chore: refactor plugin structure (#18335)

plugin/config_test.go

@@ -0,0 +1,20 @@
+package plugin
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfig(t *testing.T) {
+	var c *Config
+
+	g, err := c.BoolGetter(context.TODO())
+	assert.NoError(t, err)
+	assert.Nil(t, g)
+
+	s, err := c.IntSetter(context.TODO(), "foo")
+	assert.NoError(t, err)
+	assert.Nil(t, s)
+}