/
mktest.go
142 lines (118 loc) · 2.5 KB
/
mktest.go
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package main
import (
"bytes"
"go/ast"
"go/parser"
"go/printer"
"go/token"
"log"
"os"
"strings"
"text/template"
"code.google.com/p/go.tools/imports"
)
type Param struct {
Name string
Type string
}
type Test struct {
Name string
Params []Param
}
type TestFile struct {
Pkg string
Tests []Test
}
func fmtexpr(fset *token.FileSet, e ast.Expr) string {
var buf bytes.Buffer
printer.Fprint(&buf, fset, e)
return buf.String()
}
func paramname(field *ast.Field) string {
if len(field.Names) > 0 {
return field.Names[0].Name
}
return "_"
}
func param(fset *token.FileSet, field *ast.Field) Param {
return Param{
Name: paramname(field),
Type: fmtexpr(fset, field.Type),
}
}
func Parse(path string) (*TestFile, error) {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, path, nil, 0)
if err != nil {
return nil, err
}
tf := TestFile{Pkg: f.Name.Name}
for _, decl := range f.Decls {
fun, ok := decl.(*ast.FuncDecl)
if !ok || !ast.IsExported(fun.Name.Name) {
continue
}
test := Test{Name: fun.Name.Name}
// Receiver (for methods)
if fun.Recv != nil {
test.Params = append(test.Params, param(fset, fun.Recv.List[0]))
}
// Parameters
for _, field := range fun.Type.Params.List {
test.Params = append(test.Params, param(fset, field))
}
// Return values
for _, field := range fun.Type.Results.List {
test.Params = append(test.Params, param(fset, field))
}
tf.Tests = append(tf.Tests, test)
}
return &tf, nil
}
const skeleton = `
package {{.Pkg}}
import "testing"
{{range .Tests}}
func Test{{.Name}}(t *testing.T) { {{if .Params}}
cases := []struct{
{{range .Params}}{{.Name}} {{.Type}}
{{end}}
}{
{
{{range .Params}}// {{.Name}}: ,
{{end}} },
}
{{end}}
{{if .Params}}
for _, tt := range cases {
_ = tt
}{{end}}
}
{{end}}
`
var tmpl = template.Must(template.New("test").Parse(skeleton))
func main() {
file := os.Args[1]
if !strings.HasSuffix(file, ".go") || strings.HasSuffix(file, "_test.go") {
log.Fatal("arg must be go file, not test")
}
in, err := Parse(file)
if err != nil {
log.Fatal(err)
}
var buf bytes.Buffer
tmpl.Execute(&buf, in)
src, err := imports.Process("", buf.Bytes(), nil)
if err != nil {
log.Fatalf("%s\nfailed to gofmt generated code: %v", src, err)
}
file = strings.TrimSuffix(file, ".go") + "_test.go"
out, err := os.OpenFile(file, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0644)
if err != nil {
log.Fatal(err)
}
defer out.Close()
if _, err := out.Write(src); err != nil {
log.Fatal(err)
}
}