1 files changed, 11 insertions, 0 deletions
diff --git a/src/pkg/os/env_test.go b/src/pkg/os/env_test.go
index 04ff39072..991fa4d05 100644
--- a/src/pkg/os/env_test.go
+++ b/src/pkg/os/env_test.go
@@ -6,6 +6,7 @@ package os_test
 
 import (
 	. "os"
+	"reflect"
 	"testing"
 )
 
@@ -57,3 +58,13 @@ func TestExpand(t *testing.T) {
 		}
 	}
 }
+
+func TestConsistentEnviron(t *testing.T) {
+	e0 := Environ()
+	for i := 0; i < 10; i++ {
+		e1 := Environ()
+		if !reflect.DeepEqual(e0, e1) {
+			t.Fatalf("environment changed")
+		}
+	}
+}