1 files changed, 69 insertions, 0 deletions
diff --git a/misc/cgo/test/pkg_test.go b/misc/cgo/test/pkg_test.go
new file mode 100644
index 0000000..94abaa0
--- /dev/null
+++ b/misc/cgo/test/pkg_test.go
@@ -0,0 +1,69 @@
+// Copyright 2019 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.
+
+package cgotest
+
+import (
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+// TestCrossPackageTests compiles and runs tests that depend on imports of other
+// local packages, using source code stored in the testdata directory.
+//
+// The tests in the misc directory tree do not have a valid import path in
+// GOPATH mode, so they previously used relative imports. However, relative
+// imports do not work in module mode. In order to make the test work in both
+// modes, we synthesize a GOPATH in which the module paths are equivalent, and
+// run the tests as a subprocess.
+//
+// If and when we no longer support these tests in GOPATH mode, we can remove
+// this shim and move the tests currently located in testdata back into the
+// parent directory.
+func TestCrossPackageTests(t *testing.T) {
+	switch runtime.GOOS {
+	case "android":
+		t.Skip("Can't exec cmd/go subprocess on Android.")
+	case "ios":
+		switch runtime.GOARCH {
+		case "arm64":
+			t.Skip("Can't exec cmd/go subprocess on iOS.")
+		}
+	}
+
+	GOPATH, err := ioutil.TempDir("", "cgotest")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(GOPATH)
+
+	modRoot := filepath.Join(GOPATH, "src", "cgotest")
+	if err := overlayDir(modRoot, "testdata"); err != nil {
+		t.Fatal(err)
+	}
+	if err := ioutil.WriteFile(filepath.Join(modRoot, "go.mod"), []byte("module cgotest\n"), 0666); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd := exec.Command("go", "test")
+	if testing.Verbose() {
+		cmd.Args = append(cmd.Args, "-v")
+	}
+	if testing.Short() {
+		cmd.Args = append(cmd.Args, "-short")
+	}
+	cmd.Dir = modRoot
+	cmd.Env = append(os.Environ(), "GOPATH="+GOPATH, "PWD="+cmd.Dir)
+	out, err := cmd.CombinedOutput()
+	if err == nil {
+		t.Logf("%s:\n%s", strings.Join(cmd.Args, " "), out)
+	} else {
+		t.Fatalf("%s: %s\n%s", strings.Join(cmd.Args, " "), err, out)
+	}
+}