Pass stdin to go test

cmd/main.go

@@ -356,6 +356,7 @@ func startGoTest(ctx context.Context, args []string) (*proc, error) {
 	}
 
 	cmd := exec.CommandContext(ctx, args[0], args[1:]...)
+	cmd.Stdin = os.Stdin
 	p := proc{cmd: cmd}
 	log.Debugf("exec: %s", cmd.Args)
 	var err error

cmd/main_test.go

@@ -2,10 +2,12 @@ package cmd
 
 import (
 	"bytes"
+	"encoding/json"
 	"os"
 	"os/exec"
 	"strings"
 	"testing"
+	"time"
 
 	"gotest.tools/v3/assert"
 	"gotest.tools/v3/env"
@@ -399,3 +401,44 @@ func TestRun_RerunFails_PanicPreventsRerun(t *testing.T) {
 	err := run(opts)
 	assert.ErrorContains(t, err, "rerun aborted because previous run had a suspected panic", out.String())
 }
+
+func TestExecStdin(t *testing.T) {
+	stdin := os.Stdin
+	t.Cleanup(func() { os.Stdin = stdin })
+
+	r, w, err := os.Pipe()
+	assert.NilError(t, err)
+	defer r.Close()
+
+	os.Stdin = r
+
+	go func() {
+		defer w.Close()
+		e := json.NewEncoder(w)
+		for _, event := range []struct {
+			Time    *time.Time `json:",omitempty"`
+			Action  string
+			Package string  `json:",omitempty"`
+			Test    string  `json:",omitempty"`
+			Elapsed float64 `json:",omitempty"`
+			Output  string  `json:",omitempty"`
+		}{
+			{Action: "run", Package: "pkg"},
+			{Action: "run", Package: "pkg", Test: "TestOne"},
+			{Action: "fail", Package: "pkg", Test: "TestOne"},
+			{Action: "fail", Package: "pkg"},
+		} {
+			assert.NilError(t, e.Encode(event))
+		}
+	}()
+
+	assert.NilError(t, run(&options{
+		args:        []string{"cat"},
+		format:      "testname",
+		hideSummary: newHideSummaryValue(),
+		rawCommand:  true,
+
+		stdout: os.Stdout,
+		stderr: os.Stderr,
+	}))
+}