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libraries/ArduinoJson/extras/tests/JsonDocument/overflowed.cpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2025, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+#include "Allocators.hpp"
+#include "Literals.hpp"
+
+TEST_CASE("JsonDocument::overflowed()") {
+  TimebombAllocator timebomb(10);
+  JsonDocument doc(&timebomb);
+
+  SECTION("returns false on a fresh object") {
+    timebomb.setCountdown(0);
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("returns true after a failed insertion") {
+    timebomb.setCountdown(0);
+    doc.add(0);
+    CHECK(doc.overflowed() == true);
+  }
+
+  SECTION("returns false after successful insertion") {
+    timebomb.setCountdown(2);
+    doc.add(0);
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("returns true after a failed string copy") {
+    timebomb.setCountdown(0);
+    doc.add("example"_s);
+    CHECK(doc.overflowed() == true);
+  }
+
+  SECTION("returns false after a successful string copy") {
+    timebomb.setCountdown(3);
+    doc.add("example"_s);
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("returns true after a failed member add") {
+    timebomb.setCountdown(0);
+    doc["example"] = true;
+    CHECK(doc.overflowed() == true);
+  }
+
+  SECTION("returns true after a failed deserialization") {
+    timebomb.setCountdown(0);
+    deserializeJson(doc, "[1, 2]");
+    CHECK(doc.overflowed() == true);
+  }
+
+  SECTION("returns false after a successful deserialization") {
+    timebomb.setCountdown(3);
+    deserializeJson(doc, "[\"example\"]");
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("returns false after clear()") {
+    timebomb.setCountdown(0);
+    doc.add(0);
+    doc.clear();
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("remains false after shrinkToFit()") {
+    timebomb.setCountdown(2);
+    doc.add(0);
+    timebomb.setCountdown(2);
+    doc.shrinkToFit();
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("remains true after shrinkToFit()") {
+    timebomb.setCountdown(0);
+    doc.add(0);
+    timebomb.setCountdown(2);
+    doc.shrinkToFit();
+    CHECK(doc.overflowed() == true);
+  }
+
+  SECTION("returns false when string length doesn't overflow") {
+    auto maxLength = ArduinoJson::detail::StringNode::maxLength;
+    CHECK(doc.set(std::string(maxLength, 'a')) == true);
+    CHECK(doc.overflowed() == false);
+  }
+
+  SECTION("returns true when string length overflows") {
+    auto maxLength = ArduinoJson::detail::StringNode::maxLength;
+    CHECK(doc.set(std::string(maxLength + 1, 'a')) == false);
+    CHECK(doc.overflowed() == true);
+  }
+}