[AArch64][TargetParser] Add formatting test for --print-enabled-extensios

Author: pratlucas

llvm/unittests/TargetParser/TargetParserTest.cpp

@@ -2373,6 +2373,23 @@ TEST(TargetParserTest, AArch64PrintSupportedExtensions) {
   EXPECT_EQ(std::string::npos, captured.find("ssbs2"));
 }
 
+TEST(TargetParserTest, AArch64PrintEnabledExtensions) {
+  // Pick a single enabled extension to validate formatting
+  std::vector<StringRef> EnabledExtensions = {"crc"};
+  std::string ExpectedOutput =
+      "Extensions enabled for the given AArch64 target\n\n"
+      "    Architecture Feature(s)                                Description\n"
+      "    FEAT_CRC32                                             Enable ARMv8 CRC-32 checksum instructions\n";
+
+  outs().flush();
+  testing::internal::CaptureStdout();
+  AArch64::printEnabledExtensions(EnabledExtensions);
+  outs().flush();
+  std::string CapturedOutput = testing::internal::GetCapturedStdout();
+
+  EXPECT_EQ(CapturedOutput, ExpectedOutput);
+}
+
 struct AArch64ExtensionDependenciesBaseArchTestParams {
   const llvm::AArch64::ArchInfo &Arch;
   std::vector<StringRef> Modifiers;