[dev.fuzz] internal/fuzz: coordinate fuzzing across workers

Package fuzz provides common fuzzing functionality for tests built
with "go test" and for programs that use fuzzing functionality in the
testing package.

Change-Id: I3901c6a993a9adb8a93733ae1838b86dd78c7036
Reviewed-on: https://go-review.googlesource.com/c/go/+/259259
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Trust: Katie Hockman <katie@golang.org>
Trust: Jay Conrod <jayconrod@google.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/testing/testing.go b/src/testing/testing.go
index 7cf3323d51..2c2e77dc4b 100644
--- a/src/testing/testing.go
+++ b/src/testing/testing.go
@@ -1324,6 +1324,8 @@ func (f matchStringOnly) ImportPath() string                          { return "
 func (f matchStringOnly) StartTestLog(io.Writer)                      {}
 func (f matchStringOnly) StopTestLog() error                          { return errMain }
 func (f matchStringOnly) SetPanicOnExit0(bool)                        {}
+func (f matchStringOnly) CoordinateFuzzing(int, [][]byte) error       { return errMain }
+func (f matchStringOnly) RunFuzzWorker(func([]byte) error) error      { return errMain }
 
 // Main is an internal function, part of the implementation of the "go test" command.
 // It was exported because it is cross-package and predates "internal" packages.
@@ -1366,6 +1368,8 @@ type testDeps interface {
 	StartTestLog(io.Writer)
 	StopTestLog() error
 	WriteProfileTo(string, io.Writer, int) error
+	CoordinateFuzzing(int, [][]byte) error
+	RunFuzzWorker(func([]byte) error) error
 }
 
 // MainStart is meant for use by tests generated by 'go test'.
@@ -1431,7 +1435,7 @@ func (m *M) Run() (code int) {
 		return
 	}
 
-	fuzzingRan, fuzzingOk := runFuzzing(m.deps.MatchString, m.fuzzTargets)
+	fuzzingRan, fuzzingOk := runFuzzing(m.deps, m.fuzzTargets)
 	if *matchFuzz != "" && !fuzzingRan {
 		fmt.Fprintln(os.Stderr, "testing: warning: no targets to fuzz")
 	}