87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Support for test coverage.
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package testing
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import (
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"fmt"
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"os"
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)
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// CoverBlock records the coverage data for a single basic block.
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// NOTE: This struct is internal to the testing infrastructure and may change.
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// It is not covered (yet) by the Go 1 compatibility guidelines.
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type CoverBlock struct {
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Line0 uint32
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Col0 uint16
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Line1 uint32
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Col1 uint16
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Stmts uint16
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}
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var cover Cover
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// Cover records information about test coverage checking.
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// NOTE: This struct is internal to the testing infrastructure and may change.
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// It is not covered (yet) by the Go 1 compatibility guidelines.
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type Cover struct {
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Mode string
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Counters map[string][]uint32
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Blocks map[string][]CoverBlock
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CoveredPackages string
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}
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// RegisterCover records the coverage data accumulators for the tests.
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// NOTE: This function is internal to the testing infrastructure and may change.
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// It is not covered (yet) by the Go 1 compatibility guidelines.
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func RegisterCover(c Cover) {
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cover = c
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}
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// mustBeNil checks the error and, if present, reports it and exits.
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func mustBeNil(err error) {
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if err != nil {
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fmt.Fprintf(os.Stderr, "testing: %s\n", err)
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os.Exit(2)
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}
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}
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// coverReport reports the coverage percentage and writes a coverage profile if requested.
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func coverReport() {
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var f *os.File
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var err error
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if *coverProfile != "" {
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f, err = os.Create(toOutputDir(*coverProfile))
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mustBeNil(err)
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fmt.Fprintf(f, "mode: %s\n", cover.Mode)
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defer func() { mustBeNil(f.Close()) }()
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}
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var active, total int64
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for name, counts := range cover.Counters {
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blocks := cover.Blocks[name]
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for i, count := range counts {
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stmts := int64(blocks[i].Stmts)
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total += stmts
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if count > 0 {
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active += stmts
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}
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if f != nil {
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_, err := fmt.Fprintf(f, "%s:%d.%d,%d.%d %d %d\n", name,
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blocks[i].Line0, blocks[i].Col0,
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blocks[i].Line1, blocks[i].Col1,
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stmts,
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count)
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mustBeNil(err)
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}
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}
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}
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if total == 0 {
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total = 1
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}
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fmt.Printf("coverage: %.1f%% of statements%s\n", 100*float64(active)/float64(total), cover.CoveredPackages)
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}
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