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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Support for test coverage.
package testing
import (
"fmt"
"os"
"sync/atomic"
)
// CoverBlock records the coverage data for a single basic block.
// NOTE: This struct is internal to the testing infrastructure and may change.
// It is not covered (yet) by the Go 1 compatibility guidelines.
type CoverBlock struct {
Line0 uint32
Col0 uint16
Line1 uint32
Col1 uint16
Stmts uint16
}
var cover Cover
// Cover records information about test coverage checking.
// NOTE: This struct is internal to the testing infrastructure and may change.
// It is not covered (yet) by the Go 1 compatibility guidelines.
type Cover struct {
Mode string
Counters map[string][]uint32
Blocks map[string][]CoverBlock
CoveredPackages string
}
// Coverage reports the current code coverage as a fraction in the range [0, 1].
// If coverage is not enabled, Coverage returns 0.
//
// When running a large set of sequential test cases, checking Coverage after each one
// can be useful for identifying which test cases exercise new code paths.
// It is not a replacement for the reports generated by 'go test -cover' and
// 'go tool cover'.
func Coverage() float64 {
var n, d int64
for _, counters := range cover.Counters {
for i := range counters {
if atomic.LoadUint32(&counters[i]) > 0 {
n++
}
d++
}
}
if d == 0 {
return 0
}
return float64(n) / float64(d)
}
// RegisterCover records the coverage data accumulators for the tests.
// NOTE: This function is internal to the testing infrastructure and may change.
// It is not covered (yet) by the Go 1 compatibility guidelines.
func RegisterCover(c Cover) {
cover = c
}
// mustBeNil checks the error and, if present, reports it and exits.
func mustBeNil(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "testing: %s\n", err)
os.Exit(2)
}
}
// coverReport reports the coverage percentage and writes a coverage profile if requested.
func coverReport() {
var f *os.File
var err error
if *coverProfile != "" {
f, err = os.Create(toOutputDir(*coverProfile))
mustBeNil(err)
fmt.Fprintf(f, "mode: %s\n", cover.Mode)
defer func() { mustBeNil(f.Close()) }()
}
var active, total int64
var count uint32
for name, counts := range cover.Counters {
blocks := cover.Blocks[name]
for i := range counts {
stmts := int64(blocks[i].Stmts)
total += stmts
count = atomic.LoadUint32(&counts[i]) // For -mode=atomic.
if count > 0 {
active += stmts
}
if f != nil {
_, err := fmt.Fprintf(f, "%s:%d.%d,%d.%d %d %d\n", name,
blocks[i].Line0, blocks[i].Col0,
blocks[i].Line1, blocks[i].Col1,
stmts,
count)
mustBeNil(err)
}
}
}
if total == 0 {
total = 1
}
fmt.Printf("coverage: %.1f%% of statements%s\n", 100*float64(active)/float64(total), cover.CoveredPackages)
}
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