Scott Moser has proposed merging 
~smoser/cloud-init:cleanup/tests-and-jsonschema into cloud-init:master.

Commit message:
tests: Centralize and re-use skipTest based on json schema presense.

This just centralizes a hunk of duplicated code and uses it from the
new location.

Requested reviews:
  cloud-init commiters (cloud-init-dev)

For more details, see:
https://code.launchpad.net/~smoser/cloud-init/+git/cloud-init/+merge/341349

see commit message
-- 
Your team cloud-init commiters is requested to review the proposed merge of 
~smoser/cloud-init:cleanup/tests-and-jsonschema into cloud-init:master.
diff --git a/cloudinit/tests/helpers.py b/cloudinit/tests/helpers.py
index 41d9a8e..14c0b0b 100644
--- a/cloudinit/tests/helpers.py
+++ b/cloudinit/tests/helpers.py
@@ -409,6 +409,19 @@ except AttributeError:
         return decorator
 
 
+try:
+    import jsonschema
+    assert jsonschema  # avoid pyflakes error F401: import unused
+    _missing_jsonschema_dep = False
+except ImportError:
+    _missing_jsonschema_dep = True
+
+
+def skipUnlessJsonSchema():
+    return skipIf(
+        _missing_jsonschema_dep, "No python-jsonschema dependency present.")
+
+
 # older versions of mock do not have the useful 'assert_not_called'
 if not hasattr(mock.Mock, 'assert_not_called'):
     def __mock_assert_not_called(mmock):
diff --git a/tests/unittests/test_handler/test_handler_bootcmd.py b/tests/unittests/test_handler/test_handler_bootcmd.py
index 09d4c68..29fc25e 100644
--- a/tests/unittests/test_handler/test_handler_bootcmd.py
+++ b/tests/unittests/test_handler/test_handler_bootcmd.py
@@ -3,17 +3,11 @@
 from cloudinit.config import cc_bootcmd
 from cloudinit.sources import DataSourceNone
 from cloudinit import (distros, helpers, cloud, util)
-from cloudinit.tests.helpers import CiTestCase, mock, skipIf
+from cloudinit.tests.helpers import CiTestCase, mock, skipUnlessJsonSchema
 
 import logging
 import tempfile
 
-try:
-    import jsonschema
-    assert jsonschema  # avoid pyflakes error F401: import unused
-    _missing_jsonschema_dep = False
-except ImportError:
-    _missing_jsonschema_dep = True
 
 LOG = logging.getLogger(__name__)
 
@@ -72,7 +66,7 @@ class TestBootcmd(CiTestCase):
             "Input to shellify was type 'int'. Expected list or tuple.",
             str(context_manager.exception))
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_handler_schema_validation_warns_non_array_type(self):
         """Schema validation warns of non-array type for bootcmd key.
 
@@ -88,7 +82,7 @@ class TestBootcmd(CiTestCase):
             self.logs.getvalue())
         self.assertIn('Failed to shellify', self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, 'No python-jsonschema dependency')
+    @skipUnlessJsonSchema()
     def test_handler_schema_validation_warns_non_array_item_type(self):
         """Schema validation warns of non-array or string bootcmd items.
 
diff --git a/tests/unittests/test_handler/test_handler_ntp.py b/tests/unittests/test_handler/test_handler_ntp.py
index 28a8455..695897c 100644
--- a/tests/unittests/test_handler/test_handler_ntp.py
+++ b/tests/unittests/test_handler/test_handler_ntp.py
@@ -3,7 +3,8 @@
 from cloudinit.config import cc_ntp
 from cloudinit.sources import DataSourceNone
 from cloudinit import (distros, helpers, cloud, util)
-from cloudinit.tests.helpers import FilesystemMockingTestCase, mock, skipIf
+from cloudinit.tests.helpers import (
+    FilesystemMockingTestCase, mock, skipUnlessJsonSchema)
 
 
 import os
@@ -24,13 +25,6 @@ NTP={% for host in servers|list + pools|list %}{{ host }} {% endfor -%}
 {% endif -%}
 """
 
