diff --git a/debug/gdebug/gdebug_caller.go b/debug/gdebug/gdebug_caller.go
index d02ff4ab8..e5863e25f 100644
--- a/debug/gdebug/gdebug_caller.go
+++ b/debug/gdebug/gdebug_caller.go
@@ -133,16 +133,25 @@ func filterFileByFilters(file string, filters []string) (filtered bool) {
 // CallerPackage returns the package name of the caller.
 func CallerPackage() string {
 	function, _, _ := Caller()
+	// it defines a new internal function to retrieve the package name from caller function name,
+	// which is for unit testing purpose for core logic of this function.
+	return getPackageFromCallerFunction(function)
+}
+
+func getPackageFromCallerFunction(function string) string {
 	indexSplit := strings.LastIndexByte(function, '/')
 	if indexSplit == -1 {
 		return function[:strings.IndexByte(function, '.')]
-	} else {
-		leftPart := function[:indexSplit+1]
-		rightPart := function[indexSplit+1:]
-		indexDot := strings.IndexByte(function, '.')
-		rightPart = rightPart[:indexDot-1]
-		return leftPart + rightPart
 	}
+	var (
+		leftPart  = function[:indexSplit+1]
+		rightPart = function[indexSplit+1:]
+		indexDot  = strings.IndexByte(rightPart, '.')
+	)
+	if indexDot >= 0 {
+		rightPart = rightPart[:indexDot]
+	}
+	return leftPart + rightPart
 }
 
 // CallerFunction returns the function name of the caller.
diff --git a/debug/gdebug/gdebug_z_unit_internal_test.go b/debug/gdebug/gdebug_z_unit_internal_test.go
new file mode 100644
index 000000000..272141479
--- /dev/null
+++ b/debug/gdebug/gdebug_z_unit_internal_test.go
@@ -0,0 +1,26 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gdebug
+
+import (
+	"testing"
+)
+
+func Test_getPackageFromCallerFunction(t *testing.T) {
+	dataMap := map[string]string{
+		"github.com/gogf/gf/v2/test/a":       "github.com/gogf/gf/v2/test/a",
+		"github.com/gogf/gf/v2/test/a.C":     "github.com/gogf/gf/v2/test/a",
+		"github.com/gogf/gf/v2/test/aa.C":    "github.com/gogf/gf/v2/test/aa",
+		"github.com/gogf/gf/v2/test/gtest.C": "github.com/gogf/gf/v2/test/gtest",
+	}
+	for functionName, packageName := range dataMap {
+		if result := getPackageFromCallerFunction(functionName); result != packageName {
+			t.Logf(`%s != %s`, result, packageName)
+			t.Fail()
+		}
+	}
+}
diff --git a/debug/gdebug/gdebug_z_unit_test.go b/debug/gdebug/gdebug_z_unit_test.go
index 606a9c4c5..0a8b0f84f 100644
--- a/debug/gdebug/gdebug_z_unit_test.go
+++ b/debug/gdebug/gdebug_z_unit_test.go
@@ -1,3 +1,9 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
 package gdebug_test
 
 import (