Increased test coverage

extras/tests/Cpp11/nullptr.cpp

@@ -29,6 +29,14 @@ TEST_CASE("nullptr") {
     REQUIRE(variant.isNull());
   }
 
+  SECTION("JsonVariant.set(nullptr) with unbound reference") {
+    JsonVariant unboundReference;
+
+    unboundReference.set(nullptr);
+
+    REQUIRE(variant.isNull());
+  }
+
   SECTION("JsonVariant.is<nullptr_t>()") {
     variant.set(42);
     REQUIRE(variant.is<std::nullptr_t>() == false);

extras/tests/JsonArray/remove.cpp

@@ -7,73 +7,83 @@
 
 TEST_CASE("JsonArray::remove()") {
   DynamicJsonDocument doc(4096);
-  JsonArray _array = doc.to<JsonArray>();
-  _array.add(1);
-  _array.add(2);
-  _array.add(3);
+  JsonArray array = doc.to<JsonArray>();
+  array.add(1);
+  array.add(2);
+  array.add(3);
 
-  SECTION("RemoveFirstByIndex") {
-    _array.remove(0);
+  SECTION("remove first by index") {
+    array.remove(0);
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 2);
-    REQUIRE(_array[1] == 3);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 2);
+    REQUIRE(array[1] == 3);
   }
 
-  SECTION("RemoveMiddleByIndex") {
-    _array.remove(1);
+  SECTION("remove middle by index") {
+    array.remove(1);
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 1);
-    REQUIRE(_array[1] == 3);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 1);
+    REQUIRE(array[1] == 3);
   }
 
-  SECTION("RemoveLastByIndex") {
-    _array.remove(2);
+  SECTION("remove last by index") {
+    array.remove(2);
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 1);
-    REQUIRE(_array[1] == 2);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 1);
+    REQUIRE(array[1] == 2);
   }
 
-  SECTION("RemoveFirstByIterator") {
-    JsonArray::iterator it = _array.begin();
-    _array.remove(it);
+  SECTION("remove first by iterator") {
+    JsonArray::iterator it = array.begin();
+    array.remove(it);
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 2);
-    REQUIRE(_array[1] == 3);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 2);
+    REQUIRE(array[1] == 3);
   }
 
-  SECTION("RemoveMiddleByIterator") {
-    JsonArray::iterator it = _array.begin();
+  SECTION("remove middle by iterator") {
+    JsonArray::iterator it = array.begin();
     ++it;
-    _array.remove(it);
+    array.remove(it);
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 1);
-    REQUIRE(_array[1] == 3);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 1);
+    REQUIRE(array[1] == 3);
   }
 
-  SECTION("RemoveLastByIterator") {
-    JsonArray::iterator it = _array.begin();
+  SECTION("remove last bty iterator") {
+    JsonArray::iterator it = array.begin();
     ++it;
     ++it;
-    _array.remove(it);
+    array.remove(it);
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 1);
-    REQUIRE(_array[1] == 2);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 1);
+    REQUIRE(array[1] == 2);
   }
 
   SECTION("In a loop") {
-    for (JsonArray::iterator it = _array.begin(); it != _array.end(); ++it) {
+    for (JsonArray::iterator it = array.begin(); it != array.end(); ++it) {
       if (*it == 2)
-        _array.remove(it);
+        array.remove(it);
     }
 
-    REQUIRE(2 == _array.size());
-    REQUIRE(_array[0] == 1);
-    REQUIRE(_array[1] == 3);
+    REQUIRE(2 == array.size());
+    REQUIRE(array[0] == 1);
+    REQUIRE(array[1] == 3);
+  }
+
+  SECTION("remove by index on unbound reference") {
+    JsonArray unboundArray;
+    unboundArray.remove(20);
+  }
+
+  SECTION("remove by iterator on unbound reference") {
+    JsonArray unboundArray;
+    unboundArray.remove(unboundArray.begin());
   }
 }

extras/tests/JsonObject/remove.cpp

@@ -70,8 +70,13 @@ TEST_CASE("JsonObject::remove()") {
   }
 #endif
 
-  SECTION("should work on null object") {
-    JsonObject null;
-    null.remove("key");
+  SECTION("remove by key on unbound reference") {
+    JsonObject unboundObject;
+    unboundObject.remove("key");
+  }
+
+  SECTION("remove by iterator on unbound reference") {
+    JsonObject unboundObject;
+    unboundObject.remove(unboundObject.begin());
   }
 }

extras/tests/JsonVariant/add.cpp

@@ -10,21 +10,37 @@ TEST_CASE("JsonVariant::add()") {
   DynamicJsonDocument doc(4096);
   JsonVariant var = doc.to<JsonVariant>();
 
-  SECTION("integer") {
+  SECTION("add integer to new variant") {
     var.add(42);
 
