tests: Add test that GopherJS can be vendored.

Rely on runtime.GOARCH and t.Skip to skip tests that shouldn't be run with GopherJS. It's more clear and reliable than a file-wide build tag. Include stderr from gopherjsvendored_test.sh in output of TestGopherJSCanBeVendored. This is only to get get more information when it fails.
gopherjs · dmitshur · Apr 21, 2018 · Apr 7, 2018 · Apr 7, 2018 · Apr 7, 2018
commit d0d69c08b6af458cebb60d3295f643e4a471029d
diff --git a/tests/gopherjsvendored_test.sh b/tests/gopherjsvendored_test.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+# Don't run this file directly. It's executed as part of TestGopherJSCanBeVendored.
+
+set -e
+
+tmp=$(mktemp -d "${TMPDIR:-/tmp}/gopherjsvendored_test.XXXXXXXXXX")
+
+cleanup() {
+    rm -rf "$tmp"
+    exit
+}
+
+trap cleanup EXIT HUP INT TERM
+
+# copyGoPackage copies Go package with import path $1 to directory $2.
+# The target directory is created if it doesn't exist.
+copyGoPackage() {
+    mkdir -p "$2"
+    pkgDir=$(go list -f '{{.Dir}}' "$1")
+    # Copy all files (not directories), other than ones that start with "." or "_".
+    for f in $(find -H "$pkgDir" -maxdepth 1 -name "[^._]*" -type f); do
+        cp "$f" "$2"
+    done
+}
+
+# Make a hello project that will vendor GopherJS.
+mkdir -p "$tmp/src/example.org/hello"
+echo 'package main
+
+import "github.com/gopherjs/gopherjs/js"
+
+func main() {
+    js.Global.Get("console").Call("log", "hello using js pkg")
+}' > "$tmp/src/example.org/hello/main.go"
+
+# Vendor GopherJS and its dependencies into hello project.
+for pkg in $(go list -f '{{if not .Goroot}}{{.ImportPath}}{{end}}' $(go list -f '{{.ImportPath}} {{join .Deps " "}}' github.com/gopherjs/gopherjs)); do
+    copyGoPackage "$pkg" "$tmp/src/example.org/hello/vendor/$pkg"
+done
+
+# Make $tmp our GOPATH workspace.
+export GOPATH="$tmp"
+
+# Build the vendored copy of GopherJS.
+go install example.org/hello/vendor/github.com/gopherjs/gopherjs
+
+# Use it to build and run the hello command.
+(cd "$GOPATH/src/example.org/hello" && "$GOPATH/bin/gopherjs" run main.go)
diff --git a/tests/gorepo_test.go b/tests/gorepo_test.go
@@ -1,15 +1,18 @@
-// +build !js
-
 package tests_test
 
 import (
 	"os"
 	"os/exec"
+	"runtime"
 	"testing"
 )
 
 // Go repository basic compiler tests, and regression tests for fixed compiler bugs.
 func TestGoRepositoryCompilerTests(t *testing.T) {
+	if runtime.GOARCH == "js" {
+		t.Skip("test meant to be run using normal Go compiler (needs os/exec)")
+	}
+
 	args := []string{"go", "run", "run.go", "-summary"}
 	if testing.Verbose() {
 		args = append(args, "-v")
@@ -22,3 +25,21 @@ func TestGoRepositoryCompilerTests(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// Test that GopherJS can be vendored into a project, and then used to build Go programs.
+// See issue https://github.com/gopherjs/gopherjs/issues/415.
+func TestGopherJSCanBeVendored(t *testing.T) {
+	if runtime.GOARCH == "js" {
+		t.Skip("test meant to be run using normal Go compiler (needs os/exec)")
+	}
+
+	cmd := exec.Command("sh", "gopherjsvendored_test.sh")
+	cmd.Stderr = os.Stdout
+	got, err := cmd.Output()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if want := "hello using js pkg\n"; string(got) != want {
+		t.Errorf("unexpected stdout from gopherjsvendored_test.sh:\ngot:\n%s\nwant:\n%s", got, want)
+	}
+}
diff --git a/tests/lowlevel_test.go b/tests/lowlevel_test.go
@@ -1,12 +1,11 @@
-// +build !js
-
 package tests_test
 
 import (
 	"bytes"
 	"io/ioutil"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"testing"
 )
 
@@ -15,6 +14,10 @@ import (
 //
 // See https://github.com/gopherjs/gopherjs/issues/279.
 func TestTimeInternalizationExternalization(t *testing.T) {
+	if runtime.GOARCH == "js" {
+		t.Skip("test meant to be run using normal Go compiler (needs os/exec)")
+	}
+
 	got, err := exec.Command("gopherjs", "run", filepath.Join("testdata", "time_inexternalization.go")).Output()
 	if err != nil {
 		t.Fatalf("%v:\n%s", err, got)