Set version to 5.6.4

CHANGELOG.md

@@ -1,6 +1,18 @@
 ArduinoJson: change log
 =======================
 
+v5.6.4
+------
+
+* Fixed error in float serialization (issue #324)
+
+v5.6.3
+------
+
+* Improved speed of float serialization (about twice faster)
+* Added `as<JsonArray>()` as a synonym for `as<JsonArray&>()`... (issue #291)
+* Fixed `call of overloaded isinf(double&) is ambiguous` (issue #284)
+
 v5.6.2
 ------
 
@@ -105,7 +117,7 @@ v5.0.3
 v5.0.2
 ------
 
-* Fixed segmentation fault in `parseObject(String)` and `parseArray(String)`, when the 
+* Fixed segmentation fault in `parseObject(String)` and `parseArray(String)`, when the
   `StaticJsonBuffer` is too small to hold a copy of the string
 * Fixed Clang warning "register specifier is deprecated" (issue #102)
 * Fixed GCC warning "declaration shadows a member" (issue #103)
@@ -221,14 +233,14 @@ v3.1
 
 Old generator API:
 
-	JsonObject<3> root; 
+	JsonObject<3> root;
     root.add("sensor", "gps");
     root.add("time", 1351824120);
     root.add("data", array);
 
 New generator API:
 
-	JsonObject<3> root; 
+	JsonObject<3> root;
     root["sensor"] = "gps";
     root["time"] = 1351824120;
     root["data"] = array;
@@ -285,7 +297,7 @@ v1.1
 * Example: changed `char* json` into `char[] json` so that the bytes are not write protected
 * Fixed parsing bug when the JSON contains multi-dimensional arrays
 
-v1.0 
+v1.0
 ----
 
 Initial release

appveyor.yml

@@ -1,11 +1,13 @@
-version: 5.6.2.{build}
+version: 5.6.4.{build}
 environment:
   matrix:
   - CMAKE_GENERATOR: Visual Studio 14 2015
   - CMAKE_GENERATOR: Visual Studio 12 2013
   - CMAKE_GENERATOR: Visual Studio 11 2012
   - CMAKE_GENERATOR: Visual Studio 10 2010
-  - CMAKE_GENERATOR: MinGW Makefiles
+#  - CMAKE_GENERATOR: MinGW Makefiles
+# Note: Disabled because of unexplicated error -1073741511
+# This used to work fine with GCC 4.8.2 then failed after they upgraded to GCC 4.9.3
 configuration: Debug
 before_build:
 - set PATH=C:\MinGW\bin;%PATH:C:\Program Files\Git\usr\bin;=% # Workaround for CMake not wanting sh.exe on PATH for MinGW

include/ArduinoJson/Internals/JsonVariantAs.hpp

@@ -0,0 +1,45 @@
+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#pragma once
+
+namespace ArduinoJson {
+namespace Internals {
+
+// A metafunction that returns the type of the value returned by
+// JsonVariant::as<T>()
+template <typename T>
+struct JsonVariantAs {
+  typedef T type;
+};
+
+template <>
+struct JsonVariantAs<char*> {
+  typedef const char* type;
+};
+
+template <>
+struct JsonVariantAs<JsonArray> {
+  typedef JsonArray& type;
+};
+
+template <>
+struct JsonVariantAs<const JsonArray> {
+  typedef const JsonArray& type;
+};
+
+template <>
+struct JsonVariantAs<JsonObject> {
+  typedef JsonObject& type;
+};
+
+template <>
+struct JsonVariantAs<const JsonObject> {
+  typedef const JsonObject& type;
+};
+}
+}

include/ArduinoJson/Internals/JsonWriter.hpp

@@ -81,7 +81,7 @@ class JsonWriter {
     }
   }
 
-  void writeFloat(JsonFloat value, int digits = 2) {
+  void writeFloat(JsonFloat value, uint8_t digits = 2) {
     if (Polyfills::isNaN(value)) return writeRaw("NaN");
 
     if (value < 0.0) {
@@ -98,11 +98,8 @@ class JsonWriter {
       powersOf10 = 0;
     }
 
-    // Round correctly so that print(1.999, 2) prints as "2.00"
-    JsonFloat rounding = 0.5;
-    for (uint8_t i = 0; i < digits; ++i) rounding /= 10.0;
-
-    value += rounding;
+    // Round up last digit (so that print(1.999, 2) prints as "2.00")
+    value += getRoundingBias(digits);
 