     REQUIRE(var.as<std::string>() == "[42]");
   }
 
-  SECTION("const char*") {
+  SECTION("add const char* to new variant") {
     var.add("hello");
 
     REQUIRE(var.as<std::string>() == "[\"hello\"]");
   }
 
-  SECTION("std::string") {
+  SECTION("add std::string to new variant") {
     var.add(std::string("hello"));
 
     REQUIRE(var.as<std::string>() == "[\"hello\"]");
   }
+
+  SECTION("add integer to integer") {
+    var.set(123);
+
+    var.add(456);  // no-op
+
+    REQUIRE(var.as<std::string>() == "123");
+  }
+
+  SECTION("add integer to object") {
+    var["val"] = 123;
+
+    var.add(456);  // no-op
+
+    REQUIRE(var.as<std::string>() == "{\"val\":123}");
+  }
 }

extras/tests/JsonVariant/compare.cpp

@@ -158,6 +158,18 @@ TEST_CASE("Compare JsonVariant with JsonVariant") {
     CHECK_FALSE(a > b);
   }
 
+  SECTION("42 vs 42U") {
+    a.set(42);
+    b.set(42U);
+
+    CHECK(a == b);
+    CHECK(a <= b);
+    CHECK(a >= b);
+    CHECK_FALSE(a != b);
+    CHECK_FALSE(a < b);
+    CHECK_FALSE(a > b);
+  }
+
   SECTION("42 vs 42.0") {
     a.set(42);
     b.set(42.0);
@@ -230,6 +242,30 @@ TEST_CASE("Compare JsonVariant with JsonVariant") {
     CHECK_FALSE(a == b);
   }
 
+  SECTION("42U vs 42U") {
+    a.set(42U);
+    b.set(42U);
+
+    CHECK(a == b);
+    CHECK(a <= b);
+    CHECK(a >= b);
+    CHECK_FALSE(a != b);
+    CHECK_FALSE(a < b);
+    CHECK_FALSE(a > b);
+  }
+
+  SECTION("42U vs 42") {
+    a.set(42U);
+    b.set(42);
+
+    CHECK(a == b);
+    CHECK(a <= b);
+    CHECK(a >= b);
+    CHECK_FALSE(a != b);
+    CHECK_FALSE(a < b);
+    CHECK_FALSE(a > b);
+  }
+
   SECTION("[1] vs [1]") {
     a.add(1);
     b.add(1);

extras/tests/JsonVariant/copy.cpp

@@ -83,4 +83,13 @@ TEST_CASE("JsonVariant::set(JsonVariant)") {
     REQUIRE(doc1.memoryUsage() == JSON_STRING_SIZE(7));
     REQUIRE(doc2.memoryUsage() == JSON_STRING_SIZE(7));
   }
+
+  SECTION("destination is unbound") {
+    JsonVariant unboundVariant;
+
+    unboundVariant.set(var1);
+
+    REQUIRE(unboundVariant.isUndefined());
+    REQUIRE(unboundVariant.isNull());
+  }
 }

extras/tests/JsonVariant/subscript.cpp

@@ -58,6 +58,15 @@ TEST_CASE("JsonVariant::operator[]") {
       REQUIRE(1 == var[0].size());
       REQUIRE(std::string("world") == var[0]["hello"]);
     }
+
+    SECTION("variant[0] when variant contains an integer") {
+      var.set(123);
+
+      var[0] = 345;  // no-op
+
+      REQUIRE(var.is<int>());
+      REQUIRE(var.as<int>() == 123);
+    }
   }
 
   SECTION("The JsonVariant is a JsonObject") {

extras/tests/Misc/StringWriter.cpp

@@ -15,6 +15,11 @@ static size_t print(StringWriter& writer, const char* s) {
   return writer.write(reinterpret_cast<const uint8_t*>(s), strlen(s));
 }
 
+template <typename StringWriter>
+static size_t print(StringWriter& writer, char c) {
+  return writer.write(static_cast<uint8_t>(c));
+}
+
 template <typename StringWriter, typename String>
 void common_tests(StringWriter& writer, const String& output) {
   SECTION("InitialState") {
@@ -47,6 +52,7 @@ TEST_CASE("StaticStringWriter") {
   SECTION("OverCapacity") {
     REQUIRE(20 == print(writer, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
     REQUIRE(0 == print(writer, "ABC"));
+    REQUIRE(0 == print(writer, 'D'));
     REQUIRE("ABCDEFGHIJKLMNOPQRST" == std::string(output, 20));
   }
 }

src/ArduinoJson/Variant/VariantContent.hpp

@@ -12,7 +12,6 @@
 
 namespace ARDUINOJSON_NAMESPACE {
 
-//
 enum {
   VALUE_MASK = 0x7F,