TripleTest.FileFormat: check non-default value

Triple::objectFormat defaults to an Elf format.
Changing objectFormat to Elf doesn't make any difference.

llvm-svn: 294104
diff --git a/llvm/unittests/ADT/TripleTest.cpp b/llvm/unittests/ADT/TripleTest.cpp
index cb182d7..767d9f7 100644
--- a/llvm/unittests/ADT/TripleTest.cpp
+++ b/llvm/unittests/ADT/TripleTest.cpp
@@ -970,6 +970,9 @@
   Triple T = Triple("");
   T.setObjectFormat(Triple::ELF);
   EXPECT_EQ(Triple::ELF, T.getObjectFormat());
+
+  T.setObjectFormat(Triple::MachO);
+  EXPECT_EQ(Triple::MachO, T.getObjectFormat());
 }
 
 TEST(TripleTest, NormalizeWindows) {