[cloud][test] Use pytest conditional imports instead of nose/SkipTest (#22019)

test/units/modules/cloud/amazon/test_ec2_vpc_nat_gateway.py

@@ -1,17 +1,9 @@
-from nose.plugins.skip import SkipTest
-
-try:
-    import boto3
-    import botocore
-    HAS_BOTO3 = True
-except ImportError:
-    HAS_BOTO3 = False
-
-if not HAS_BOTO3:
-    raise SkipTest("test_ec2_vpc_nat_gateway.py requires the python module 'boto3' and 'botocore'")
-
+import pytest
 import unittest
 
+boto3 = pytest.importorskip("boto3")
+botocore = pytest.importorskip("botocore")
+
 from collections import namedtuple
 from ansible.parsing.dataloader import DataLoader
 from ansible.vars import VariableManager

test/units/modules/cloud/amazon/test_kinesis_stream.py

@@ -1,17 +1,9 @@
-from nose.plugins.skip import SkipTest
-
-try:
-    import boto3
-    import botocore
-    HAS_BOTO3 = True
-except ImportError:
-    HAS_BOTO3 = False
-
-if not HAS_BOTO3:
-    raise SkipTest("test_kinesis_stream.py requires the python module 'boto3' and 'botocore'")
-
+import pytest
 import unittest
 
+boto3 = pytest.importorskip("boto3")
+botocore = pytest.importorskip("botocore")
+
 import ansible.modules.cloud.amazon.kinesis_stream as kinesis_stream
 
 aws_region = 'us-west-2'

test/units/modules/cloud/amazon/test_lambda.py

@@ -19,15 +19,14 @@
 # Make coding more python3-ish
 from __future__ import (absolute_import, division, print_function)
 
-from nose.plugins.skip import SkipTest
+import pytest
+boto3 = pytest.importorskip("boto3")
+
 import json
 import copy
 from ansible.module_utils._text import to_bytes
 from ansible.module_utils import basic
 from ansible.compat.tests.mock import MagicMock, Mock, patch
-from ansible.module_utils.ec2 import HAS_BOTO3
-if not HAS_BOTO3:
-    raise SkipTest("test_ec2_asg.py requires the `boto3`, and `botocore` modules")
 
 # lambda is a keyword so we have to hack this.
 _temp = __import__("ansible.modules.cloud.amazon.lambda")

test/units/modules/cloud/amazon/test_s3.py

@@ -1,13 +1,5 @@
-from nose.plugins.skip import SkipTest
-
-try:
-    import boto
-    HAS_BOTO = True
-except ImportError:
-    HAS_BOTO = False
-
-if not HAS_BOTO:
-    raise SkipTest("test_s3.py requires the python module 'boto'")
+import pytest
+boto = pytest.importorskip("boto")
 
 import unittest
 import ansible.modules.cloud.amazon.s3 as s3