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// Bare bones Go testing support for Bazel.
package main
import (
"flag"
"go/ast"
"go/parser"
"go/token"
"log"
"os"
"strings"
"text/template"
)
// Cases holds template data.
type Cases struct {
Package string
Names []string
}
func main() {
pkg := flag.String("package", "", "package from which to import test methods.")
out := flag.String("output", "", "output file to write. Defaults to stdout.")
flag.Parse()
if *pkg == "" {
log.Fatal("must set --package.")
}
outFile := os.Stdout
if *out != "" {
var err error
outFile, err = os.Create(*out)
if err != nil {
log.Fatalf("os.Create(%q): %v", *out, err)
}
defer outFile.Close()
}
cases := Cases{
Package: *pkg,
}
testFileSet := token.NewFileSet()
for _, f := range flag.Args() {
parse, err := parser.ParseFile(testFileSet, f, nil, parser.ParseComments)
if err != nil {
log.Fatalf("ParseFile(%q): %v", f, err)
}
for _, d := range parse.Decls {
fn, ok := d.(*ast.FuncDecl)
if !ok {
continue
}
if fn.Recv != nil {
continue
}
if !strings.HasPrefix(fn.Name.Name, "Test") {
continue
}
cases.Names = append(cases.Names, fn.Name.Name)
}
}
tpl := template.Must(template.New("source").Parse(`
package main
import (
"testing"
undertest "{{.Package}}"
)
func everything(pat, str string) (bool, error) {
return true, nil
}
var tests = []testing.InternalTest{
{{range .Names}}
{"{{.}}", undertest.{{.}} },
{{end}}
}
func main() {
testing.Main(everything, tests, nil, nil)
}
`))
if err := tpl.Execute(outFile, &cases); err != nil {
log.Fatalf("template.Execute(%v): %v", cases, err)
}
}
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