tests: don't test git or aws if required modules are too old or not i…

…nstalled

poni/cloud_aws.py

@@ -38,8 +38,10 @@
     import boto.ec2.blockdevicemapping
     import boto.exception
     import boto.vpc
+    boto_is_current = LooseVersion(boto.Version) >= BOTO_REQUIREMENT
 except ImportError:
     boto = None
+    boto_is_current = False
 
 
 def convert_boto_errors(method):
@@ -314,7 +316,7 @@ def get_provider_key(cls, cloud_prop):
 
     def __init__(self, cloud_prop):
         assert boto, "boto is not installed, cannot access AWS"
-        assert LooseVersion(boto.Version) >= BOTO_REQUIREMENT, "boto version is too old, cannot access AWS"
+        assert boto_is_current, "boto version is too old, cannot access AWS"
         cloudbase.Provider.__init__(self, AWS_EC2, cloud_prop)
         self.log = logging.getLogger(AWS_EC2)
         self.region = cloud_prop["region"]

tests/test_cloud_aws_comparison.py

@@ -1,7 +1,10 @@
-from poni import cloud
+from nose import SkipTest
+from poni import cloud, cloud_aws
 
 def test_hash():
     """validate aws provider hash and comparison implementation"""
+    if not cloud_aws.boto_is_current:
+        raise SkipTest("boto is not installed or is too old")
     sky = cloud.Sky()
     east_prop = dict(provider="aws-ec2", region="us-east-1")
     east1 = sky.get_provider(east_prop)

tests/test_vc.py

@@ -1,8 +1,15 @@
-from poni import tool
+from nose import SkipTest
+from poni import tool, vc
 from helper import *
 import subprocess
 
+
 class TestVersionControl(Helper):
+    @classmethod
+    def setupClass(cls):
+        if not vc.git:
+            raise SkipTest("GitPython not installed or too old")
+
     def git(self, repo, cmd):
         full_cmd = ["git",
                     "--git-dir=%s/.git" % repo,
@@ -39,4 +46,3 @@ def test_checkpoint(self):
         assert not poni.run(["vc", "checkpoint", "checkpoint changes"])
         assert self.git(repo, ["status", "-s"]) == ""
         assert "checkpoint changes" in self.git(repo, ["log"])
-