From dfa57f1b71434f2c26c0e233cfd349613fc3f21b Mon Sep 17 00:00:00 2001
From: Antoine Toulme <antoine@lunar-ocean.com>
Date: Thu, 14 Mar 2024 13:25:06 -0700
Subject: [PATCH] bring back test in config as well

---
 component/config_test.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/component/config_test.go b/component/config_test.go
index 79651959108..fea4ba04221 100644
--- a/component/config_test.go
+++ b/component/config_test.go
@@ -11,6 +11,8 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/collector/confmap"
 )
 
 var _ fmt.Stringer = Type{}
@@ -417,3 +419,27 @@ func TestNewType(t *testing.T) {
 		})
 	}
 }
+
+type configWithEmbeddedStruct struct {
+	String                      string `mapstructure:"string"`
+	Num                         int    `mapstructure:"num"`
+	EmbeddedUnmarshallingConfig `mapstructure:",squash"`
+}
+
+type EmbeddedUnmarshallingConfig struct {
+}
+
+func (euc *EmbeddedUnmarshallingConfig) Unmarshal(_ *confmap.Conf) error {
+	return nil // do nothing.
+}
+func TestStructWithEmbeddedUnmarshaling(t *testing.T) {
+	cfgMap := confmap.NewFromStringMap(map[string]any{
+		"string": "foo",
+		"num":    123,
+	})
+	tc := &configWithEmbeddedStruct{}
+	err := UnmarshalConfig(cfgMap, tc)
+	require.NoError(t, err)
+	assert.Equal(t, "foo", tc.String)
+	assert.Equal(t, 123, tc.Num)
+}