diff --git a/llvm/test/MC/ARM/basic-thumb-instructions.s b/llvm/test/MC/ARM/basic-thumb-instructions.s
index efd8c5eca7ca..f65c7cc35e4c 100644
--- a/llvm/test/MC/ARM/basic-thumb-instructions.s
+++ b/llvm/test/MC/ARM/basic-thumb-instructions.s
@@ -553,3 +553,11 @@ _func:
 
 @ CHECK: sxtb	r3, r5                  @ encoding: [0x6b,0xb2]
 @ CHECK: sxth	r3, r5                  @ encoding: [0x2b,0xb2]
+
+
+@------------------------------------------------------------------------------
+@ TST
+@------------------------------------------------------------------------------
+        tst r6, r1
+
+@ CHECK: tst	r6, r1                  @ encoding: [0x0e,0x42]