testing: switch to upstream version

GNUmakefile

@@ -363,7 +363,6 @@ TEST_PACKAGES_FAST = \
 	path \
 	reflect \
 	sync \
-	testing \
 	testing/iotest \
 	text/scanner \
 	unicode \
@@ -480,7 +479,7 @@ TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_WINDOWS)
 TEST_IOFS := false
 endif
 
-TEST_SKIP_FLAG := -skip='TestExtraMethods|TestParseAndBytesRoundTrip/P256/Generic'
+TEST_SKIP_FLAG := -skip='TestExtraMethods|TestParseAndBytesRoundTrip/P256/Generic|^Fuzz'
 
 # Test known-working standard library packages.
 # TODO: parallelize, and only show failing tests (no implied -v flag).

loader/goroot.go

@@ -256,7 +256,6 @@ func pathsToOverride(goMinor int, needsSyscallPackage bool) map[string]bool {
 		"reflect/":                    false,
 		"runtime/":                    false,
 		"sync/":                       true,
-		"testing/":                    true,
 		"tinygo/":                     false,
 		"unique/":                     false,
 	}

src/runtime/debug/garbage.go

@@ -30,7 +30,9 @@ func SetPanicOnFault(enabled bool) bool {
 
 func WriteHeapDump(fd uintptr)
 
-func SetTraceback(level string)
+// Unimplemented.
+func SetTraceback(level string) {
+}
 
 func SetMemoryLimit(limit int64) int64 {
 	return limit

src/runtime/extern.go

@@ -1,6 +1,11 @@
 package runtime
 
 func Callers(skip int, pc []uintptr) int {
+	if len(pc) > 0 {
+		// The testing package expects at least one caller in all cases.
+		pc[0] = 0
+		return 1
+	}
 	return 0
 }
 

src/runtime/runtime.go

@@ -181,3 +181,19 @@ func getAuxv() []uintptr {
 func cgo_errno() uintptr {
 	return uintptr(*libc_errno_location())
 }
+
+// Unimplemented.
+var MemProfileRate int = 0
+
+// Unimplemented.
+func SetBlockProfileRate(rate int) {
+}
+
+var mutexProfileFraction int
+
+// Unimplemented.
+func SetMutexProfileFraction(rate int) int {
+	previous := mutexProfileFraction
+	mutexProfileFraction = rate
+	return previous
+}