Add breaking test that requires reverting #673

viper_test.go

@@ -1856,6 +1856,23 @@ func TestWatchFile(t *testing.T) {
 
 }
 
+func TestUnmarshal_DotSeparatorBackwardCompatibility(t *testing.T) {
+	flags := pflag.NewFlagSet("test", pflag.ContinueOnError)
+	flags.String("foo.bar", "cobra_flag", "")
+
+	v := New()
+	assert.NoError(t, v.BindPFlags(flags))
+
+	config := &struct {
+		Foo struct {
+			Bar string
+		}
+	}{}
+
+	assert.NoError(t, v.Unmarshal(config))
+	assert.Equal(t, "cobra_flag", config.Foo.Bar)
+}
+
 func BenchmarkGetBool(b *testing.B) {
 	key := "BenchmarkGetBool"
 	v = New()