cmd/go: convert TestListTests to the script framework

The original test has four subtests. I think it's okay to just have
one corresponding script test instead of having four different
tests.

Part of converting all tests to script framework to improve
test parallelism.

Updates #36320
Updates #17751

Change-Id: I97bc2cbb3ad5a297d7457476b8c831ee6e0f49b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/213126
Reviewed-by: Jay Conrod <jayconrod@google.com>

src/cmd/go/go_test.go

@@ -3856,24 +3856,6 @@ func main() {}`)
 	}))
 }
 
-func TestListTests(t *testing.T) {
-	tooSlow(t)
-	var tg *testgoData
-	testWith := func(listName, expected string) func(*testing.T) {
-		return func(t *testing.T) {
-			tg = testgo(t)
-			defer tg.cleanup()
-			tg.run("test", "./testdata/src/testlist/...", fmt.Sprintf("-list=%s", listName))
-			tg.grepStdout(expected, fmt.Sprintf("-test.list=%s returned %q, expected %s", listName, tg.getStdout(), expected))
-		}
-	}
-
-	t.Run("Test", testWith("Test", "TestSimple"))
-	t.Run("Bench", testWith("Benchmark", "BenchmarkSimple"))
-	t.Run("Example1", testWith("Example", "ExampleSimple"))
-	t.Run("Example2", testWith("Example", "ExampleWithEmptyOutput"))
-}
-
 func TestBuildmodePIE(t *testing.T) {
 	if testing.Short() && testenv.Builder() == "" {
 		t.Skipf("skipping in -short mode on non-builder")

src/cmd/go/testdata/script/list_test_simple.txt

@@ -0,0 +1,65 @@
+[short] skip
+
+cd $WORK
+
+# Test
+go test './gopath/src/testlist/...' -list=Test
+stdout TestSimple
+
+# Benchmark
+go test './gopath/src/testlist/...' -list=Benchmark
+stdout BenchmarkSimple
+
+# Examples
+go test './gopath/src/testlist/...' -list=Example
+stdout ExampleSimple
+stdout ExampleWithEmptyOutput
+
+-- testlist/bench_test.go --
+package testlist
+
+import (
+	"fmt"
+	"testing"
+)
+
+func BenchmarkSimplefunc(b *testing.B) {
+	b.StopTimer()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		_ = fmt.Sprint("Test for bench")
+	}
+}
+-- testlist/example_test.go --
+package testlist
+
+import (
+	"fmt"
+)
+
+func ExampleSimple() {
+	fmt.Println("Test with Output.")
+
+	// Output: Test with Output.
+}
+
+func ExampleWithEmptyOutput() {
+	fmt.Println("")
+
+	// Output:
+}
+
+func ExampleNoOutput() {
+	_ = fmt.Sprint("Test with no output")
+}
+-- testlist/test_test.go --
+package testlist
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestSimple(t *testing.T) {
+	_ = fmt.Sprint("Test simple")
+}

src/cmd/go/testdata/src/testlist/bench_test.go

@@ -1,14 +0,0 @@
-package testlist
-
-import (
-	"fmt"
-	"testing"
-)
-
-func BenchmarkSimplefunc(b *testing.B) {
-	b.StopTimer()
-	b.StartTimer()
-	for i := 0; i < b.N; i++ {
-		_ = fmt.Sprint("Test for bench")
-	}
-}

src/cmd/go/testdata/src/testlist/example_test.go

@@ -1,21 +0,0 @@
-package testlist
-
-import (
-	"fmt"
-)
-
-func ExampleSimple() {
-	fmt.Println("Test with Output.")
-
-	// Output: Test with Output.
-}
-
-func ExampleWithEmptyOutput() {
-	fmt.Println("")
-
-	// Output:
-}
-
-func ExampleNoOutput() {
-	_ = fmt.Sprint("Test with no output")
-}

src/cmd/go/testdata/src/testlist/test_test.go

@@ -1,10 +0,0 @@
-package testlist
-
-import (
-	"fmt"
-	"testing"
-)
-
-func TestSimple(t *testing.T) {
-	_ = fmt.Sprint("Test simple")
-}