Add short-with-failure format

README.md

@@ -39,6 +39,8 @@ gotestsum --format short-verbose
 Supported formats:
  * `dots` - output one character per test.
  * `short` (default) - output a line for each test package.
+ * `short-with-failures` - like short, but prints test output as soon as a test
+   fails.
  * `standard-quiet` - the default `go test` format.
  * `short-verbose` - output a line for each test and package.
  * `standard-verbose` - the standard `go test -v` format.

testjson/format.go

@@ -123,6 +123,10 @@ func shortFormat(event TestEvent, exec *Execution) (string, error) {
 	if !event.PackageEvent() {
 		return "", nil
 	}
+	return shortFormatPackageEvent(event, exec)
+}
+
+func shortFormatPackageEvent(event TestEvent, exec *Execution) (string, error) {
 	pkg := exec.Package(event.Package)
 
 	fmtElapsed := func() string {
@@ -161,6 +165,16 @@ func shortFormat(event TestEvent, exec *Execution) (string, error) {
 	return "", nil
 }
 
+func shortWithFailuresFormat(event TestEvent, exec *Execution) (string, error) {
+	if !event.PackageEvent() {
+		if event.Action == ActionFail {
+			return exec.Output(event.Package, event.Test), nil
+		}
+		return "", nil
+	}
+	return shortFormatPackageEvent(event, exec)
+}
+
 func dotsFormat(event TestEvent, exec *Execution) (string, error) {
 	pkg := exec.Package(event.Package)
 	withColor := colorEvent(event)
@@ -207,6 +221,8 @@ func NewEventFormatter(format string) EventFormatter {
 		return shortVerboseFormat
 	case "short":
 		return shortFormat
+	case "short-with-failures":
+		return shortWithFailuresFormat
 	default:
 		return nil
 	}