1 files changed, 51 insertions, 1 deletions
diff --git a/absl/strings/str_cat_test.cc b/absl/strings/str_cat_test.cc
index 69df2502..2d74245e 100644
--- a/absl/strings/str_cat_test.cc
+++ b/absl/strings/str_cat_test.cc
@@ -21,6 +21,7 @@
 #include <vector>
 
 #include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
 #include "absl/strings/substitute.h"
 
 #ifdef __ANDROID__
@@ -442,7 +443,7 @@ TEST(StrCat, AvoidsMemcpyWithNullptr) {
   EXPECT_EQ(result, "12345");
 }
 
-#ifdef GTEST_HAS_DEATH_TEST
+#if GTEST_HAS_DEATH_TEST
 TEST(StrAppend, Death) {
   std::string s = "self";
   // on linux it's "assertion", on mac it's "Assertion",
@@ -612,4 +613,53 @@ TEST(Numbers, TestFunctionsMovedOverFromNumbersMain) {
   TestFastPrints();
 }
 
+struct PointStringify {
+  template <typename FormatSink>
+  friend void AbslStringify(FormatSink& sink, const PointStringify& p) {
+    sink.Append("(");
+    sink.Append(absl::StrCat(p.x));
+    sink.Append(", ");
+    sink.Append(absl::StrCat(p.y));
+    sink.Append(")");
+  }
+
+  double x = 10.0;
+  double y = 20.0;
+};
+
+TEST(StrCat, AbslStringifyExample) {
+  PointStringify p;
+  EXPECT_EQ(absl::StrCat(p), "(10, 20)");
+  EXPECT_EQ(absl::StrCat("a ", p, " z"), "a (10, 20) z");
+}
+
+struct PointStringifyUsingFormat {
+  template <typename FormatSink>
+  friend void AbslStringify(FormatSink& sink,
+                            const PointStringifyUsingFormat& p) {
+    absl::Format(&sink, "(%g, %g)", p.x, p.y);
+  }
+
+  double x = 10.0;
+  double y = 20.0;
+};
+
+TEST(StrCat, AbslStringifyExampleUsingFormat) {
+  PointStringifyUsingFormat p;
+  EXPECT_EQ(absl::StrCat(p), "(10, 20)");
+  EXPECT_EQ(absl::StrCat("a ", p, " z"), "a (10, 20) z");
+}
+
+enum class EnumWithStringify { Many = 0, Choices = 1 };
+
+template <typename Sink>
+void AbslStringify(Sink& sink, EnumWithStringify e) {
+  absl::Format(&sink, "%s", e == EnumWithStringify::Many ? "Many" : "Choices");
+}
+
+TEST(StrCat, AbslStringifyWithEnum) {
+  const auto e = EnumWithStringify::Choices;
+  EXPECT_EQ(absl::StrCat(e), "Choices");
+}
+
 }  // namespace