cmd/go: convert tests using testdata/src/syntaxerror to scripts

This includes TestMatchesNoTestsDoesNotOverrideBuildFailure
and TestErrorMessageForSyntaxErrorInTestGoFileSaysFAIL.
Convert the tests that use the testdata/src/syntaxerror directory
to the script framework.

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

Updates #36320
Updates #17751

Change-Id: I2b2b616e8c124996ae8c8e5b737f15bb493ec588
Reviewed-on: https://go-review.googlesource.com/c/go/+/212816
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

src/cmd/go/go_test.go

@@ -1217,15 +1217,6 @@ func TestAccidentalGitCheckout(t *testing.T) {
 	}
 }
 
-func TestErrorMessageForSyntaxErrorInTestGoFileSaysFAIL(t *testing.T) {
-	tg := testgo(t)
-	defer tg.cleanup()
-	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
-	tg.runFail("test", "syntaxerror")
-	tg.grepStderr("x_test.go:", "did not diagnose error")
-	tg.grepStdout("FAIL", "go test did not say FAIL")
-}
-
 func TestWildcardsDoNotLookInUselessDirectories(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
@@ -3812,16 +3803,6 @@ func TestMatchesNoTests(t *testing.T) {
 	tg.grepBoth(noMatchesPattern, "go test did not say [no tests to run]")
 }
 
-func TestMatchesNoTestsDoesNotOverrideBuildFailure(t *testing.T) {
-	tg := testgo(t)
-	defer tg.cleanup()
-	tg.parallel()
-	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
-	tg.runFail("test", "-run", "ThisWillNotMatch", "syntaxerror")
-	tg.grepBothNot(noMatchesPattern, "go test did say [no tests to run]")
-	tg.grepBoth("FAIL", "go test did not say FAIL")
-}
-
 func TestMatchesNoBenchmarksIsOK(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()

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

@@ -0,0 +1,15 @@
+# Test that when there's a build failure and a -run flag that doesn't match,
+# that the error for not matching tests does not override the error for
+# the build failure.
+
+! go test -run ThisWillNotMatch syntaxerror
+! stderr '(?m)^ok.*\[no tests to run\]'
+stdout 'FAIL'
+
+-- syntaxerror/x.go --
+package p
+-- syntaxerror/x_test.go --
+package p
+
+func f() (x.y, z int) {
+}

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

@@ -0,0 +1,14 @@
+# Test that the error message for a syntax error in a test go file
+# says FAIL.
+
+! go test syntaxerror
+stderr 'x_test.go:' # check that the error is diagnosed
+stdout 'FAIL' # check that go test says FAIL
+
+-- syntaxerror/x.go --
+package p
+-- syntaxerror/x_test.go --
+package p
+
+func f() (x.y, z int) {
+}

src/cmd/go/testdata/src/syntaxerror/x.go

@@ -1 +0,0 @@
-package p

src/cmd/go/testdata/src/syntaxerror/x_test.go

@@ -1,4 +0,0 @@
-package p
-
-func f() (x.y, z int) {
-}