     // Extract the integer part of the value and print it
     JsonUInt int_part = static_cast<JsonUInt>(value);
@@ -116,10 +113,13 @@ class JsonWriter {
 
     // Extract digits from the remainder one at a time
     while (digits-- > 0) {
+      // Extract digit
       remainder *= 10.0;
-      JsonUInt toPrint = JsonUInt(remainder);
-      writeInteger(JsonUInt(remainder));
-      remainder -= static_cast<JsonFloat>(toPrint);
+      char currentDigit = char(remainder);
+      remainder -= static_cast<JsonFloat>(currentDigit);
+
+      // Print
+      writeRaw(char('0' + currentDigit));
     }
 
     if (powersOf10 < 0) {
@@ -135,16 +135,15 @@ class JsonWriter {
 
   void writeInteger(JsonUInt value) {
     char buffer[22];
+    char *ptr = buffer + sizeof(buffer) - 1;
 
-    uint8_t i = 0;
+    *ptr = 0;
     do {
-      buffer[i++] = static_cast<char>(value % 10 + '0');
+      *--ptr = static_cast<char>(value % 10 + '0');
       value /= 10;
     } while (value);
 
-    while (i > 0) {
-      writeRaw(buffer[--i]);
-    }
+    writeRaw(ptr);
   }
 
   void writeRaw(const char *s) {
@@ -160,6 +159,26 @@ class JsonWriter {
 
  private:
   JsonWriter &operator=(const JsonWriter &);  // cannot be assigned
+
+  static JsonFloat getLastDigit(uint8_t digits) {
+    // Designed as a compromise between code size and speed
+    switch (digits) {
+      case 0:
+        return 1e-0;
+      case 1:
+        return 1e-1;
+      case 2:
+        return 1e-2;
+      case 3:
+        return 1e-3;
+      default:
+        return getLastDigit(uint8_t(digits - 4)) * 1e-4;
+    }
+  }
+
+  FORCE_INLINE static JsonFloat getRoundingBias(uint8_t digits) {
+    return 0.5 * getLastDigit(digits);
+  }
 };
 }
 }

include/ArduinoJson/JsonArray.hpp

@@ -137,7 +137,7 @@ class JsonArray : public Internals::JsonPrintable<JsonArray>,
 
   // Gets the value at the specified index.
   template <typename T>
-  T get(size_t index) const {
+  typename Internals::JsonVariantAs<T>::type get(size_t index) const {
     node_type *node = getNodeAt(index);
     return node ? node->content.as<T>() : JsonVariant::defaultValue<T>();
   }

include/ArduinoJson/JsonArray.ipp

@@ -21,13 +21,23 @@ inline bool JsonArray::setNodeValue(node_type *node, String &value) {
   return true;
 }
 
+template <>
+inline JsonArray &JsonVariant::defaultValue<JsonArray>() {
+  return JsonArray::invalid();
+}
+
 template <>
 inline JsonArray &JsonVariant::defaultValue<JsonArray &>() {
   return JsonArray::invalid();
 }
 
 template <>
-inline JsonArray const &JsonVariant::defaultValue<JsonArray const &>() {
+inline const JsonArray &JsonVariant::defaultValue<const JsonArray>() {
+  return JsonArray::invalid();
+}
+
+template <>
+inline const JsonArray &JsonVariant::defaultValue<const JsonArray &>() {
   return JsonArray::invalid();
 }
 

include/ArduinoJson/JsonArraySubscript.hpp

@@ -42,12 +42,16 @@ class JsonArraySubscript : public JsonVariantBase<JsonArraySubscript> {
     return *this;
   }
 
-  FORCE_INLINE bool success() const { return _index < _array.size(); }
+  FORCE_INLINE bool success() const {
+    return _index < _array.size();
+  }
 
-  FORCE_INLINE operator JsonVariant() const { return _array.get(_index); }
+  FORCE_INLINE operator JsonVariant() const {
+    return _array.get(_index);
+  }
 
   template <typename T>
-  FORCE_INLINE T as() const {
+  FORCE_INLINE typename Internals::JsonVariantAs<T>::type as() const {
     return _array.get<T>(_index);
   }
 

include/ArduinoJson/JsonObject.hpp

@@ -106,7 +106,7 @@ class JsonObject : public Internals::JsonPrintable<JsonObject>,
 
