diff --git a/llvm/unittests/Support/BlockFrequencyTest.cpp b/llvm/unittests/Support/BlockFrequencyTest.cpp
index ac3cedf..df25642 100644
--- a/llvm/unittests/Support/BlockFrequencyTest.cpp
+++ b/llvm/unittests/Support/BlockFrequencyTest.cpp
@@ -71,6 +71,15 @@
   EXPECT_TRUE(B > C);
   EXPECT_FALSE(B <= C);
   EXPECT_TRUE(B >= C);
+
+  BranchProbability BigZero(0, UINT32_MAX);
+  BranchProbability BigOne(UINT32_MAX, UINT32_MAX);
+  EXPECT_FALSE(BigZero == BigOne);
+  EXPECT_TRUE(BigZero != BigOne);
+  EXPECT_TRUE(BigZero < BigOne);
+  EXPECT_FALSE(BigZero > BigOne);
+  EXPECT_TRUE(BigZero <= BigOne);
+  EXPECT_FALSE(BigZero >= BigOne);
 }
 
 }