reflect: test, fix access to nil maps
Fixes #8010.
LGTM=bradfitz, khr
R=khr, bradfitz, dvyukov
CC=golang-codereviews
https://golang.org/cl/91450048
diff --git a/src/pkg/reflect/all_test.go b/src/pkg/reflect/all_test.go
index 1e6341b..9c5eb4e 100644
--- a/src/pkg/reflect/all_test.go
+++ b/src/pkg/reflect/all_test.go
@@ -973,6 +973,28 @@
}
}
+func TestNilMap(t *testing.T) {
+ var m map[string]int
+ mv := ValueOf(m)
+ keys := mv.MapKeys()
+ if len(keys) != 0 {
+ t.Errorf(">0 keys for nil map: %v", keys)
+ }
+
+ // Check that value for missing key is zero.
+ x := mv.MapIndex(ValueOf("hello"))
+ if x.Kind() != Invalid {
+ t.Errorf("m.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x)
+ }
+
+ // Check big value too.
+ var mbig map[string][10 << 20]byte
+ x = ValueOf(mbig).MapIndex(ValueOf("hello"))
+ if x.Kind() != Invalid {
+ t.Errorf("mbig.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x)
+ }
+}
+
func TestChan(t *testing.T) {
for loop := 0; loop < 2; loop++ {
var c chan int