-try:
-    import jsonschema
-    assert jsonschema  # avoid pyflakes error F401: import unused
-    _missing_jsonschema_dep = False
-except ImportError:
-    _missing_jsonschema_dep = True
-
 
 class TestNtp(FilesystemMockingTestCase):
 
@@ -312,7 +306,7 @@ class TestNtp(FilesystemMockingTestCase):
                 content)
         self.assertNotIn('Invalid config:', self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_ntp_handler_schema_validation_warns_non_string_item_type(self):
         """Ntp schema validation warns of non-strings in pools or servers.
 
@@ -333,7 +327,7 @@ class TestNtp(FilesystemMockingTestCase):
             content = stream.read()
         self.assertEqual("servers ['valid', None]\npools [123]\n", content)
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_ntp_handler_schema_validation_warns_of_non_array_type(self):
         """Ntp schema validation warns of non-array pools or servers types.
 
@@ -354,7 +348,7 @@ class TestNtp(FilesystemMockingTestCase):
             content = stream.read()
         self.assertEqual("servers non-array\npools 123\n", content)
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_ntp_handler_schema_validation_warns_invalid_key_present(self):
         """Ntp schema validation warns of invalid keys present in ntp config.
 
@@ -378,7 +372,7 @@ class TestNtp(FilesystemMockingTestCase):
             "servers []\npools ['0.mycompany.pool.ntp.org']\n",
             content)
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_ntp_handler_schema_validation_warns_of_duplicates(self):
         """Ntp schema validation warns of duplicates in servers or pools.
 
diff --git a/tests/unittests/test_handler/test_handler_resizefs.py b/tests/unittests/test_handler/test_handler_resizefs.py
index 5aa3c49..c2a7f9f 100644
--- a/tests/unittests/test_handler/test_handler_resizefs.py
+++ b/tests/unittests/test_handler/test_handler_resizefs.py
@@ -7,21 +7,13 @@ from collections import namedtuple
 import logging
 import textwrap
 
-from cloudinit.tests.helpers import (CiTestCase, mock, skipIf, util,
-                                     wrap_and_call)
+from cloudinit.tests.helpers import (
+    CiTestCase, mock, skipUnlessJsonSchema, util, wrap_and_call)
 
 
 LOG = logging.getLogger(__name__)
 
 
-try:
-    import jsonschema
-    assert jsonschema  # avoid pyflakes error F401: import unused
-    _missing_jsonschema_dep = False
-except ImportError:
-    _missing_jsonschema_dep = True
-
-
 class TestResizefs(CiTestCase):
     with_logs = True
 
@@ -76,7 +68,7 @@ class TestResizefs(CiTestCase):
             'DEBUG: Skipping module named cc_resizefs, resizing disabled\n',
             self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_handle_schema_validation_logs_invalid_resize_rootfs_value(self):
         """The handle reports json schema violations as a warning.
 
diff --git a/tests/unittests/test_handler/test_handler_runcmd.py b/tests/unittests/test_handler/test_handler_runcmd.py
index 374c1d3..dbbb271 100644
--- a/tests/unittests/test_handler/test_handler_runcmd.py
+++ b/tests/unittests/test_handler/test_handler_runcmd.py
@@ -3,19 +3,13 @@
 from cloudinit.config import cc_runcmd
 from cloudinit.sources import DataSourceNone
 from cloudinit import (distros, helpers, cloud, util)
-from cloudinit.tests.helpers import FilesystemMockingTestCase, skipIf
+from cloudinit.tests.helpers import (
+    FilesystemMockingTestCase, skipUnlessJsonSchema)
 
 import logging
 import os
 import stat
 
-try:
-    import jsonschema
-    assert jsonschema  # avoid pyflakes error F401: import unused
-    _missing_jsonschema_dep = False
-except ImportError:
-    _missing_jsonschema_dep = True
-
 LOG = logging.getLogger(__name__)
 
 
@@ -56,7 +50,7 @@ class TestRuncmd(FilesystemMockingTestCase):
             ' /var/lib/cloud/instances/iid-datasource-none/scripts/runcmd',
             self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_handler_schema_validation_warns_non_array_type(self):
         """Schema validation warns of non-array type for runcmd key.
 
