Add a unit test

Author: kuilpd

llvm/unittests/ADT/StringRefTest.cpp

@@ -619,6 +619,29 @@ TEST(StringRefTest, Hashing) {
             hash_value(StringRef("hello world").slice(1, -1)));
 }
 
+struct RadixPair {
+  const char *Str;
+  unsigned Expected;
+} RadixNumbers[] =
+  { {"123", 10}
+  , {"1", 10}
+  , {"0b1", 2}
+  , {"01", 8}
+  , {"0o1", 8}
+  , {"0x1", 16}
+  , {"0", 10}
+  , {"00", 8}
+  , {"", 10}
+  };
+
+TEST(StringRefTest, getAutoSenseRadix) {
+  for (size_t i = 0; i < std::size(RadixNumbers); ++i) {
+    StringRef number = RadixNumbers[i].Str;
+    unsigned radix = getAutoSenseRadix(number);
+    EXPECT_EQ(radix, RadixNumbers[i].Expected);
+  }
+}
+
 struct UnsignedPair {
   const char *Str;
   uint64_t Expected;