Made deserializeJson() more picky about trailing characters (closes #980)

test/JsonDeserializer/invalid_input.cpp

@@ -8,7 +8,8 @@
 
 TEST_CASE("Invalid JSON input") {
   const char* testCases[] = {"'\\u'",     "'\\u000g'", "'\\u000'", "'\\u000G'",
-                             "'\\u000/'", "\\x1234",   "6a9"};
+                             "'\\u000/'", "\\x1234",   "6a9",      "1,",
+                             "2]",        "3}"};
   const size_t testCount = sizeof(testCases) / sizeof(testCases[0]);
 
   DynamicJsonDocument doc(4096);

test/Misc/CMakeLists.txt

@@ -5,6 +5,7 @@
 add_executable(MiscTests
 	conflicts.cpp
 	FloatParts.cpp
+	StreamReader.cpp
 	StringWriter.cpp
 	TypeTraits.cpp
 	unsigned_char.cpp

test/Misc/StreamReader.cpp

@@ -0,0 +1,33 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("StdStreamReader") {
+  std::istringstream src("\x01\xFF");
+  StdStreamReader reader(src);
+
+  REQUIRE(reader.read() == 0x01);
+  REQUIRE(reader.read() == 0xFF);
+  REQUIRE(reader.read() == -1);
+}
+
+TEST_CASE("SafeCharPointerReader") {
+  SafeCharPointerReader reader("\x01\xFF", 2);
+
+  REQUIRE(reader.read() == 0x01);
+  REQUIRE(reader.read() == 0xFF);
+  REQUIRE(reader.read() == -1);
+}
+
+TEST_CASE("UnsafeCharPointerReader") {
+  UnsafeCharPointerReader reader("\x01\xFF");
+
+  REQUIRE(reader.read() == 0x01);
+  REQUIRE(reader.read() == 0xFF);
+  REQUIRE(reader.read() == 0);
+}