@@ -71,7 +65,7 @@ class TestRuncmd(FilesystemMockingTestCase):
             self.logs.getvalue())
         self.assertIn('Failed to shellify', self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, 'No python-jsonschema dependency')
+    @skipUnlessJsonSchema()
     def test_handler_schema_validation_warns_non_array_item_type(self):
         """Schema validation warns of non-array or string runcmd items.
 
diff --git a/tests/unittests/test_handler/test_schema.py b/tests/unittests/test_handler/test_schema.py
index df67a0e..1ecb6c6 100644
--- a/tests/unittests/test_handler/test_schema.py
+++ b/tests/unittests/test_handler/test_schema.py
@@ -6,7 +6,7 @@ from cloudinit.config.schema import (
     validate_cloudconfig_schema, main)
 from cloudinit.util import subp, write_file
 
-from cloudinit.tests.helpers import CiTestCase, mock, skipIf
+from cloudinit.tests.helpers import CiTestCase, mock, skipUnlessJsonSchema
 
 from copy import copy
 import os
@@ -14,13 +14,6 @@ from six import StringIO
 from textwrap import dedent
 from yaml import safe_load
 
-try:
-    import jsonschema
-    assert jsonschema  # avoid pyflakes error F401: import unused
-    _missing_jsonschema_dep = False
-except ImportError:
-    _missing_jsonschema_dep = True
-
 
 class GetSchemaTest(CiTestCase):
 
@@ -73,7 +66,7 @@ class ValidateCloudConfigSchemaTest(CiTestCase):
 
     with_logs = True
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_validateconfig_schema_non_strict_emits_warnings(self):
         """When strict is False validate_cloudconfig_schema emits warnings."""
         schema = {'properties': {'p1': {'type': 'string'}}}
@@ -82,7 +75,7 @@ class ValidateCloudConfigSchemaTest(CiTestCase):
             "Invalid config:\np1: -1 is not of type 'string'\n",
             self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_validateconfig_schema_emits_warning_on_missing_jsonschema(self):
         """Warning from validate_cloudconfig_schema when missing jsonschema."""
         schema = {'properties': {'p1': {'type': 'string'}}}
@@ -92,7 +85,7 @@ class ValidateCloudConfigSchemaTest(CiTestCase):
             'Ignoring schema validation. python-jsonschema is not present',
             self.logs.getvalue())
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_validateconfig_schema_strict_raises_errors(self):
         """When strict is True validate_cloudconfig_schema raises errors."""
         schema = {'properties': {'p1': {'type': 'string'}}}
@@ -102,7 +95,7 @@ class ValidateCloudConfigSchemaTest(CiTestCase):
             "Cloud config schema errors: p1: -1 is not of type 'string'",
             str(context_mgr.exception))
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_validateconfig_schema_honors_formats(self):
         """With strict True, validate_cloudconfig_schema errors on format."""
         schema = {
@@ -153,7 +146,7 @@ class ValidateCloudConfigFileTest(CiTestCase):
                 self.config_file),
             str(context_mgr.exception))
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_validateconfig_file_sctricty_validates_schema(self):
         """validate_cloudconfig_file raises errors on invalid schema."""
         schema = {
@@ -376,7 +369,7 @@ class CloudTestsIntegrationTest(CiTestCase):
     raises Warnings or errors on invalid cloud-config schema.
     """
 
-    @skipIf(_missing_jsonschema_dep, "No python-jsonschema dependency")
+    @skipUnlessJsonSchema()
     def test_all_integration_test_cloud_config_schema(self):
         """Validate schema of cloud_tests yaml files looking for warnings."""
         schema = get_schema()
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