--- a/zs_test.go	Fri Dec 05 18:09:03 2014 +0000
+++ b/zs_test.go	Fri Dec 05 18:21:42 2014 +0000
@@ -5,6 +5,7 @@
 	"fmt"
 	"log"
 	"os"
+	"os/exec"
 	"strings"
 	"testing"
 )
@@ -123,6 +124,24 @@
 	}
 }
 
+func TestEvalCommand(t *testing.T) {
+	s, err := eval([]string{"echo", "hello"}, map[string]string{})
+	if err != nil {
+		t.Error(err)
+	}
+	if s != "hello\n" {
+		t.Error(s)
+	}
+	_, err = eval([]string{"cat", "bogus/file"}, map[string]string{})
+	if _, ok := err.(*exec.ExitError); !ok {
+		t.Error("expected ExitError")
+	}
+	_, err = eval([]string{"missing command"}, map[string]string{})
+	if err != nil {
+		t.Error("missing command should be ignored")
+	}
+}
+
 func TestHelperProcess(*testing.T) {
 	if os.Getenv("ZS_HELPER") != "1" {
 		return