Dhananjay Nakrani <******@****.***> 1495987747 -0700

Sebastián Ramírez <******@****.***> 1667505629 +0100

	...
	$

4. Convert coverage data to legacy textual format:

	$ go tool covdata textfmt -i=profiledir -o=cov.txt
	$ head cov.txt
	mode: set
	cov-example/p/p.go:12.22,13.2 0 0
	cov-example/p/p.go:15.31,16.2 1 0
	cov-example/p/p.go:16.3,18.3 0 0
	cov-example/p/p.go:19.3,21.3 0 0
	...
	$ go tool cover -html=cov.txt
	$

5. Merge profiles together:

[short] skip
cd $GOPATH/src/example.com/cov

env GO111MODULE=on
go test -coverpkg=all ./...

env GO111MODULE=off
go test -coverpkg=all ./...

-- $GOPATH/src/example.com/cov/go.mod --
module example.com/cov

-- $GOPATH/src/example.com/cov/mainonly/mainonly.go --
package main

func main() {}

-- $GOPATH/src/example.com/cov/mainwithtest/mainwithtest.go --
package main

func main() {}

[short] skip
cd $GOPATH/src/example.com/cov

env GO111MODULE=on
go test -coverpkg=all ./...

env GO111MODULE=off
go test -coverpkg=all ./...

-- $GOPATH/src/example.com/cov/go.mod --
module example.com/cov

-- $GOPATH/src/example.com/cov/notest/notest.go --
package notest

func Foo() {}

-- $GOPATH/src/example.com/cov/onlytest/onlytest_test.go --
package onlytest_test

import (

// source code to 0.
func ResetCoverage() {
	cov := coverage()
	clear(cov)
}

// SnapshotCoverage copies the current counter values into coverageSnapshot,
// preserving them for later inspection. SnapshotCoverage also rounds each
// counter down to the nearest power of two. This lets the coordinator store
// multiple values for each counter by OR'ing them together.
func SnapshotCoverage() {
	cov := coverage()
	for i, b := range cov {

	// ... off and running now.
	dbgtrace(1, "starting perform")

	indirs := strings.Split(*indirsflag, ",")
	vis := cov.CovDataVisitor(op)
	var flags cov.CovDataReaderFlags
	if *hflag {
		flags |= cov.PanicOnError
	}
	if *hwflag {
		flags |= cov.PanicOnWarning
	}
	reader := cov.MakeCovDataReader(vis, indirs, *verbflag, flags, matchpkg)
	st := 0
	if err := reader.Visit(); err != nil {

env GOCACHE=$WORK/cache

# TODO(#51484): enabled debugging info to help diagnose a deadlock in the fuzzer
env GODEBUG=fuzzdebug=1
! go test -fuzz=FuzzCov -v
! stderr 'cov instrumentation working'

-- go.mod --
module test

-- cov_test.go --
package cov

import "testing"

func FuzzCov(f *testing.F) {
	f.Fuzz(func(t *testing.T, b []byte) {
		if len(b) == 8 &&
			b[0] == 'h' &&
			b[1] == 'e' &&

		offset += i + j
	}
	return directives
}

// Makes sure that `cover -func=profile.cov` reports accurate coverage.
// Issue #20515.
func TestCoverFunc(t *testing.T) {
	testenv.MustHaveExec(t)

	// testcover -func ./testdata/profile.cov
	coverProfile := filepath.Join(testdata, "profile.cov")
	cmd := testenv.Command(t, testcover(t), "-func", coverProfile)
	out, err := cmd.Output()
	if err != nil {

! stderr 'compile(\.exe"?)? -'
! stderr 'cover(\.exe"?)? -'
[GOEXPERIMENT:coverageredesign] stderr 'covdata(\.exe"?)? percent'

# Now add in -coverprofile.
go test -cover -coverprofile=cov.dat ./pkg1 ./pkg2 ./pkg3 ./pkg4
[!GOEXPERIMENT:coverageredesign] stdout 'pkg1	\[no test files\]'
[GOEXPERIMENT:coverageredesign] stdout 'pkg1		coverage: 0.0% of statements'