diff --git a/llvm/unittests/ADT/TripleTest.cpp b/llvm/unittests/ADT/TripleTest.cpp
index b0f13d8..5b00a01 100644
--- a/llvm/unittests/ADT/TripleTest.cpp
+++ b/llvm/unittests/ADT/TripleTest.cpp
@@ -1237,6 +1237,17 @@
   EXPECT_EQ((unsigned)3, Minor);
   EXPECT_EQ((unsigned)0, Micro);
   EXPECT_TRUE(T.isSimulatorEnvironment());
+  EXPECT_FALSE(T.isMacCatalystEnvironment());
+
+  T = Triple("x86_64-apple-ios13.0-maccatalyst");
+  EXPECT_TRUE(T.isiOS());
+  T.getiOSVersion(Major, Minor, Micro);
+  EXPECT_EQ((unsigned)13, Major);
+  EXPECT_EQ((unsigned)0, Minor);
+  EXPECT_EQ((unsigned)0, Micro);
+  EXPECT_TRUE(T.getEnvironment() == Triple::MacCatalyst);
+  EXPECT_TRUE(T.isMacCatalystEnvironment());
+  EXPECT_FALSE(T.isSimulatorEnvironment());
 }
 
 TEST(TripleTest, FileFormat) {