bind/java, bind/objc: do not use module for reverse binding

Reverse binding is not available with Go module, and some tests
fail due to this. This CL suppresses the errors by disabling Go
modules explicitly.

Updates golang/go#27234

Change-Id: I7483c1dab468548a2efa05ca426addf5c3d97b6e
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/192599
Run-TryBot: Hajime Hoshi <hajimehoshi@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

bind/java/seq_test.go

@@ -140,7 +140,11 @@ func runTest(t *testing.T, pkgNames []string, javaPkg, javaCls string) {
 		args = append(args, "-javapkg", javaPkg)
 	}
 	args = append(args, pkgNames...)
-	buf, err := exec.Command(gomobileBin, args...).CombinedOutput()
+	cmd := exec.Command(gomobileBin, args...)
+	// Reverse binding doesn't work with Go module since imports starting with Java or ObjC are not valid FQDNs.
+	// Disable Go module explicitly until this problem is solved. See golang/go#27234.
+	cmd.Env = append(os.Environ(), "GO111MODULE=off")
+	buf, err := cmd.CombinedOutput()
 	if err != nil {
 		t.Logf("%s", buf)
 		t.Fatalf("failed to run gomobile bind: %v", err)

bind/objc/seq_test.go

@@ -129,6 +129,9 @@ func runTest(t *testing.T, pkgNames []string, prefix, testfile, framework string
 	}
 	cmd.Args = append(cmd.Args, pkgNames...)
 	cmd.Dir = filepath.Join(tmpdir, "xcodetest")
+	// Reverse binding doesn't work with Go module since imports starting with Java or ObjC are not valid FQDNs.
+	// Disable Go module explicitly until this problem is solved. See golang/go#27234.
+	cmd.Env = append(os.Environ(), "GO111MODULE=off")
 	buf, err := cmd.CombinedOutput()
 	if err != nil {
 		t.Logf("%s", buf)