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$ go get github.com/axw/gocov/gocov

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$ gocov test > test.json

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$ goconv test packagename > test.json

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{
    "Packages": [
        {
            "Name": "student",
            "Functions": [
                {
                    "Name": "Student.Id",
                    "File": "/Users/ueda/Documents/program/go/src/github.com/tenntenn/gocov-sample/student.go",
                    "Start": 83,
                    "End": 129,

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package student

import "fmt"

type Student struct {
    id int
    name string
}

func (s *Student) Id() int {

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$ gocov report test.json

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package student

import (
    "testing"
)

func TestNew(t *testing.T) {
}

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$ gocov report test.json 

student/student.go	 New		 0.00% (0/3)
student/student.go	 Student.Id	 0.00% (0/1)
student/student.go	 Student.Name	 0.00% (0/1)
student/student.go	 Student.String	 0.00% (0/1)

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package student

import (
    "testing"
)

func TestNewPanic(t *testing.T) {
    defer func() {
        if r := recover(); r == nil {
            t.Error("panicが発生しませんでした。")

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$ gocov test | gocov report
warning: building out-of-date packages:
	github.com/axw/gocov
installing these packages with 'go test -i github.com/axw/gocov/instrumented/github.com/tenntenn/gocov-sample' will speed future tests.

ok  	github.com/axw/gocov/instrumented/github.com/tenntenn/gocov-sample	0.006s

student/student.go	 New		 100.00% (3/3)
student/student.go	 Student.Id	 100.00% (1/1)
student/student.go	 Student.Name	 100.00% (1/1)