provided code

src/tests/userprog/close-twice.ck

@@ -0,0 +1,19 @@
+# -*- perl -*-
+use strict;
+use warnings;
+use tests::tests;
+check_expected ([<<'EOF', <<'EOF']);
+(close-twice) begin
+(close-twice) open "sample.txt"
+(close-twice) close "sample.txt"
+(close-twice) close "sample.txt" again
+(close-twice) end
+close-twice: exit(0)
+EOF
+(close-twice) begin
+(close-twice) open "sample.txt"
+(close-twice) close "sample.txt"
+(close-twice) close "sample.txt" again
+close-twice: exit(-1)
+EOF
+pass;