add missing lib

lib/ArduinoJson/test/Misc/StringBuilder.cpp

@@ -0,0 +1,50 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ArduinoJson::Internals;
+
+template <typename StringBuilder, typename String>
+void common_tests(StringBuilder& sb, const String& output) {
+  SECTION("InitialState") {
+    REQUIRE(std::string("") == output);
+  }
+
+  SECTION("EmptyString") {
+    REQUIRE(0 == sb.print(""));
+    REQUIRE(std::string("") == output);
+  }
+
+  SECTION("OneString") {
+    REQUIRE(4 == sb.print("ABCD"));
+    REQUIRE(std::string("ABCD") == output);
+  }
+
+  SECTION("TwoStrings") {
+    REQUIRE(4 == sb.print("ABCD"));
+    REQUIRE(4 == sb.print("EFGH"));
+    REQUIRE(std::string("ABCDEFGH") == output);
+  }
+}
+
+TEST_CASE("StaticStringBuilder") {
+  char output[20];
+  StaticStringBuilder sb(output, sizeof(output));
+
+  common_tests(sb, static_cast<const char*>(output));
+
+  SECTION("OverCapacity") {
+    REQUIRE(19 == sb.print("ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
+    REQUIRE(0 == sb.print("ABC"));
+    REQUIRE(std::string("ABCDEFGHIJKLMNOPQRS") == output);
+  }
+}
+
+TEST_CASE("DynamicStringBuilder") {
+  std::string output;
+  DynamicStringBuilder<std::string> sb(output);
+  common_tests(sb, output);
+}