   // Gets the value associated with the specified key.
   template <typename T>
-  T get(JsonObjectKey key) const {
+  typename Internals::JsonVariantAs<T>::type get(JsonObjectKey key) const {
     node_type* node = getNodeAt(key.c_str());
     return node ? node->content.value.as<T>() : JsonVariant::defaultValue<T>();
   }

include/ArduinoJson/JsonObject.ipp

@@ -26,7 +26,12 @@ inline bool JsonObject::setNodeValue(node_type *node, const String &value) {
 }
 
 template <>
-inline JsonObject const &JsonVariant::defaultValue<JsonObject const &>() {
+inline const JsonObject &JsonVariant::defaultValue<const JsonObject &>() {
+  return JsonObject::invalid();
+}
+
+template <>
+inline const JsonObject &JsonVariant::defaultValue<const JsonObject>() {
   return JsonObject::invalid();
 }
 
@@ -35,6 +40,11 @@ inline JsonObject &JsonVariant::defaultValue<JsonObject &>() {
   return JsonObject::invalid();
 }
 
+template <>
+inline JsonObject &JsonVariant::defaultValue<JsonObject>() {
+  return JsonObject::invalid();
+}
+
 inline JsonObject &JsonVariant::asObject() const {
   if (_type == Internals::JSON_OBJECT) return *_content.asObject;
   return JsonObject::invalid();

include/ArduinoJson/JsonObjectSubscript.hpp

@@ -54,7 +54,7 @@ class JsonObjectSubscript : public JsonVariantBase<JsonObjectSubscript<TKey> > {
   }
 
   template <typename TValue>
-  FORCE_INLINE TValue as() const {
+  FORCE_INLINE typename Internals::JsonVariantAs<TValue>::type as() const {
     return _object.get<TValue>(_key);
   }
 

include/ArduinoJson/JsonVariant.hpp

@@ -177,28 +177,43 @@ class JsonVariant : public JsonVariantBase<JsonVariant> {
   //
   // JsonArray& as<JsonArray> const;
   // JsonArray& as<JsonArray&> const;
-  // JsonArray& as<const JsonArray&> const;
   template <typename T>
   typename TypeTraits::EnableIf<
-      TypeTraits::IsSame<
-          typename TypeTraits::RemoveConst<
-              typename TypeTraits::RemoveReference<T>::type>::type,
-          JsonArray>::value,
+      TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
+                         JsonArray>::value,
       JsonArray &>::type
   as() const {
     return asArray();
   }
   //
+  // const JsonArray& as<const JsonArray&> const;
+  template <typename T>
+  typename TypeTraits::EnableIf<
+      TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
+                         const JsonArray>::value,
+      const JsonArray &>::type
+  as() const {
+    return asArray();
+  }
+  //
   // JsonObject& as<JsonObject> const;
   // JsonObject& as<JsonObject&> const;
+  template <typename T>
+  typename TypeTraits::EnableIf<
+      TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
+                         JsonObject>::value,
+      JsonObject &>::type
+  as() const {
+    return asObject();
+  }
+  //
+  // JsonObject& as<const JsonObject> const;
   // JsonObject& as<const JsonObject&> const;
   template <typename T>
   typename TypeTraits::EnableIf<
-      TypeTraits::IsSame<
-          typename TypeTraits::RemoveConst<
-              typename TypeTraits::RemoveReference<T>::type>::type,
-          JsonObject>::value,
-      JsonObject &>::type
+      TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
+                         const JsonObject>::value,
+      const JsonObject &>::type
   as() const {
     return asObject();
   }
@@ -281,7 +296,7 @@ class JsonVariant : public JsonVariantBase<JsonVariant> {
 
   // Value returned if the variant has an incompatible type
   template <typename T>
-  static T defaultValue() {
+  static typename Internals::JsonVariantAs<T>::type defaultValue() {
     return T();
   }
 

include/ArduinoJson/JsonVariantBase.hpp

@@ -7,8 +7,9 @@
 
 #pragma once
 
-#include "Polyfills/attributes.hpp"
+#include "Internals/JsonVariantAs.hpp"
 #include "JsonObjectKey.hpp"
+#include "Polyfills/attributes.hpp"
 
 namespace ArduinoJson {
 
@@ -20,20 +21,35 @@ class JsonObjectSubscript;
 template <typename TImpl>
 class JsonVariantBase : public Internals::JsonPrintable<TImpl> {
  public:
-  FORCE_INLINE const char *asString() const { return as<const char *>(); }
+  // DEPRECATED: use as<char*>() instead
+  FORCE_INLINE const char *asString() const {
+    return as<const char *>();
+  }
 
