Unit testing of meta_ast.py

This patch adds a unit test and also Replaces report() with
__str__ so it just returns a string rather than printing to stdout.

Coverage goes from 44% to 100%.

Change-Id: I23af0e09415651a2caaf82f327d3106ff5db65ad

bandit/bandit.py

@@ -227,7 +227,7 @@ def main():
     # initiate execution of tests within Bandit Manager
     b_mgr.run_tests()
     if args.debug:
-        b_mgr.output_metaast()
+        print(b_mgr.b_ma)
 
     # trigger output of results by Bandit Manager
     b_mgr.output_results(args.context_lines, args.severity - 1,

bandit/core/manager.py

@@ -130,10 +130,6 @@ class BanditManager():
             output_filename=output_filename, output_format=output_format
         )
 
-    def output_metaast(self):
-        '''Outputs all the nodes from the Meta AST.'''
-        self.b_ma.report()
-
     def discover_files(self, targets, recursive=False):
         '''Add tests directly and from a directory to the test set
 

bandit/core/meta_ast.py

@@ -40,15 +40,15 @@ class BanditMetaAst():
             'raw': node, 'parent_id': parent_id, 'depth': depth
         }
 
-    def report(self):
+    def __str__(self):
         '''Dumps a listing of all of the nodes
 
-        Dumps (prints) a listing of all of the nodes for debugging purposes
+        Dumps a listing of all of the nodes for debugging purposes
         :return: -
         '''
         tmpstr = ""
         for k, v in self.nodes.items():
             tmpstr += "Node: %s\n" % k
             tmpstr += "\t%s\n" % str(v)
-        tmpstr += "Length : %s\n" % len(self.nodes)
-        print(tmpstr)
+        tmpstr += "Length: %s\n" % len(self.nodes)
+        return tmpstr

tests/unit/core/test_meta_ast.py

@@ -0,0 +1,41 @@
+# Copyright (c) 2015 VMware, Inc.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License. You may obtain
+#  a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#  License for the specific language governing permissions and limitations
+#  under the License.
+
+import six
+import testtools
+
+from bandit.core import meta_ast
+
+
+class BanditMetaAstTests(testtools.TestCase):
+
+    def setUp(self):
+        super(BanditMetaAstTests, self).setUp()
+        self.b_meta_ast = meta_ast.BanditMetaAst()
+        self.node = 'fake_node'
+        self.parent_id = 'fake_parent_id'
+        self.depth = 1
+        self.b_meta_ast.add_node(self.node, self.parent_id, self.depth)
+        self.node_id = hex(id(self.node))
+
+    def test_add_node(self):
+        expected = {'raw': self.node,
+                    'parent_id': self.parent_id,
+                    'depth': self.depth}
+        self.assertEqual(expected, self.b_meta_ast.nodes[self.node_id])
+
+    def test_str(self):
+        node = self.b_meta_ast.nodes[self.node_id]
+        expected = 'Node: %s\n\t%s\nLength: 1\n' % (self.node_id, node)
+        self.assertEqual(expected, six.text_type(self.b_meta_ast))