diff --git a/hook_test.go b/hook_test.go
index 28f193d..b5cf077 100644
--- a/hook_test.go
+++ b/hook_test.go
@@ -211,6 +211,8 @@ func TestHookFireOrder(t *testing.T) {
 	h.Add(&HookCallFunc{F: func() { checkers = append(checkers, "second hook") }})
 	h.Add(&HookCallFunc{F: func() { checkers = append(checkers, "third hook") }})
 
-	h.Fire(InfoLevel, &Entry{})
+	if err := h.Fire(InfoLevel, &Entry{}); err != nil {
+		t.Error("unexpected error:", err)
+	}
 	require.Equal(t, []string{"first hook", "second hook", "third hook"}, checkers)
 }
diff --git a/logger_test.go b/logger_test.go
index 50433e6..f12a04e 100644
--- a/logger_test.go
+++ b/logger_test.go
@@ -21,7 +21,9 @@ func TestFieldValueError(t *testing.T) {
 	l.WithField("func", func() {}).Info("test")
 	fmt.Println(buf.String())
 	var data map[string]interface{}
-	json.Unmarshal(buf.Bytes(), &data)
+	if err := json.Unmarshal(buf.Bytes(), &data); err != nil {
+		t.Error("unexpected error", err)
+	}
 	_, ok := data[FieldKeyLogrusError]
 	require.True(t, ok)
 }
@@ -37,7 +39,9 @@ func TestNoFieldValueError(t *testing.T) {
 	l.WithField("str", "str").Info("test")
 	fmt.Println(buf.String())
 	var data map[string]interface{}
-	json.Unmarshal(buf.Bytes(), &data)
+	if err := json.Unmarshal(buf.Bytes(), &data); err != nil {
+		t.Error("unexpected error", err)
+	}
 	_, ok := data[FieldKeyLogrusError]
 	require.False(t, ok)
 }
diff --git a/logrus_test.go b/logrus_test.go
index 51f09a2..9c3c920 100644
--- a/logrus_test.go
+++ b/logrus_test.go
@@ -656,11 +656,14 @@ func TestEntryWriter(t *testing.T) {
 	log := New()
 	log.Out = cw
 	log.Formatter = new(JSONFormatter)
-	log.WithField("foo", "bar").WriterLevel(WarnLevel).Write([]byte("hello\n"))
+	_, err := log.WithField("foo", "bar").WriterLevel(WarnLevel).Write([]byte("hello\n"))
+	if err != nil {
+		t.Error("unexecpted error", err)
+	}
 
 	bs := <-cw
 	var fields Fields
-	err := json.Unmarshal(bs, &fields)
+	err = json.Unmarshal(bs, &fields)
 	assert.Nil(t, err)
 	assert.Equal(t, fields["foo"], "bar")
 	assert.Equal(t, fields["level"], "warning")