diff --git a/llvm/test/Assembler/dev-full.ll b/llvm/test/Assembler/dev-full.ll
new file mode 100644
index 000000000000..6f600f95fbcf
--- /dev/null
+++ b/llvm/test/Assembler/dev-full.ll
@@ -0,0 +1,3 @@
+; RUN: not llvm-as < %s > /dev/full 2>/dev/null
+
+; raw_ostream should detect write errors.