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// Copyright 2014 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.
// No testdata on Android.
//go:build !android && go1.11
// +build !android,go1.11
package main
import (
"bytes"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"testing"
"golang.org/x/tools/internal/testenv"
)
func init() {
// This test currently requires GOPATH mode.
// Explicitly disabling module mode should suffix, but
// we'll also turn off GOPROXY just for good measure.
if err := os.Setenv("GO111MODULE", "off"); err != nil {
log.Fatal(err)
}
if err := os.Setenv("GOPROXY", "off"); err != nil {
log.Fatal(err)
}
}
func TestCallgraph(t *testing.T) {
if b := os.Getenv("GO_BUILDER_NAME"); b == "windows-arm64-10" {
t.Skipf("skipping due to suspected file corruption bug on %s builder (https://go.dev/issue/50706)", b)
}
testenv.NeedsTool(t, "go")
gopath, err := filepath.Abs("testdata")
if err != nil {
t.Fatal(err)
}
for _, test := range []struct {
algo string
tests bool
want []string
}{
{"rta", false, []string{
// rta imprecisely shows cross product of {main,main2} x {C,D}
`pkg.main --> (pkg.C).f`,
`pkg.main --> (pkg.D).f`,
`pkg.main --> pkg.main2`,
`pkg.main2 --> (pkg.C).f`,
`pkg.main2 --> (pkg.D).f`,
}},
{"pta", false, []string{
// pta distinguishes main->C, main2->D. Also has a root node.
`<root> --> pkg.init`,
`<root> --> pkg.main`,
`pkg.main --> (pkg.C).f`,
`pkg.main --> pkg.main2`,
`pkg.main2 --> (pkg.D).f`,
}},
// tests: both the package's main and the test's main are called.
// The callgraph includes all the guts of the "testing" package.
{"rta", true, []string{
`pkg.test.main --> testing.MainStart`,
`testing.runExample --> pkg.Example`,
`pkg.Example --> (pkg.C).f`,
`pkg.main --> (pkg.C).f`,
}},
{"pta", true, []string{
`<root> --> pkg.test.main`,
`<root> --> pkg.main`,
`pkg.test.main --> testing.MainStart`,
`testing.runExample --> pkg.Example`,
`pkg.Example --> (pkg.C).f`,
`pkg.main --> (pkg.C).f`,
}},
} {
const format = "{{.Caller}} --> {{.Callee}}"
stdout = new(bytes.Buffer)
if err := doCallgraph("testdata/src", gopath, test.algo, format, test.tests, []string{"pkg"}); err != nil {
t.Error(err)
continue
}
edges := make(map[string]bool)
for _, line := range strings.Split(fmt.Sprint(stdout), "\n") {
edges[line] = true
}
for _, edge := range test.want {
if !edges[edge] {
t.Errorf("callgraph(%q, %t): missing edge: %s",
test.algo, test.tests, edge)
}
}
if t.Failed() {
t.Log("got:\n", stdout)
}
}
}
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