[StringRef] Test all default characters in unit test

JDevlieghere · JDevlieghere · commit db76588964ee · 2019-12-11T10:46:07.000-08:00
The default characters for trim, ltrim and rtrim are " \t\n\v\f\r" but
only spaces were tested. Test that the others are trimmed as well.
diff --git a/llvm/unittests/ADT/StringRefTest.cpp b/llvm/unittests/ADT/StringRefTest.cpp
@@ -324,16 +324,20 @@ TEST(StringRefTest, Trim) {
   StringRef Str0("hello");
   StringRef Str1(" hello ");
   StringRef Str2("  hello  ");
+  StringRef Str3("\t\n\v\f\r  hello  \t\n\v\f\r");
 
   EXPECT_EQ(StringRef("hello"), Str0.rtrim());
   EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
   EXPECT_EQ(StringRef("  hello"), Str2.rtrim());
+  EXPECT_EQ(StringRef("\t\n\v\f\r  hello"), Str3.rtrim());
   EXPECT_EQ(StringRef("hello"), Str0.ltrim());
   EXPECT_EQ(StringRef("hello "), Str1.ltrim());
   EXPECT_EQ(StringRef("hello  "), Str2.ltrim());
+  EXPECT_EQ(StringRef("hello  \t\n\v\f\r"), Str3.ltrim());
   EXPECT_EQ(StringRef("hello"), Str0.trim());
   EXPECT_EQ(StringRef("hello"), Str1.trim());
   EXPECT_EQ(StringRef("hello"), Str2.trim());
+  EXPECT_EQ(StringRef("hello"), Str3.trim());
 
   EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
 
