cmd/go: convert TestCoverageNoStatements to the script framework.

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

Updates #36320
Updates #17751

Change-Id: Ie2c60ec0654ef605439beeed92cf5f1c2c8a1dd3
Reviewed-on: https://go-review.googlesource.com/c/go/+/213681
Reviewed-by: Jay Conrod <jayconrod@google.com>

src/cmd/go/go_test.go

@@ -2045,14 +2045,6 @@ func TestCoverageRuns(t *testing.T) {
 	checkCoverage(tg, data)
 }
 
-func TestCoverageNoStatements(t *testing.T) {
-	tooSlow(t)
-	tg := testgo(t)
-	defer tg.cleanup()
-	tg.run("test", "-cover", "./testdata/testcover/pkg4")
-	tg.grepStdout("[no statements]", "expected [no statements] for pkg4")
-}
-
 func TestTestEmpty(t *testing.T) {
 	if !canRace {
 		t.Skip("no race detector")

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

@@ -0,0 +1,57 @@
+[short] skip
+go test -cover ./pkg1 ./pkg2 ./pkg3 ./pkg4
+stdout 'pkg1	\[no test files\]'
+stdout 'pkg2	\S+	coverage: 0.0% of statements \[no tests to run\]'
+stdout 'pkg3	\S+	coverage: 100.0% of statements'
+stdout 'pkg4	\S+	coverage: \[no statements\]'
+
+-- pkg1/a.go --
+package pkg1
+
+import "fmt"
+
+func F() {
+	fmt.Println("pkg1")
+}
+-- pkg2/a.go --
+package pkg2
+
+import "fmt"
+
+func F() {
+	fmt.Println("pkg2")
+}
+-- pkg2/a_test.go --
+package pkg2
+-- pkg3/a.go --
+package pkg3
+
+import "fmt"
+
+func F() {
+	fmt.Println("pkg3")
+}
+-- pkg3/a_test.go --
+package pkg3
+
+import "testing"
+
+func TestF(t *testing.T) {
+	F()
+}
+-- pkg4/a.go --
+package pkg4
+
+type T struct {
+	X bool
+}
+-- pkg4/a_test.go --
+package pkg4
+
+import (
+	"testing"
+)
+
+func TestT(t *testing.T) {
+	_ = T{}
+}

src/cmd/go/testdata/testcover/pkg1/a.go

@@ -1,7 +0,0 @@
-package pkg1
-
-import "fmt"
-
-func F() {
-	fmt.Println("pkg1")
-}

src/cmd/go/testdata/testcover/pkg2/a.go

@@ -1,7 +0,0 @@
-package pkg2
-
-import "fmt"
-
-func F() {
-	fmt.Println("pkg2")
-}

src/cmd/go/testdata/testcover/pkg2/a_test.go

@@ -1 +0,0 @@
-package pkg2

src/cmd/go/testdata/testcover/pkg3/a.go

@@ -1,7 +0,0 @@
-package pkg3
-
-import "fmt"
-
-func F() {
-	fmt.Println("pkg3")
-}

src/cmd/go/testdata/testcover/pkg3/a_test.go

@@ -1,7 +0,0 @@
-package pkg3
-
-import "testing"
-
-func TestF(t *testing.T) {
-	F()
-}

src/cmd/go/testdata/testcover/pkg4/a.go

@@ -1,5 +0,0 @@
-package pkg4
-
-type T struct {
-	X bool
-}

src/cmd/go/testdata/testcover/pkg4/a_test.go

@@ -1,9 +0,0 @@
-package pkg4
-
-import (
-	"testing"
-)
-
-func TestT(t *testing.T) {
-	_ = T{}
-}