   // Gets the variant as an array.
   // Returns a reference to the JsonArray or JsonArray::invalid() if the
   // variant
   // is not an array.
-  FORCE_INLINE operator JsonArray &() const { return as<JsonArray &>(); }
-  FORCE_INLINE JsonArray &asArray() const { return as<JsonArray &>(); }
+  FORCE_INLINE operator JsonArray &() const {
+    return as<JsonArray &>();
+  }
+
+  // DEPRECATED: use as<JsonArray>() instead
+  FORCE_INLINE JsonArray &asArray() const {
+    return as<JsonArray &>();
+  }
 
   // Gets the variant as an object.
   // Returns a reference to the JsonObject or JsonObject::invalid() if the
   // variant is not an object.
-  FORCE_INLINE operator JsonObject &() const { return as<JsonObject &>(); }
-  FORCE_INLINE JsonObject &asObject() const { return as<JsonObject &>(); }
+  FORCE_INLINE operator JsonObject &() const {
+    return as<JsonObject &>();
+  }
+
+  // DEPRECATED: use as<JsonObject>() instead
+  FORCE_INLINE JsonObject &asObject() const {
+    return as<JsonObject &>();
+  }
 
   template <typename T>
   FORCE_INLINE operator T() const {
@@ -41,14 +57,16 @@ class JsonVariantBase : public Internals::JsonPrintable<TImpl> {
   }
 
   template <typename T>
-  FORCE_INLINE const T as() const {
+  FORCE_INLINE const typename Internals::JsonVariantAs<T>::type as() const {
     return impl()->template as<T>();
   }
 
   // Mimics an array or an object.
   // Returns the size of the array or object if the variant has that type.
   // Returns 0 if the variant is neither an array nor an object
-  size_t size() const { return asArray().size() + asObject().size(); }
+  size_t size() const {
+    return asArray().size() + asObject().size();
+  }
 
   // Mimics an array.
   // Returns the element at specified index if the variant is an array.
@@ -68,7 +86,9 @@ class JsonVariantBase : public Internals::JsonPrintable<TImpl> {
   void writeTo(Internals::JsonWriter &writer) const;
 
  private:
-  const TImpl *impl() const { return static_cast<const TImpl *>(this); }
+  const TImpl *impl() const {
+    return static_cast<const TImpl *>(this);
+  }
 };
 
 template <typename TImpl, typename TComparand>

include/ArduinoJson/Polyfills/math.hpp

@@ -62,6 +62,20 @@ bool isNaN(T x) {
   return isnan(x);
 }
 
+#if defined(_GLIBCXX_HAVE_ISNANL) && _GLIBCXX_HAVE_ISNANL
+template <>
+inline bool isNaN<double>(double x) {
+  return isnanl(x);
+}
+#endif
+
+#if defined(_GLIBCXX_HAVE_ISNANF) && _GLIBCXX_HAVE_ISNANF
+template <>
+inline bool isNaN<float>(float x) {
+  return isnanf(x);
+}
+#endif
+
 template <typename T>
 bool isInfinity(T x) {
 // Workaround for libs that #undef isinf
@@ -73,6 +87,20 @@ bool isInfinity(T x) {
   return isinf(x);
 }
 
+#if defined(_GLIBCXX_HAVE_ISINFL) && _GLIBCXX_HAVE_ISINFL
+template <>
+inline bool isInfinity<double>(double x) {
+  return isinfl(x);
+}
+#endif
+
+#if defined(_GLIBCXX_HAVE_ISINFF) && _GLIBCXX_HAVE_ISINFF
+template <>
+inline bool isInfinity<float>(float x) {
+  return isinff(x);
+}
+#endif
+
 #if defined(__GNUC__)
 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
 #pragma GCC diagnostic pop

library.json

@@ -6,7 +6,7 @@
     "type": "git",
     "url": "https://github.com/bblanchon/ArduinoJson.git"
   },
-  "version": "5.6.2",
+  "version": "5.6.4",
   "authors": {
     "name": "Benoit Blanchon",
     "url": "http://blog.benoitblanchon.fr"

library.properties

@@ -1,5 +1,5 @@
 name=ArduinoJson
-version=5.6.2
+version=5.6.4
 author=Benoit Blanchon <blog.benoitblanchon.fr>
 maintainer=Benoit Blanchon <blog.benoitblanchon.fr>
 sentence=An efficient and elegant JSON library for Arduino.

