add TestVersioned

Follow-up to LK4D4#87

Signed-off-by: Akihiro Suda <[email protected]>

test/vndr_test.go

@@ -467,3 +467,59 @@ func main(){})
 		t.Errorf("expected to clean some ignore files, list of files are kept %s", kept)
 	}
 }
+
+func TestVersioned(t *testing.T) {
+	vndrBin, err := exec.LookPath("vndr")
+	if err != nil {
+		t.Fatal(err)
+	}
+	tmp, err := ioutil.TempDir("", "test-vndr-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmp)
+	repoDir := filepath.Join(tmp, "src", testRepo)
+	if err := os.MkdirAll(repoDir, 0700); err != nil {
+		t.Fatal(err)
+	}
+	content := []byte(`github.com/coreos/go-systemd/v22 v22.0.0
+github.com/godbus/dbus/v5 v5.0.3
+`)
+	if err := ioutil.WriteFile(filepath.Join(repoDir, "main.go"),
+		[]byte(`package foo
+
+import (
+        "github.com/coreos/go-systemd/v22/dbus"
+)
+
+func Foo() (*dbus.Conn, error) {
+        return dbus.New()
+}
+`), 0644); err != nil {
+		t.Fatal(err)
+	}
+	vendorConf := filepath.Join(repoDir, "vendor.conf")
+	if err := ioutil.WriteFile(vendorConf, content, 0666); err != nil {
+		t.Fatal(err)
+	}
+	vndrCmd := exec.Command(vndrBin, "-verbose")
+	vndrCmd.Dir = repoDir
+	setGopath(vndrCmd, tmp)
+
+	out, err := vndrCmd.CombinedOutput()
+	t.Logf("Output of vndr:\n%s", out)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// https://github.com/coreos/go-systemd/blob/v22.0.0/go.mod appears in this path
+	systemdV22GoModPath := filepath.Join(repoDir, "vendor/github.com/coreos/go-systemd/v22/go.mod")
+	systemdV22GoMod, err := ioutil.ReadFile(systemdV22GoModPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("content of %s:\n%s", systemdV22GoModPath, string(systemdV22GoMod))
+	systemdV22GoModHeader := "module github.com/coreos/go-systemd/v22"
+	if !strings.Contains(string(systemdV22GoMod), systemdV22GoModHeader) {
+		t.Fatalf("expected %s to contain %q", systemdV22GoModPath, systemdV22GoModHeader)
+	}
+}