @@
 from parameterized import parameterized
 
 from monai.transforms import AddCoordinateChannelsd
-from tests.utils import TEST_NDARRAYS, assert_allclose
+from tests.test_utils import TEST_NDARRAYS, assert_allclose
 
 TESTS, TEST_CASES_ERROR_1, TEST_CASES_ERROR_2 = [], [], []
 for p in TEST_NDARRAYS:

tests/test_add_extreme_points_channel.py

@@ -17,7 +17,7 @@
 from parameterized import parameterized
 
 from monai.transforms import AddExtremePointsChannel
-from tests.utils import TEST_NDARRAYS, assert_allclose
+from tests.test_utils import TEST_NDARRAYS, assert_allclose
 
 IMG_CHANNEL = 3
 TESTS = []