Functional tests, raise exceptions on query failures

2 files changed, 11 insertions, 2 deletions

diff --git a/lib/wmi-lite/wmi.rb b/lib/wmi-lite/wmi.rb
index 61fd0c3..1acc9bd 100644
--- a/lib/wmi-lite/wmi.rb
+++ b/lib/wmi-lite/wmi.rb
@@ -54,7 +54,16 @@ module WmiLite
     private
 
     def start_query(wql_query)
-      @connection.ExecQuery(wql_query)
+      result = @connection.ExecQuery(wql_query)
+      raise_if_failed(result)
+      result
+    end
+
+    def raise_if_failed(result)
+      # Attempting to access the count property of the underlying
+      # COM (OLE) object will trigger an exception if the query
+      # was unsuccessful.
+      result.count
     end
 
     def new_connection(namespace)
diff --git a/lib/wmi-lite/wmi_instance.rb b/lib/wmi-lite/wmi_instance.rb
index a6f7256..ff0e9c6 100644
--- a/lib/wmi-lite/wmi_instance.rb
+++ b/lib/wmi-lite/wmi_instance.rb
@@ -27,7 +27,7 @@ module WmiLite
       end
 
       def [](key)
-        @property_map[key]
+        @property_map[key.downcase]
       end
 
       private