Fix eval tests.

eval/compile.go

@@ -33,6 +33,10 @@ var (
 	ErrStillRunning = errors.New("still running")
 )
 
+// Whether elvish should attempt to put itself in foreground after each pipeline
+// execution.
+var PutInForeground = true
+
 type scope map[string]bool
 
 type (
@@ -160,9 +164,11 @@ func (cp *compiler) pipeline(n *parse.Pipeline) Op {
 		signal.Stop(intCh)
 
 		// Make sure I am in foreground.
-		err := sys.Tcsetpgrp(0, syscall.Getpgrp())
-		if err != nil {
-			throw(err)
+		if PutInForeground {
+			err := sys.Tcsetpgrp(0, syscall.Getpgrp())
+			if err != nil {
+				throw(err)
+			}
 		}
 
 		if !allok(errors) {

eval/eval_test.go

@@ -222,6 +222,10 @@ func evalAndCollect(t *testing.T, texts []string, chsize int) ([]Value, []byte,
 	return outs, outBytes, ex
 }
 
+func init() {
+	PutInForeground = false
+}
+
 func TestEval(t *testing.T) {
 	for _, tt := range evalTests {
 		// fmt.Printf("eval %q\n", tt.text)