chore: add more tests (#3018)

core/logx/vars.go

@@ -1,6 +1,10 @@
 package logx
 
-import "errors"
+import (
+	"errors"
+
+	"github.com/zeromicro/go-zero/core/syncx"
+)
 
 const (
 	// DebugLevel logs everything
@@ -61,6 +65,8 @@ var (
 	ErrLogPathNotSet = errors.New("log path must be set")
 	// ErrLogServiceNameNotSet is an error that indicates that the service name is not set.
 	ErrLogServiceNameNotSet = errors.New("log service name must be set")
+	// ExitOnFatal defines whether to exit on fatal errors, defined here to make it easier to test.
+	ExitOnFatal = syncx.ForAtomicBool(true)
 
 	truncatedField = Field(truncatedKey, true)
 )