test/JsonArray_Subscript_Tests.cpp

@@ -59,6 +59,7 @@ TEST_(StoreBoolean) {
 TEST_(StoreString) {
   _array[0] = "hello";
   EXPECT_STREQ("hello", _array[0].as<const char*>());
+  EXPECT_STREQ("hello", _array[0].as<char*>());  // <- short hand
   EXPECT_TRUE(_array[0].is<const char*>());
   EXPECT_FALSE(_array[0].is<int>());
 }
@@ -69,6 +70,9 @@ TEST_(StoreNestedArray) {
   _array[0] = arr;
 
   EXPECT_EQ(&arr, &_array[0].as<JsonArray&>());
+  EXPECT_EQ(&arr, &_array[0].as<JsonArray>());  // <- short hand
+  EXPECT_EQ(&arr, &_array[0].as<const JsonArray&>());
+  EXPECT_EQ(&arr, &_array[0].as<const JsonArray>());  // <- short hand
   EXPECT_TRUE(_array[0].is<JsonArray&>());
   EXPECT_FALSE(_array[0].is<int>());
 }
@@ -79,6 +83,9 @@ TEST_(StoreNestedObject) {
   _array[0] = obj;
 
   EXPECT_EQ(&obj, &_array[0].as<JsonObject&>());
+  EXPECT_EQ(&obj, &_array[0].as<JsonObject>());  // <- short hand
+  EXPECT_EQ(&obj, &_array[0].as<const JsonObject&>());
+  EXPECT_EQ(&obj, &_array[0].as<const JsonObject>());  // <- short hand
   EXPECT_TRUE(_array[0].is<JsonObject&>());
   EXPECT_FALSE(_array[0].is<int>());
 }

test/JsonObject_Subscript_Tests.cpp

@@ -68,6 +68,7 @@ TEST_(StoreString) {
   EXPECT_TRUE(_object["hello"].is<const char*>());
   EXPECT_FALSE(_object["hello"].is<long>());
   EXPECT_STREQ("h3110", _object["hello"].as<const char*>());
+  EXPECT_STREQ("h3110", _object["hello"].as<char*>());  // <- short hand
 }
 
 TEST_(StoreArray) {
@@ -75,8 +76,15 @@ TEST_(StoreArray) {
 
   _object["hello"] = arr;
 
-  EXPECT_EQ(&arr, &_object["hello"].asArray());
+  EXPECT_EQ(&arr, &_object["hello"].asArray());  // <- DEPRECATED
+  EXPECT_EQ(&arr, &_object["hello"].as<JsonArray&>());
+  EXPECT_EQ(&arr, &_object["hello"].as<JsonArray>());  // <- short hand
+  EXPECT_EQ(&arr, &_object["hello"].as<const JsonArray&>());
+  EXPECT_EQ(&arr, &_object["hello"].as<const JsonArray>());  // <- short hand
   EXPECT_TRUE(_object["hello"].is<JsonArray&>());
+  EXPECT_TRUE(_object["hello"].is<JsonArray>());
+  EXPECT_TRUE(_object["hello"].is<const JsonArray&>());
+  EXPECT_TRUE(_object["hello"].is<const JsonArray>());
   EXPECT_FALSE(_object["hello"].is<JsonObject&>());
 }
 
@@ -85,8 +93,15 @@ TEST_(StoreObject) {
 
   _object["hello"] = obj;
 
-  EXPECT_EQ(&obj, &_object["hello"].asObject());
+  EXPECT_EQ(&obj, &_object["hello"].asObject());  // DEPRECATED
+  EXPECT_EQ(&obj, &_object["hello"].as<JsonObject&>());
+  EXPECT_EQ(&obj, &_object["hello"].as<JsonObject>());  // <- short hand
+  EXPECT_EQ(&obj, &_object["hello"].as<const JsonObject&>());
+  EXPECT_EQ(&obj, &_object["hello"].as<const JsonObject>());  // <- short hand
   EXPECT_TRUE(_object["hello"].is<JsonObject&>());
+  EXPECT_TRUE(_object["hello"].is<JsonObject>());
+  EXPECT_TRUE(_object["hello"].is<const JsonObject&>());
+  EXPECT_TRUE(_object["hello"].is<const JsonObject>());
   EXPECT_FALSE(_object["hello"].is<JsonArray&>());
 }
 

