junit: Add Testsuites.WriteXML method

internal/gojunitreport/go-junit-report.go

@@ -64,32 +64,21 @@ func (c Config) Run(input io.Reader, output io.Writer) (*gtr.Report, error) {
 		}
 	}
 
-	if err = c.writeXML(output, report); err != nil {
+	if err = c.writeJunitXML(output, report); err != nil {
 		return nil, err
 	}
 	return &report, nil
 }
 
-func (c Config) writeXML(w io.Writer, report gtr.Report) error {
+func (c Config) writeJunitXML(w io.Writer, report gtr.Report) error {
 	testsuites := junit.CreateFromReport(report, c.Hostname)
-
 	if !c.SkipXMLHeader {
 		_, err := fmt.Fprintf(w, xml.Header)
 		if err != nil {
 			return err
 		}
 	}
-
-	enc := xml.NewEncoder(w)
-	enc.Indent("", "\t")
-	if err := enc.Encode(testsuites); err != nil {
-		return err
-	}
-	if err := enc.Flush(); err != nil {
-		return err
-	}
-	_, err := fmt.Fprintf(w, "\n")
-	return err
+	return testsuites.WriteXML(w)
 }
 
 func (c Config) gotestOptions() []gotest.Option {

junit/junit.go

@@ -5,6 +5,7 @@ package junit
 import (
 	"encoding/xml"
 	"fmt"
+	"io"
 	"strings"
 	"time"
 
@@ -36,6 +37,20 @@ func (t *Testsuites) AddSuite(ts Testsuite) {
 	t.Disabled += ts.Disabled
 }
 
+// WriteXML writes the XML representation of Testsuites t to writer w.
+func (t *Testsuites) WriteXML(w io.Writer) error {
+	enc := xml.NewEncoder(w)
+	enc.Indent("", "\t")
+	if err := enc.Encode(t); err != nil {
+		return err
+	}
+	if err := enc.Flush(); err != nil {
+		return err
+	}
+	_, err := fmt.Fprintf(w, "\n")
+	return err
+}
+
 // Testsuite is a single JUnit testsuite containing testcases.
 type Testsuite struct {
 	// required attributes

junit/junit_test.go

@@ -1,6 +1,7 @@
 package junit
 
 import (
+	"bytes"
 	"encoding/xml"
 	"testing"
 	"time"
@@ -181,3 +182,28 @@ func TestMarshalUnmarshal(t *testing.T) {
 		t.Errorf("Unmarshal result incorrect, diff (-want +got):\n%s\n", diff)
 	}
 }
+
+func TestWriteXML(t *testing.T) {
+	want := `<testsuites tests="1">
+	<testsuite name="Example" tests="1" failures="0" errors="0" id="0" time="">
+		<testcase name="Test" classname=""></testcase>
+	</testsuite>
+</testsuites>
+`
+
+	var suites Testsuites
+
+	ts := Testsuite{Name:"Example"}
+	ts.AddTestcase(Testcase{Name: "Test", })
+	suites.AddSuite(ts)
+
+	var buf bytes.Buffer
+	if err := suites.WriteXML(&buf); err != nil {
+		t.Fatalf("WriteXML failed: %v\n", err)
+	}
+
+	got := buf.String()
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("WriteXML mismatch, diff (-want +got):\n%s\n", diff)
+	}
+}