add metadata decode unit test

Signed-off-by: Bernd Verst <4535280+berndverst@users.noreply.github.com>

metadata/utils.go

@@ -128,12 +128,13 @@ func GetMetadataProperty(props map[string]string, keys ...string) (val string, o
 
 // DecodeMetadata decodes metadata into a struct
 // This is an extension of mitchellh/mapstructure which also supports decoding durations
-func DecodeMetadata(input map[string]string, result interface{}) error {
+func DecodeMetadata(input interface{}, result interface{}) error {
 	decoder, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
 		DecodeHook: mapstructure.ComposeDecodeHookFunc(
 			toTimeDurationHookFunc()),
-		Metadata: nil,
-		Result:   &result,
+		Metadata:         nil,
+		Result:           result,
+		WeaklyTypedInput: true,
 	})
 	if err != nil {
 		return err

metadata/utils_test.go

@@ -14,7 +14,9 @@ limitations under the License.
 package metadata
 
 import (
+	"fmt"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -91,3 +93,34 @@ func TestTryGetContentType(t *testing.T) {
 		assert.Equal(t, true, ok)
 	})
 }
+
+func TestMetadataDecode(t *testing.T) {
+	t.Run("Test metadata decoding", func(t *testing.T) {
+		type testMetadata struct {
+			Mystring   string   `json:"mystring"`
+			Myduration Duration `json:"myduration"`
+			Myinteger  int      `json:"myinteger,string"`
+			Myfloat64  float64  `json:"myfloat64,string"`
+			Mybool     *bool    `json:"mybool,omitempty"`
+		}
+
+		var m testMetadata
+
+		testData := make(map[string]string)
+		testData["mystring"] = "test"
+		testData["myduration"] = "3s"
+		testData["myinteger"] = "1"
+		testData["myfloat64"] = "1.1"
+		testData["mybool"] = "true"
+
+		err := DecodeMetadata(testData, &m)
+		fmt.Println(testData)
+
+		assert.Nil(t, err)
+		assert.Equal(t, true, *m.Mybool)
+		assert.Equal(t, "test", m.Mystring)
+		assert.Equal(t, 1, m.Myinteger)
+		assert.Equal(t, 1.1, m.Myfloat64)
+		assert.Equal(t, Duration{Duration: 3 * time.Second}, m.Myduration)
+	})
+}