test/JsonVariant_As_Tests.cpp

@@ -214,3 +214,21 @@ TEST(JsonVariant_As_Tests, ArrayAsString) {
   JsonVariant variant = arr;
   ASSERT_EQ(String("[4,2]"), variant.as<String>());
 }
+
+TEST(JsonVariant_As_Tests, ArrayAsJsonArray) {
+  DynamicJsonBuffer buffer;
+  JsonArray& arr = buffer.createArray();
+
+  JsonVariant variant = arr;
+  ASSERT_EQ(&arr, &variant.as<JsonArray&>());
+  ASSERT_EQ(&arr, &variant.as<JsonArray>());  // <- shorthand
+}
+
+TEST(JsonVariant_As_Tests, ObjectAsJsonObject) {
+  DynamicJsonBuffer buffer;
+  JsonObject& arr = buffer.createObject();
+
+  JsonVariant variant = arr;
+  ASSERT_EQ(&arr, &variant.as<JsonObject&>());
+  ASSERT_EQ(&arr, &variant.as<JsonObject>());  // <- shorthand
+}

test/JsonWriter_WriteFloat_Tests.cpp

@@ -0,0 +1,113 @@
+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#include <gtest/gtest.h>
+#include <limits>
+
+#include <ArduinoJson/Internals/JsonWriter.hpp>
+#include <ArduinoJson/Internals/StaticStringBuilder.hpp>
+
+using namespace ArduinoJson::Internals;
+
+class JsonWriter_WriteFloat_Tests : public testing::Test {
+ protected:
+  void whenInputIs(double input, uint8_t digits = 2) {
+    StaticStringBuilder sb(buffer, sizeof(buffer));
+    JsonWriter writer(sb);
+    writer.writeFloat(input, digits);
+    returnValue = writer.bytesWritten();
+  }
+
+  void outputMustBe(const char *expected) {
+    EXPECT_STREQ(expected, buffer);
+    EXPECT_EQ(strlen(expected), returnValue);
+  }
+
+ private:
+  char buffer[1024];
+  size_t returnValue;
+};
+
+TEST_F(JsonWriter_WriteFloat_Tests, NaN) {
+  whenInputIs(std::numeric_limits<double>::signaling_NaN());
+  outputMustBe("NaN");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, PositiveInfinity) {
+  whenInputIs(std::numeric_limits<double>::infinity());
+  outputMustBe("Infinity");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, NegativeInfinity) {
+  whenInputIs(-std::numeric_limits<double>::infinity());
+  outputMustBe("-Infinity");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, Zero) {
+  whenInputIs(0);
+  outputMustBe("0.00");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, ZeroDigits_Rounding) {
+  whenInputIs(9.5, 0);
+  outputMustBe("10");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, ZeroDigits_NoRounding) {
+  whenInputIs(9.4, 0);
+  outputMustBe("9");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, OneDigit_Rounding) {
+  whenInputIs(9.95, 1);
+  outputMustBe("10.0");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, OneDigit_NoRounding) {
+  whenInputIs(9.94, 1);
+  outputMustBe("9.9");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, TwoDigits_Rounding) {
+  whenInputIs(9.995, 2);
+  outputMustBe("10.00");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, TwoDigits_NoRounding) {
+  whenInputIs(9.994, 2);
+  outputMustBe("9.99");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, ThreeDigits_Rounding) {
+  whenInputIs(9.9995, 3);
+  outputMustBe("10.000");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, ThreeDigits_NoRounding) {
+  whenInputIs(9.9994, 3);
+  outputMustBe("9.999");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, FourDigits_Rounding) {
+  whenInputIs(9.99995, 4);
+  outputMustBe("10.0000");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, FourDigits_NoRounding) {
+  whenInputIs(9.99994, 4);
+  outputMustBe("9.9999");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, FiveDigits_Rounding) {
+  whenInputIs(9.999995, 5);
+  outputMustBe("10.00000");
+}
+
+TEST_F(JsonWriter_WriteFloat_Tests, FiveDigits_NoRounding) {
+  whenInputIs(9.999994, 5);
+  outputMustBe("9.99999");
+}