diff --git a/llvm/unittests/ADT/APIntTest.cpp b/llvm/unittests/ADT/APIntTest.cpp
index 2a3abbf..b6fee5b 100644
--- a/llvm/unittests/ADT/APIntTest.cpp
+++ b/llvm/unittests/ADT/APIntTest.cpp
@@ -2845,4 +2845,21 @@
   }
 }
 
+TEST(APIntTest, SignbitZeroChecks) {
+  EXPECT_TRUE(APInt(8, -1).isNegative());
+  EXPECT_FALSE(APInt(8, -1).isNonNegative());
+  EXPECT_FALSE(APInt(8, -1).isStrictlyPositive());
+  EXPECT_TRUE(APInt(8, -1).isNonPositive());
+
+  EXPECT_FALSE(APInt(8, 0).isNegative());
+  EXPECT_TRUE(APInt(8, 0).isNonNegative());
+  EXPECT_FALSE(APInt(8, 0).isStrictlyPositive());
+  EXPECT_TRUE(APInt(8, 0).isNonPositive());
+
+  EXPECT_FALSE(APInt(8, 1).isNegative());
+  EXPECT_TRUE(APInt(8, 1).isNonNegative());
+  EXPECT_TRUE(APInt(8, 1).isStrictlyPositive());
+  EXPECT_FALSE(APInt(8, 1).isNonPositive());
+}
+
 } // end anonymous namespace