create any missing directories for {json,junit}file

If the directory can not be created then the file creation operation will fail
as it did before.

No reason to force someone to create this directory ahead of time.

cmd/handler.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"os"
 	"os/exec"
+	"path/filepath"
 
 	"github.com/pkg/errors"
 	"gotest.tools/gotestsum/internal/junitxml"
@@ -68,6 +69,7 @@ func newEventHandler(opts *options) (*eventHandler, error) {
 	}
 	var err error
 	if opts.jsonFile != "" {
+		_ = os.MkdirAll(filepath.Dir(opts.jsonFile), 0o755)
 		handler.jsonFile, err = os.Create(opts.jsonFile)
 		if err != nil {
 			return handler, errors.Wrap(err, "failed to open JSON file")
@@ -80,6 +82,7 @@ func writeJUnitFile(opts *options, execution *testjson.Execution) error {
 	if opts.junitFile == "" {
 		return nil
 	}
+	_ = os.MkdirAll(filepath.Dir(opts.junitFile), 0o755)
 	junitFile, err := os.Create(opts.junitFile)
 	if err != nil {
 		return fmt.Errorf("failed to open JUnit file: %v", err)

cmd/handler_test.go

@@ -4,12 +4,14 @@ import (
 	"bytes"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
 	"gotest.tools/gotestsum/testjson"
 	"gotest.tools/v3/assert"
 	"gotest.tools/v3/env"
+	"gotest.tools/v3/fs"
 	"gotest.tools/v3/golden"
 )
 
@@ -85,3 +87,36 @@ func TestEventHandler_Event_MaxFails(t *testing.T) {
 	_, err := testjson.ScanTestOutput(cfg)
 	assert.Error(t, err, "ending test run because max failures was reached")
 }
+
+func TestNewEventHandler_CreatesDirectory(t *testing.T) {
+	dir := fs.NewDir(t, t.Name())
+	jsonFile := filepath.Join(dir.Path(), "new-path", "log.json")
+
+	opts := &options{
+		stdout:   new(bytes.Buffer),
+		format:   "testname",
+		jsonFile: jsonFile,
+	}
+	_, err := newEventHandler(opts)
+	assert.NilError(t, err)
+
+	_, err = os.Stat(jsonFile)
+	assert.NilError(t, err)
+}
+
+func TestWriteJunitFile_CreatesDirectory(t *testing.T) {
+	dir := fs.NewDir(t, t.Name())
+	junitFile := filepath.Join(dir.Path(), "new-path", "junit.xml")
+
+	opts := &options{
+		junitFile:                    junitFile,
+		junitTestCaseClassnameFormat: &junitFieldFormatValue{},
+		junitTestSuiteNameFormat:     &junitFieldFormatValue{},
+	}
+	exec := &testjson.Execution{}
+	err := writeJUnitFile(opts, exec)
+	assert.NilError(t, err)
+
+	_, err = os.Stat(junitFile)
+	assert.NilError(t, err)
+}

go.mod

@@ -15,4 +15,4 @@ require (
 	gotest.tools/v3 v3.0.3
 )
 
-go 1.11
+go 1.13