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diff --git a/src/template_test.cc b/src/template_test.cc
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2016 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "template_test.h"
+
+#include <cstring>
+#include <iostream>
+#include <sstream>
+
+#include <CUnit/CUnit.h>
+
+#include "template.h"
+
+namespace nghttp2 {
+
+void test_template_immutable_string(void) {
+  ImmutableString null;
+
+  CU_ASSERT("" == null);
+  CU_ASSERT(0 == null.size());
+  CU_ASSERT(null.empty());
+
+  ImmutableString from_cstr("alpha");
+
+  CU_ASSERT(0 == strcmp("alpha", from_cstr.c_str()));
+  CU_ASSERT(5 == from_cstr.size());
+  CU_ASSERT(!from_cstr.empty());
+  CU_ASSERT("alpha" == from_cstr);
+  CU_ASSERT(from_cstr == "alpha");
+  CU_ASSERT(std::string("alpha") == from_cstr);
+  CU_ASSERT(from_cstr == std::string("alpha"));
+
+  // copy constructor
+  ImmutableString src("charlie");
+  ImmutableString copy = src;
+
+  CU_ASSERT("charlie" == copy);
+  CU_ASSERT(7 == copy.size());
+
+  // copy assignment
+  ImmutableString copy2;
+  copy2 = src;
+
+  CU_ASSERT("charlie" == copy2);
+  CU_ASSERT(7 == copy2.size());
+
+  // move constructor
+  ImmutableString move = std::move(copy);
+
+  CU_ASSERT("charlie" == move);
+  CU_ASSERT(7 == move.size());
+  CU_ASSERT("" == copy);
+  CU_ASSERT(0 == copy.size());
+
+  // move assignment
+  move = std::move(from_cstr);
+
+  CU_ASSERT("alpha" == move);
+  CU_ASSERT(5 == move.size());
+  CU_ASSERT("" == from_cstr);
+  CU_ASSERT(0 == from_cstr.size());
+
+  // from string literal
+  auto from_lit = StringRef::from_lit("bravo");
+
+  CU_ASSERT("bravo" == from_lit);
+  CU_ASSERT(5 == from_lit.size());
+
+  // equality
+  ImmutableString eq("delta");
+
+  CU_ASSERT("delta1" != eq);
+  CU_ASSERT("delt" != eq);
+  CU_ASSERT(eq != "delta1");
+  CU_ASSERT(eq != "delt");
+
+  // operator[]
+  ImmutableString br_op("foxtrot");
+
+  CU_ASSERT('f' == br_op[0]);
+  CU_ASSERT('o' == br_op[1]);
+  CU_ASSERT('t' == br_op[6]);
+  CU_ASSERT('\0' == br_op[7]);
+
+  // operator==(const ImmutableString &, const ImmutableString &)
+  {
+    ImmutableString a("foo");
+    ImmutableString b("foo");
+    ImmutableString c("fo");
+
+    CU_ASSERT(a == b);
+    CU_ASSERT(a != c);
+    CU_ASSERT(c != b);
+  }
+
+  // operator<<
+  {
+    ImmutableString a("foo");
+    std::stringstream ss;
+    ss << a;
+
+    CU_ASSERT("foo" == ss.str());
+  }
+
+  // operator +=(std::string &, const ImmutableString &)
+  {
+    std::string a = "alpha";
+    a += ImmutableString("bravo");
+
+    CU_ASSERT("alphabravo" == a);
+  }
+}
+
+void test_template_string_ref(void) {
+  StringRef empty;
+
+  CU_ASSERT("" == empty);
+  CU_ASSERT(0 == empty.size());
+
+  // from std::string
+  std::string alpha = "alpha";
+
+  StringRef ref(alpha);
+
+  CU_ASSERT("alpha" == ref);
+  CU_ASSERT(ref == "alpha");
+  CU_ASSERT(alpha == ref);
+  CU_ASSERT(ref == alpha);
+  CU_ASSERT(5 == ref.size());
+
+  // from string literal
+  auto from_lit = StringRef::from_lit("alpha");
+
+  CU_ASSERT("alpha" == from_lit);
+  CU_ASSERT(5 == from_lit.size());
+
+  // from ImmutableString
+  auto im = ImmutableString::from_lit("bravo");
+
+  StringRef imref(im);
+
+  CU_ASSERT("bravo" == imref);
+  CU_ASSERT(5 == imref.size());
+
+  // from C-string
+  StringRef cstrref("charlie");
+
+  CU_ASSERT("charlie" == cstrref);
+  CU_ASSERT(7 == cstrref.size());
+
+  // from C-string and its length
+  StringRef cstrnref("delta", 5);
+
+  CU_ASSERT("delta" == cstrnref);
+  CU_ASSERT(5 == cstrnref.size());
+
+  // operator[]
+  StringRef br_op("foxtrot");
+
+  CU_ASSERT('f' == br_op[0]);
+  CU_ASSERT('o' == br_op[1]);
+  CU_ASSERT('t' == br_op[6]);
+  CU_ASSERT('\0' == br_op[7]);
+
+  // operator<<
+  {
+    StringRef a("foo");
+    std::stringstream ss;
+    ss << a;
+
+    CU_ASSERT("foo" == ss.str());
+  }
+
+  // operator +=(std::string &, const StringRef &)
+  {
+    std::string a = "alpha";
+    a += StringRef("bravo");
+
+    CU_ASSERT("alphabravo" == a);
+  }
+}
+
+} // namespace nghttp2