use Configuration#bucket instead of hard-coded bucket value, and some spec cleanup

spec/unit/airbrake-statsd_spec.rb

@@ -6,11 +6,26 @@ module Airbrake
     subject { Statsd }
 
     before do
-      subject.instance_variable_set('@configured', nil)
-      subject.instance_variable_set('@config', nil)
-      subject.instance_variable_set('@client', nil)
+      ['@configured', '@config', '@client'].each do |var_name|
+        subject.instance_variable_set(var_name, nil)
+      end
     end
 
+    describe '#configure' do
+      it 'sets @configured to true' do
+        subject.instance_variable_get('@configured').should_not be_true
+        subject.configure
+        subject.instance_variable_get('@configured').should be_true
+      end
+
+      context 'when block is passed' do
+        it 'passes #config to block' do
+          block = Proc.new { |conf| conf.should be_a(Statsd::Configuration) }
+          subject.configure(&block)
+        end
+      end # block passed
+    end # configure
+
     describe '#configured?' do
       context 'when #configure has been called' do
         it 'returns true' do
@@ -30,7 +45,7 @@ module Airbrake
       it 'creates new Configuration instance if not set' do
         subject.config.should be_a(Statsd::Configuration)
       end
-    end
+    end # config
 
     describe '#client' do
       it 'creates a new ::Statsd client instance if not set' do
@@ -49,23 +64,36 @@ module Airbrake
           ::Statsd.any_instance.should_receive(:namespace=).with('test').once
           subject.client
         end
-      end
-    end
+      end # namespace is set
+    end # client
 
     describe '#increment' do
       context 'when #configure has been called' do
         before { subject.configure }
 
-        it 'calls #increment on #client instance' do
-          subject.client.should_receive(:increment).once
-          subject.increment
-        end
-
-        it 'default bucket name used is "exceptions"' do
+        it 'calls #increment on #client' do
           subject.client.should_receive(:increment).with('exceptions').once
           subject.increment
         end
+
+        context 'when bucket option has been customized' do
+          before do
+            subject.configure { |config| config.bucket = 'errors' }
+          end
+
+          it 'calls #increment on #client with custom bucket' do
+            subject.client.should_receive(:increment).with('errors').once
+            subject.increment
+          end
+        end # bucket option customized
       end # configure called
+
+      context 'when #configure has not been called' do
+        it 'does not call #increment on #client' do
+          subject.client.should_not_receive(:increment)
+          subject.increment
+        end
+      end # configure not called
     end # increment
 
   end