Added first test of successful list metrics

lib/fog/bin/aws.rb

@@ -7,6 +7,8 @@ class AWS < Fog::Bin
         Fog::AWS::CDN
       when :cloud_formation
         Fog::AWS::CloudFormation
+      when :cloud_watch
+        Fog::AWS::CloudWatch
       when :compute
         Fog::AWS::Compute
       when :dns
@@ -38,6 +40,8 @@ class AWS < Fog::Bin
           Fog::CDN.new(:provider => 'AWS')
         when :cloud_formation
           Fog::AWS::CloudFormation.new
+        when :cloud_watch
+          Fog::AWS::CloudWatch.new
         when :compute
           Fog::Compute.new(:provider => 'AWS')
         when :dns

tests/aws/requests/cloud_watch/metric_tests.rb

@@ -0,0 +1,24 @@
+Shindo.tests('AWS::CloudWatch | metric requests', ['aws', 'cloudwatch']) do
+  
+  tests('success') do
+    @metrics_list_format = {
+      'ListMetricsResult' => {
+        'Metrics' => 
+          [{
+            'Dimensions' => 
+            [{
+              'Name' => String,
+              'Value' => String
+            }],
+            "MetricName" => String,
+            "Namespace" => String
+          }],
+      }, 
+      'ResponseMetadata' => {"RequestId"=> String}
+    }
+    
+    tests("#list_metrics").formats(@metrics_list_format) do
+      AWS[:cloud_watch].list_metrics.body
+    end
+  end
+end