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Source file src/cmd/cover/cover_test.go

Documentation: cmd/cover

  // 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.
  
  package main_test
  
  import (
  	"bytes"
  	"fmt"
  	"internal/testenv"
  	"io/ioutil"
  	"os"
  	"os/exec"
  	"path/filepath"
  	"regexp"
  	"testing"
  )
  
  const (
  	// Data directory, also the package directory for the test.
  	testdata = "testdata"
  
  	// Binaries we compile.
  	testcover = "./testcover.exe"
  )
  
  var (
  	// Files we use.
  	testMain     = filepath.Join(testdata, "main.go")
  	testTest     = filepath.Join(testdata, "test.go")
  	coverInput   = filepath.Join(testdata, "test_line.go")
  	coverOutput  = filepath.Join(testdata, "test_cover.go")
  	coverProfile = filepath.Join(testdata, "profile.cov")
  )
  
  var debug = false // Keeps the rewritten files around if set.
  
  // Run this shell script, but do it in Go so it can be run by "go test".
  //
  //	replace the word LINE with the line number < testdata/test.go > testdata/test_line.go
  // 	go build -o ./testcover
  // 	./testcover -mode=count -var=CoverTest -o ./testdata/test_cover.go testdata/test_line.go
  //	go run ./testdata/main.go ./testdata/test.go
  //
  func TestCover(t *testing.T) {
  	testenv.MustHaveGoBuild(t)
  
  	// Read in the test file (testTest) and write it, with LINEs specified, to coverInput.
  	file, err := ioutil.ReadFile(testTest)
  	if err != nil {
  		t.Fatal(err)
  	}
  	lines := bytes.Split(file, []byte("\n"))
  	for i, line := range lines {
  		lines[i] = bytes.Replace(line, []byte("LINE"), []byte(fmt.Sprint(i+1)), -1)
  	}
  	if err := ioutil.WriteFile(coverInput, bytes.Join(lines, []byte("\n")), 0666); err != nil {
  		t.Fatal(err)
  	}
  
  	// defer removal of test_line.go
  	if !debug {
  		defer os.Remove(coverInput)
  	}
  
  	// go build -o testcover
  	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", testcover)
  	run(cmd, t)
  
  	// defer removal of testcover
  	defer os.Remove(testcover)
  
  	// ./testcover -mode=count -var=thisNameMustBeVeryLongToCauseOverflowOfCounterIncrementStatementOntoNextLineForTest -o ./testdata/test_cover.go testdata/test_line.go
  	cmd = exec.Command(testcover, "-mode=count", "-var=thisNameMustBeVeryLongToCauseOverflowOfCounterIncrementStatementOntoNextLineForTest", "-o", coverOutput, coverInput)
  	run(cmd, t)
  
  	// defer removal of ./testdata/test_cover.go
  	if !debug {
  		defer os.Remove(coverOutput)
  	}
  
  	// go run ./testdata/main.go ./testdata/test.go
  	cmd = exec.Command(testenv.GoToolPath(t), "run", testMain, coverOutput)
  	run(cmd, t)
  
  	file, err = ioutil.ReadFile(coverOutput)
  	if err != nil {
  		t.Fatal(err)
  	}
  	// compiler directive must appear right next to function declaration.
  	if got, err := regexp.MatchString(".*\n//go:nosplit\nfunc someFunction().*", string(file)); err != nil || !got {
  		t.Errorf("misplaced compiler directive: got=(%v, %v); want=(true; nil)", got, err)
  	}
  	// "go:linkname" compiler directive should be present.
  	if got, err := regexp.MatchString(`.*go\:linkname some\_name some\_name.*`, string(file)); err != nil || !got {
  		t.Errorf("'go:linkname' compiler directive not found: got=(%v, %v); want=(true; nil)", got, err)
  	}
  
  	// No other comments should be present in generated code.
  	c := ".*// This comment shouldn't appear in generated go code.*"
  	if got, err := regexp.MatchString(c, string(file)); err != nil || got {
  		t.Errorf("non compiler directive comment %q found. got=(%v, %v); want=(false; nil)", c, got, err)
  	}
  }
  
  // Makes sure that `cover -func=profile.cov` reports accurate coverage.
  // Issue #20515.
  func TestCoverFunc(t *testing.T) {
  	// go tool cover -func ./testdata/profile.cov
  	cmd := exec.Command(testenv.GoToolPath(t), "tool", "cover", "-func", coverProfile)
  	out, err := cmd.Output()
  	if err != nil {
  		if ee, ok := err.(*exec.ExitError); ok {
  			t.Logf("%s", ee.Stderr)
  		}
  		t.Fatal(err)
  	}
  
  	if got, err := regexp.Match(".*total:.*100.0.*", out); err != nil || !got {
  		t.Logf("%s", out)
  		t.Errorf("invalid coverage counts. got=(%v, %v); want=(true; nil)", got, err)
  	}
  }
  
  func run(c *exec.Cmd, t *testing.T) {
  	c.Stdout = os.Stdout
  	c.Stderr = os.Stderr
  	err := c.Run()
  	if err != nil {
  		t.Fatal(err)
  	}
  }
  

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