hooks: add null logger test

README.md

@@ -441,20 +441,22 @@ Logrus has a built in facility for asserting the presence of log messages. This
 
 ```go
 import(
-  "testing"
+  "github.com/sirupsen/logrus"
   "github.com/sirupsen/logrus/hooks/null"
+  "github.com/stretchr/testify/assert"
+  "testing"
 )
 
 func TestSomething(t*testing.T){
   logger, hook := null.NewNullLogger()
   logger.Error("Helloerror")
 
-  assert.Equal(1, len(hook.Entries))
+  assert.Equal(t, 1, len(hook.Entries))
-  assert.Equal(logrus.ErrorLevel, hook.LastEntry().Level)
+  assert.Equal(t, logrus.ErrorLevel, hook.LastEntry().Level)
-  assert.Equal("Hello error", hook.LastEntry().Message)
+  assert.Equal(t, "Helloerror", hook.LastEntry().Message)
 
   hook.Reset()
-  assert.Nil(hook.LastEntry())
+  assert.Nil(t, hook.LastEntry())
 }
 ```
 

hooks/null/null_test.go

@@ -0,0 +1,19 @@
+package null
+
+import (
+	"github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestNullLogger(t *testing.T) {
+	logger, hook := NewNullLogger()
+	logger.Error("Helloerror")
+
+	assert.Equal(t, 1, len(hook.Entries))
+	assert.Equal(t, logrus.ErrorLevel, hook.LastEntry().Level)
+	assert.Equal(t, "Helloerror", hook.LastEntry().Message)
+
+	hook.Reset()
+	assert.Nil(t, hook.LastEntry())
+}