Report stores a slice of Property structs rather than a map, to mimic JUnit properties, which have a deterministic ordering and allow multipler properties with the same name.

junit/junit.go

@@ -144,8 +144,8 @@ func CreateFromReport(report gtr.Report, hostname string) Testsuites {
 			suite.SetTimestamp(pkg.Timestamp)
 		}
 
-		for k, v := range pkg.Properties {
-			suite.AddProperty(k, v)
+		for _, p := range pkg.Properties {
+			suite.AddProperty(p.Name, p.Value)
 		}
 
 		if len(pkg.Output) > 0 {

junit/junit_test.go

@@ -19,7 +19,7 @@ func TestCreateFromReport(t *testing.T) {
 				Duration:   1 * time.Second,
 				Coverage:   0.9,
 				Output:     []string{"output"},
-				Properties: map[string]string{"go.version": "go1.18"},
+				Properties: []gtr.Property{{Name: "go.version", Value: "go1.18"}},
 				Tests: []gtr.Test{
 					{
 						Name:   "TestPass",